Latest Posts

Posted on

Timber makes first flight of 2018

Like many clubs, ours has an annual January 1st get together so that we can all get a “first flight of the year”.  This year featured cold temperatures, 3 inches of snow… and did I mention REALLY COLD!

When I got to the field, Mr Steve Kessler was already waiting for another member to arrive so that he would have witness to his first flight… it was about 7:30AM and sunrise was set for about 8:15 so it was just starting to get light.

After we thawed out the lock on the door to the shelter, we fired up the generator, lit the heater and then went out to get in some early morning flying in.

Here’s a compilation of some video from Steve watching me arrive and noting the chilly temp (check out that dash display showing negative temps).  That’s my Timber on the left with the orange wing tip stripes.  Steve had his plane sitting out side while we got the shelter ready and one of his ailerons simply froze up…  So our first flight became a solo.

Flying into the rising sun while it is still just below the horizon is a lot of fun.  As are the floats on the snow.  Better than skis in these soft and fluffy conditions.  

Later on that same day I got out the Traxxas Fiesta AWD and mounted the camera on top for some more video.

It was a bit chilly (what’s -14 when you’re having fun?) but we started the day with a beautiful sunrise and proceeded to enjoy some hot chocolate, cinnamon rolls and a nice warm shelter for between flights!  Later in the day we feasted on some brats and burgers along with baked beans and some tasty baked goods for good measure.  All in all, a great start to the year.  Here’s hoping 2018 ends as well as it began!

 

Posted on

Second E-Ducted Fan… The Phase III Squall

When it rains it pours I guess…  After never having owned a ducted fan of any sort, I now find I have two of them!  I was at a swap meet recently and ran across this gorgeous little plane.

This is the Phase 3 Squall.  This one is the HP version so is ready for a 4 cell LiPo.  With a 3400KV motor and 45A speed control I expect some fairly high speed passes are possible.  I’ve also seen some fairly high alpha passes with the HP on video, probably due to that swept wing and the extra oomph.   They call for 4S 2500mah pack but since I already own some 3300s, you can guess what I’ll fly with for the maiden.

The paint job really caught my eye and I haven’t seen another like it… once I saw the price I was hooked.

I was warned to be cautious with the throws so I followed the manual precisely and put elevator, aileron and rudder on triple rate switches with the low rates being no higher than what is recommended for normal, an in-between step and then the recommended high rates.  I was also generous with the expo as is my standard operating procedure.

I’m hoping for good weather on the 1st when we have our “freeze fly” so I can get a maiden on it… I just got it ready to go today (about a week before) and of course the warm(ish) weather is departing tonight so we’ll have to wait and see.

Posted on

Update to my Dumas Windy air boat is underway… kicking the glow habit.

A couple weeks ago, my only glow powered airplane lost its battle with gravity.  “The Pig” as we called it had seen better days and we think the wing (which had a couple of weak spots) may have just made one to many 8G turns…  It dove hard into the ground and shattered the forward third of the body.  The wing was in 3 pieces as well so not much left to work with.  Nor was I particularly interested in spending a lot of time and money on a truly major rebuild anyway.  There are lots of old beaters around to chase gliders with (it’s main occupation the last several years).  RIP “Pig”. 

Whatever the cause, it meant that I had only one glow powered craft left… my Dumas Windy air boat.  That meant I was now in striking distance of finally getting completely out of the glow business.  No more messy oil coating every surface, eating finishes, staining shoes, etc… etc…  No more obsessively tweaking the needle for that little extra kick.  No more disappointment when the glow driver battery was dead.  No more little slices on my fingers from flipping those insanely sharp composite props.  I can do it!  I can be free!!  Maybe I could even find some poor soul who hasn’t yet tried to kick the habit to unload the remnants of my stash?  Someone who is still completely in the grasp of that cruelest of mistresses…

Glow motor addiction! 

Yep, I recall when I was hooked.  The smell of warm castor and the ear piecing shriek of a 2 stroke at 15,000+ rpm was what I craved.  When I tried to escape I was simply lured in deeper by the mellow tone of a 4 stroke purring away at an idle so low you can practically count the RPMs.  And the price just kept getting higher.  10/15 wasn’t good enough anymore, now I needed 20/20 or better.  The “dealers” kept pushing harder with gold plated (literally) and chromed editions that I simply had to have.

But I’m almost free now.  If I can find a replacement power system for the LA-15 (blue edition of course… I could never stand the cheap stuff…) I could be free.

I quickly realized I already had a possible alternative.  I had recently purchased the remnants of a E-Flite Timber.  The electronics and power system were all intact to all appearances.  So the plan was hatched.  I would transplant the BL10 from the old Timber onto the Windy.

First I stripped the LA-15 from the boat and placed it into my swap meet box.  I only took a quick sniff from the muffler as I polished it up a bit for display… (Don’t judge if you haven’t been there).  Twice it occurred to me how reliable the 15 had been and how well it would pull the half finished little mustang that lay just across the shop but I summoned up my will and closed the lid on the swap meet box firmly.

Once past this job I quickly stripped the on board battery, throttle servo and fuel tank.  After gathering a few supplies at the hardware store I managed to space out the BL10 motor with some nylon spacers, threaded rod (hacked to length) a few washers and some nylon insert nuts.  The firewall looked like it was about ready to give up the fight:

Some medium CA and kicker was employed to solve that issue.

I kept the little 7×4 3 blade prop.  At least for now.  There just isn’t clearance to go to a higher diameter prop and  I haven’t found much else that looks like a good fit, so for now this is it.

A bit of temporary Velcro strapping to temporarily hold the speed controller in place and thing were looking pretty good.

Time for a quick test.  Using a 3S 2700 I measured about 11A and 130W of power draw from the battery.  A quick test on grass confirmed that this is just not the same level of power as the old 15.  I tamped down the temptation to re-install it (I get stronger ever day but the temptation never seems to die!) and did a bit of research .

A couple days later I recalled that some Timber owners had run this motor and speed controller on 4S packs… and with very little difference in prop size they had reported continued health of the power system.  So I decided why not.  This time with a 4S installed the meter showed 270W and 18A of draw!!  I was running this test on carpet and the boat took off across the room when I released it and without even reaching full throttle.  This combination looks good.  This alternative to glow for this boat seems great, no side effects apparent… I might make just make it!

During a final test… just for fun.  I noticed a brief stutter on startup and then again at a higher throttle… I thought the motor was going to shake apart.. what the heck??  Oh well, I guess there are always slips along the way…  Guess I better start researching this new issue…

Posted on

First ever ducted fan electric for me… Alfa F-16C

The RC community is a great resource with worldwide reach and it is fantastic what you can learn and the support you can get just for the asking.  It has always been my hope that something I write here will help out someone else… beyond just entertaining.  Sort of my way of passing it on.  In this case though I got some excellent help from a member of the community who I found on another web site.

Thanks to a posting on the RCGroups web site and a quick response from a gentleman over in England, I now know that what I have here is an Alfa Models F-16C.  Alfa Models appears to be based over in the Czech Republic and available only directly from them at this point.

Someone wanted this one bad enough to order and pay some substantial shipping or perhaps a US vendor carried them for some time??  In any case I now have access to the instructions so I have information on the power systems that are recommended, though I can’t tell whether this one has one of the “stock” options or something else, plus some idea of what size battery to run, where it should be balanced etc…

As I move forward on the build and fly, I will post more here.

Posted on

First ever ducted fan electric for me… whatever it is!

An F-16 finds it way to my hangar

Went to a swap meet on Sunday and along with a few little odds and ends I ended up with this:

I’ve searched on line and can find no mention or image of this little foamy.  I’ve been wanting to try my hand with something a bit faster… If for no other reason than I’ve never flown anything with much speed and my assumption is this will likely fit the bill.  Also, I’ve never flown a ducted fan either so maybe get a couple of firsts in one!

At first glance I thought this would be a pretty plug and play, throw it in the air and go option… but after getting the plane home I’ve found a bit more of a project.

First, I was trying to get the speed controller out where I could get a good look.  Since I can’t find any info on the airplane or it’s power train, I have no way to know what battery it should use, what current it will pull, etc…  I was hoping the speed controller would give me some idea what kind of “not to exceed” numbers to look at.  Here is where the speed controller is buried.

Yep, that’s it way up there in an almost invisible location… sigh.  After pulling one nylon screw to pull out the “scoop” I was able to remove the controller, motor and inadvertently the thrust tube that guides the air stream smoothly  out the tail.   Here’s the speed controller with nary a part number, label or any other identifying mark in sight!

That being no help I looked over the motor and ducted fan unit hoping for some help but as you can see it was not much more illuminating.

I eventually took out the guide tube as well…

…and cleaned up all the parts, scraping off excess glue in some areas, re-gluing others etc…  In the process I found some suspect wiring that I intend to replace and clean up, extending some wiring a bit so that the speed controller is bit more accessible!

Here’s the wiring that needs some work.

Here you can see the access points I had to open up to get the thrust tube back in place.  You can also see the one issue I had known about… the aileron control horns seem to be missing!

 

After all that I decided to do a test run just based on size and best guesses so I tossed a 3S on the speed controller, pulled the power pin from the ESC to the servo tester and laid it out on the table top…

The initial run was promising with ear splitting, vacuum cleaner on crack sounding rpms.   That IS what an electric ducted fan is supposed to sound like, right?

After I rework that wiring a bit, next on the hit parade is to put my meter in line and measure current draw at full throttle as another data point toward picking the right battery.  Then I can get back to reassembly and installing some replacement control surface horns.

Then maybe estimating some sort of balance point/CG and installing a receiver and radio setup… This thing is practically bind and fly, right?

Posted on

Gary’s Hangar Nine Corsair with Evolution 777

Recently visited one of the “Garys'” to make a stab at getting his Evolution 777 4 stroke, radial, 7 cylinder motor to run at other than 20-35% throttle settings.  Previously that was the “best” we could get.

But today, here is what we got to…

 

https://youtu.be/G79xyCGJb-M

 

This is a much superior result.  So what was holding it back?  On the previous runs we had been running some older fuel and also been advised that we needed to open up the high speed needle a bit… but undoubtedly the key factor had to be the replacement of all 7 glow plugs!

A bit of overthinking (perhaps) had led someone to decide that the brand new plugs in the motor needed replaced before the first test run.  And someone else advised that the OS #8 was the best plug for ALL glow motors!  Perhaps that statement might have been a bit… overstated!?

While I agree that the OS#8 has long been one of the best all around plugs for a large majority of smaller displacement 2 stroke glow motors, there are also reasons that manufacturers recommend hotter plugs, colder plugs and very pertinent here… specialized 4 stroke plugs for some motors.  So by moving back to the provided 4 stroke plugs, fresh mixed fuel and some judicious tweaking of the needles per instructions from the support folks at Horizon Hobby… and we are now officially into the break-in process!

This Corsair might actually get off the ground… eventually!

Posted on

Tugster Tug Boat kit by ZippKits.com

During our sojourn to Toledo, Ohio for the annual weak signals show many of us picked up some new toys.  One of the items that found its way home with us was the ZippKits “Tugster” tug boat kit, purchased by my friend Steve.  He had the idea of building up the Tugster for use in aircraft retrieval.

Now, about 6 months later, the little tug boat has been assembled and prettied up for its big debut.  I think Steve put it all together in just the last couple weeks.  Here is the big launch.

From Steve’s description, the little tug went together quickly and fairly easily. And it appears to have good power!

Steve also reported that the Hardware Kit was quite complete and had pretty much everything needed minus the radio system (receiver and transmitter needed).

Here is a side by side with my Timber out on her floats for the first time.

The little boat seems to have quite a bit of power.  Certainly it easily shoved the Timber around!  The supplied batteries (2 x 6V 4.5AH batteries) needed only 450mah to recharge to full after out poking around at the pond for the better part of an hour the other night so it is hard to imagine recharge being needed during a day at the lake.

The Tugster may see some action here in a couple days as we have our club float fly this weekend.  We’ll see how she does as a real work boat.

Posted on

Telemaster 40 becomes glider tug

I recently installed a glider tow release into my Telemaster 40.  Partly I did this because I could and partly it was because I have a couple of fellow RC club members who own gliders that I have towed up before and I sold the old tow plane (the Carbon Cub) so felt like I needed to have a replacement.  The Telemaster sports an Electrifly .80 motor along with a Talon 90 speed controller.  This combo, powered by a 6S battery (usually a 4000 but now frequently a 4500mah) has a lot of pull to spare.  The Telemaster only weighs about 5.5 lbs ready to fly so pulling a couple pounds of glider is fairly effortless.

I found a nice release to use and with a little surgery it was firmly ensconced in my airplane.  Here are a few pics of the install.  

Here’s the unit I purchased.  This one is made by TopModel and is very stout but not extremely heavy.

I want to install it just ahead of this bulkhead near the trailing edge of the wing

To do that requires access to the other side so cut open the bottom…

Mounting it requires getting  a good grip on the nuts on the far side so forceps to the rescue!

 

And the construction of a tray for the servo to run the thing.

In my case I mounted this tray across the body with the servo shaft pointed toward the rear of the plane to give a nice straight up shot through the release.

Once the release is mounted, install the servo “tray” and cut the rod to length.

With a little radio magic, assigning a channel to a switch, setting endpoints etc… and you are all set.

Aside from getting access to mount it, nothing really difficult about the process.  It was easier to mount it just forward of the bulkhead near the trailing edge of the wing than to build out a bunch of new structure so that’s what I did.  It did necessitate notching into the trailing wing edge right at the root, but on this aircraft that is simple enough.   I was a bit concerned about whether it would hold up but based on this video it looks like we are in business.

 

https://youtu.be/fWAyZZC7gTA

 

As you can see, no all glider tows go smoothly.  One of the two KA-8s I was towing had some pretty nasty habits when in tow.  We are investigating but we are pretty sure either the wing or tail incidence is off or even variable due to damaged mounting hardware at the back of the wing.  It does make for some “exciting” flights for all concerned!!

I’m looking forward to more glider towing.  Using an electric plane makes this even easier as the preparation between flights is simple and while you are hooking up etc… you are burning very little “fuel” so more tows between “fuel stops”.  All in all this has been a success so far and I’m hoping for better tows in the future as both I and the glider pilots get more experience.  The tow release is working like a charm so far and I would certainly recommend it to anyone who wants to get into this facet of the hobby.

Posted on

Flying the E-Flite Timber

I have been putting the majority of my flights lately on my E-Flite Timber.  It’s a rare trip to the field where I don’t run 4 or 5 batteries through it and some days I may do 10… especially on days when I just want to relax and not spend a lot of time assembling or hauling out the larger/more complicated stuff.

The airplane is just fun if you enjoy STOL and just slow relaxed flight as well as being a fair platform for basic loops, rolls, and other basic aerobatic maneuvers.  Since I added the multi-connex (see this article for details on those) to make it a two plug operation to connect the wing, getting it up and running is quick and easy.

Here is a video compilation of Timber flights to give you an idea of the flight envelope.  This includes looking forward/backward and out over the starboard wing over the course of several flights.

I have read thousands of posts outlining all the things that are “wrong” with the Timber and warning of dire consequences if you don’t “fix” the aircraft immediately upon assembling it.  For the most part, in my experience (we have 5 of these at our club right now) if you simply follow directions and assemble the plane according to directions it will fly wonderfully!  Even the battery tray favored by some, I find to be unnecessary and possibly even inconvenient/limiting as the battery compartment isn’t overly large to start with and this just uses up more room!  Loved that same concept in my Carbon Cub but not for me on this one.

There are a very few things that I would recommend doing to make things easier or avoid issues…  

  1.  The only critical issue I’d be concerned with is to check the prop balance.  Most will never have an issue if they don’t do this but I’m sure there are some that the prop is so badly out of balance that the airplane will destroy itself due to vibration.  If you run the motor and hear a lot of vibration noises… balance the prop.
  2. Do something (lots of choices) to make taking the wings on and off a bit easier like the connectors I mentioned earlier.  Some folks keep the wires attached and build holders that allow for easy transport in that mode.  Some don’t mind the wires as is.
  3. I did a wax job on my plane using floor wax.  This is excellent for keeping the plane clean and protecting the finish.  Not a necessity but helps with longevity.  I have an article on this here.
  4. Take the screws for the float pull-pull connections and hide them somewhere as soon as you find them.  They have a habit of disappearing, especially if stored on the airplane when not being used!
  5. Finally, I did not even try using the floats with the standard rudder linkage.   I had a similar setup on a previous plane and found both the “fishing line” pull system and the spring return to be problematic at best.  I removed one rudder and rigged the other for pull-pull using standard pull-pull braided cable just as I did on the previous plane.  If you want to read about that modification on the other plane you can find it here.

That’s about it. 

I fly mine without the optional slats right now… though I may add them later and really wish they were removable (sigh).  Reports vary widely but on a good 2200mah 3S, I average about 6 minute flights with 30-40% left in the battery at landing.  You can burn up a battery in 4 minutes on lots of throttle or you can coax it closer to 8 minutes if you are gentle… I’m measuring time spent above 20% throttle so actual flight time is usually a couple minutes longer.

In closing, this is quickly becoming my go to flyer for quick and easy flight.  It has a fairly wide flight envelope, is easy to assemble and transport and with the lights and floats, very versatile.  It may take the place of my Parkzone T28 as my “gotta have one” foamy.  Get one soon!

I will do another article soon on the SAFE and AS3X modes of this airplane and its included receiver.  For now I wouldn’t let that get in the way if you are interested in this airplane.  It won’t hurt you and it may be just what you’ve been looking for.  If you want to put your own receiver in it or turn all that off, that is possible as well and the plane flies well without it too!

 

Posted on

Extreme Flight Laser 200 – Prop choices… Solved

After considering my options for  awhile I finally decided that I was not willing to continue to run my Laser’s power system with the Castle speed controller reporting the FET hitting 180 degrees or so and the total wattage showing peaks near 4100 watts from a system designed for 3500.  Castle advised that the speed controller might shut down around the 210 degree point so I have a little margin to work with but pulling a bit less power would hopefully cool things down, plus bring that top wattage down a bit which would hopefully also translate to a little more flight time and less strain on the batteries so…

First step was to hopefully reroute and improve airflow a bit.  The motor box in the Laser is as much open space as structure so there is a lot of air passing through over the batteries directly from the cowl openings to each side of the nose cone… but below where the speed controller sits may not be getting as much since it is not “in line” with those openings.  To help with this I taped off  the side openings of the motor box to hopefully force more air to pass underneath and over the heat sink of the speed controller.  I also re-routed my battery tie downs (Velcro strips) so that they were not covering any of the fins.

This seemed to have negligible impact so I decided the next logical step was to reduce prop load slightly.  The 22×8 flew awesome but the 20×8 dropped the speed controller temp by 50 degrees or so and the bird still had good power and dropped the battery draw markedly.  But of course I wanted more power!  The only place to go was in between and having already bought 4 props I decided it was time to do some “custom” trimming.

I first marked the tips of the 22×8 about a half inch off of each and then powered up the desktop sander and started making the new 21×8 custom Xoar prop.  I tried to maintain the basic tip shape and hand sanded the last bits to round edges and smooth things up.  I then applied some clear finger nail polish a sealer to the bare wood.

After a little drying time, I put the prop on the balancer and did a quick balance job and then bolted it back on.  Here is a before and after sample of flight data showing wattage, amps and temperature of the speed controller.  First the 22×8 stock prop.

You can see the temp of the FET nears 180 degrees (the gray line) and the wattage peaks over 4100 watts (the red line).  Note the current at almost 96 amps.

And now with the modified prop…

In this graph the temp peaks at just over 155 degrees Fahrenheit (gray) and the wattage now peaks at about 3800 very briefly (the red line).   Amps drawn peak around 86 (in yellow).

Even dropping back on power a bit, the plane has huge power… straight up snaps?  No problem.  Knife edge loops?  Sure!  Straight up out of a hover?  Piece of cake.  So I think this is it.  The prop of choice will be a Xoar 21×8, either cut down from a 22×8 or direct from the factory.

Now I can concentrate on airplane setup including battery position for best balance, mixing needed, etc…  Now I just need about 50 flights !

Proudly powered by WordPress