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Building a Dynaflite Super Decathlon

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Old 08-24-2005, 04:40 PM
  #251
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Default RE: Building a Dynaflite Super Decathlon

Hi Ed

I did my first towings. I towed a 1/3 scale Polish glider Orlik. 4.5m of wingspan and 7.5kg weight (the red one on the picture below. the blue one is 1/2 scale with 7.5m of wingspan and 26kg of weight).

With zdz-40 and 20x8 prop my Decathlon pulled it without problems.
Just before towing in trial flight with bigger prop I did a ... torque roll
Really.



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Old 08-30-2005, 11:08 PM
  #252
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Default RE: Building a Dynaflite Super Decathlon

Marek,

Congratulations on your first towing with you super Decathlon.

I recently had some extra funds to go and get some more items for my plane. I have been busy with another project that I just recently completed. I took a stock Park Zone Flyers P-51 mustang and put a 480 multiplex brushless motor, 40amp speed controller, micro receiver and servos by Futaba, and a 7.4v 1500maH Lipo battery. This thing screams through the air.

Anyway here are some photos of what I have been doing. The wheel pants took a while to do cause I only messed with them maybe 10min at a time. I have three metal gear high torque servos pulling 107oz of torque. plenty enough for this plane. I also installed 65oz torque servos for the ailerons. I had to mount the rudder servo on a higher rail to allow for the arms to rotate in such a small space, and I got my tail wheel assembly from dave patrick models.
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Old 09-14-2005, 07:01 PM
  #253
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Default RE: Building a Dynaflite Super Decathlon

Great build guys....

I just ordered the dynaflight kit...And was wondering...

Has anyone tried a Zenoah g26 with this kit? Our local field has cubic inch restrictions, and I was wondering if this would be enough of a powerplant.
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Old 09-15-2005, 03:04 AM
  #254
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Default RE: Building a Dynaflite Super Decathlon


Quote:
ORIGINAL: t_josef

Our local field has cubic inch restrictions,
lol, why?
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Old 09-15-2005, 05:08 AM
  #255
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Default RE: Building a Dynaflite Super Decathlon

Quote:
ORIGINAL: t_josef

Great build guys....

I just ordered the dynaflight kit...And was wondering...

Has anyone tried a Zenoah g26 with this kit? Our local field has cubic inch restrictions, and I was wondering if this would be enough of a powerplant.
Hi

I'm sure it will be enough.
Manufacturer say's: 25-35ccm gas engine.
I've a 40ccm ZDZ in my Decathlon, which has plenty of power. I did a torque roll with 20x8 prop, so 26ccm should be ok for sport flying.
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Old 09-15-2005, 06:36 AM
  #256
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Default RE: Building a Dynaflite Super Decathlon

t josef,

The G-26 will be fine. Spend as much time as you can working the tail weight down. The G-26 will not be enough nose weight to get it balanced. With that engine, the lighter the better, which means minimum ballast. I didn't do this and ended up with ballast on the nose with my Quadra 42.

Have fun!

Bedford
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Old 09-15-2005, 08:04 AM
  #257
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Default RE: Building a Dynaflite Super Decathlon

Quote:
ORIGINAL: beepee
I didn't do this and ended up with ballast on the nose with my Quadra 42.
Have fun!
Bedford
Bedford,

what is final weight of your Decathlon and what is weight of Quadra engine?
My zdz has 1.5kg with Supersonic pitts muffler and balanced perfectly without lead.
It's a bit shorter than Quadra, so maybe there was an advantage of engine more in the front in case of my Decathlon? I had to install it on additional spacers.
I didn't weighted my Decathlon, so I don't know his weight yet. I think it's no more than 7kg
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Old 09-20-2005, 07:17 AM
  #258
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Default RE: Building a Dynaflite Super Decathlon

Marek,

I don't remember if I have weighed the Q42, but I would guess it is somewhere in the area of 2 kg. The airplane weighs somewhere around 7.6 kg. I might have done better, but during construction I expected it would end up nose heavy, which is my usual result. Boy, was I wrong.

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Old 10-04-2005, 04:13 PM
  #259
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Default RE: Building a Dynaflite Super Decathlon

This may have been asked earlier in the thread but I didn't see it. I wondered if a Fuji 50 EI would fit under the hood without butchering the cowl. I have an opportunity to get one at a good price however I think this may be too big for this application. The ZDZ40 is probably the ticket but the Fuji 50 can be bought at about $100 discount from a friend of my daughter's so I felt it was definitely worth considering. If not I'll save it for another project and go with a ZDZ.

Thanks in advance fo your opinions whether positive or negative.
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Old 10-04-2005, 04:29 PM
  #260
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Default RE: Building a Dynaflite Super Decathlon

Hi Bill

Finally I checked weight of mine (without fuel). It's exactly 7.4kg (16.3 lbs).
Regarding engine.
Even ZDZ-40 sticks a little over engine cowl.
It's installed up side-down.
Therer is spark plug cap sticking outside.
Someone here has a Decathlon with US, Fuji or ZG engine. If I remember, there was not too much out of engine cowl.
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Old 10-05-2005, 10:43 AM
  #261
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Default RE: Building a Dynaflite Super Decathlon

Thanks Marek,
After going through this thread and seeing how you did yours, I think I'll duplicate your mounting technique and go with a ZDZ40. I may get a Christen Eagle and put the Fuji 50 on it. I really admire your set up and hope that I can build one that looks half as good as yours and cruzmissile's.
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Old 10-05-2005, 11:20 AM
  #262
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Default RE: Building a Dynaflite Super Decathlon

Hi Bill

haha, thanks
In fact, it doesn't look too good in a close view (not fully finished cockpit, no rivetts, etc.)
If you stay with zdz I can help you with dimensions etc.

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Old 10-07-2005, 10:28 AM
  #263
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Default RE: Building a Dynaflite Super Decathlon

Thanks Marek,

It will be during the winter along with some other projects I'm working on. I saved your call sign in my address book. I'll PM you when I start it. I will also continue to monitor this thread for further updates and mods. that everyone posts.
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Old 10-24-2005, 12:04 PM
  #264
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Default RE: Building a Dynaflite Super Decathlon

Why did you "regret" the Midwest Citabria kit? Is there a big difference between the two? I've got a buddy who's been trying to get me to buy his Midwest Citabria. He's just not into large airplanes. He wants about $150 for it. The same price basically as the Dynaflite Decathlon.

Scott
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Old 11-02-2005, 01:18 AM
  #265
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Default RE: Building a Dynaflite Super Decathlon

Struts

I am looking for a clever (Not necessarily scale detail) way to build the struts and make them easily removable. I am thinking of a safety fastener (I got one from home depot).

Has any one tried that?

Thanks in advance

TJ
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Old 11-06-2005, 12:31 AM
  #266
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Default RE: Building a Dynaflite Super Decathlon

Cruzmissile tried to build a scale struts. It's especially ease, because these struts are decorative only. It can fly without them.
I used "factory" method to make struts in mine.

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Old 11-21-2005, 04:19 PM
  #267
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Default RE: Building a Dynaflite Super Decathlon

Wonderful posts guys. I'm a newcomer still, so the tips here are great. I love the kit, but I'm doing a "stock build." I'm not going way out on the scale details because I'm still learning. What I would like to know is how to lighten the tail. I build it as shown, but are there ways to trim back? I want to use flying wires, and I want them to be good looking, but light. My engine will be the Saito 1.82 twin. I know I will have to modify the cowl slightly, but I'm ok with that. It is around 40oz, so my question is what can I do to lighten the tail, so less ballast is needed forward. I want make the most of the power I'll have and not use it up pulling aroung counterweight. Someone on this post hit the low 16lb weight. What are the secrets? Other than moving the servo tray forward, which is already cemented in place, can I make move the battery pack forward, to some kind of custom mounting? My fuse is all framed up (minus the front deck and covering) so I can still make changes.
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Old 12-10-2005, 02:59 PM
  #268
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Default RE: Building a Dynaflite Super Decathlon

Hello guys,
Heres mine. Has a Brison 2.4, smoker and Airtronics radio.
I didn't have the cowl or wheelpants done when this was taken.
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Old 12-10-2005, 03:01 PM
  #269
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whoops, should have downsized....sorry.
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Old 12-11-2005, 07:40 AM
  #270
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Default RE: Building a Dynaflite Super Decathlon

Looks really nice!
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Old 12-16-2005, 11:13 AM
  #271
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Excellent work hy flyer
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Old 12-19-2005, 09:36 AM
  #272
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Default RE: Building a Dynaflite Super Decathlon

I had a little time to work on my plane this past weekend. I have one wing section completed ~ along with the tail. I'm sure the left side will assemble quicker now that I'm familiar with it. (Big thanks to all that posted pictures...you all helped me (unknowingly) a great deal.)

I decided on a MVVS 2.15 for power. ~ It is sitting on the shelf waiting for a home.
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Old 01-03-2006, 10:26 PM
  #273
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Default RE: Building a Dynaflite Super Decathlon

Hey guys... Great thread. i have started building a SD lately and thought I would tag my question on to this thread as it has been a great help to me!

I am about half way done with one wing and I am a little baffeled about the trailing edge. Unless I am missing something (the directions are pretty bad in this kit unfortunately), the trailing edge appears to be made simply by joining the sheeting together to meet the curve of the ribs. This however will leave a gap in the TE creating (what I presume to be) a week spot.

What are your thoughts on this? Am I missing a step somewhere? Is there a piece of balsa that is supposed to create the TE and then sheeted over? If not, did anyone re-enforce this area of the wing?

Cheers,

Scott
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Old 01-04-2006, 07:23 AM
  #274
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Default RE: Building a Dynaflite Super Decathlon

Scott,

I can only go by memory, but others may jump in that have ready access to the plans/instructions. Look at the cross section view of the wing on the plans. The sheeting extends past the ribs. After installing the first side (whether top or bottom), sand it down to match the ribs. The other side sheet should then lay nicely on the ribs and have a good mating surface on the opposite sheeting. This will create a good strong trailing edge.

If that doesn't make it clear (I am not the best at describing visuals), send me a PM with your email address and I will return some sketches.

Good bird, have fun!

Bedford
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Old 01-04-2006, 08:40 AM
  #275
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Default RE: Building a Dynaflite Super Decathlon

Scottpuck,

Look at the plans again, I think you are misreading them. Beepee is correct, the top and bottom trailing edge sheeting meets back behind the ribs. The instructions are pretty clear about this step.
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