Where to find 3D plans/drawings for Edge 540 or Yak 54

[jak]

Hi Guys
I have decided to go for a scratch build next time. Does anybody know where i can find 3D plans or drawings for a Edge 540 or Yak 54.
The size I´m planning to build is 28-30%. I have done many modells like this before but they have all been a lot smaller. So therefor a questione to follow. Any idea about the relationship between fullsize and 1/3 scale. Does any part/s need to bee adjusted in size (like the tailplane) or can you just take all the measures and scale them down to the wanted size?

[Boulder]

I moved your post to this forum, I think you will get a lot more exposure here.

As for your question, I know you can't take the plans for a smaller plane and just increase the size of the structural members to scale, the loads are much higher in the larger airframe.

As for taking full scale plans and sizing them down, the flight characteristics that we want in our planes are different than what can be expected from a full scale aerobat, hence the design changes to the scale model. There are many on here than can give much better insight than I can.

Good luck and please keep us informed!!

[jak]

OK guys.
There hasn't been much response to this thread what so ever.
So I desided to build from a small 3 view drawing of an extra 300 full size I found somewhere on the web. the result is what you can see. Foam wings planked with abachi wood 1mm and coverd with 20gr fibreglas. The fuse is 4mm boatply with a lot of foam around and covered with 200gr fibreglas. It took me 100h + to do it. and everything was straight an nice. The total weight was just under 8 kg. 28% with a DA50 in the nose.
I whent out one evening and run the eng. and made some 5-10 high speeg taxies and some short jumps. It was handling very well and I was really exited to to get it in the air.
The next day I was at the airfield in Barkarby in stockholm and cranked it up. Gave it 1/2 throttle and of it went. Wow it felt very light and had a lot of excess pwr. I flew 5-6 sircuits and landed again. Up and few more turns I gave it a little moore, then I notised it didn't like big elevator throws. In a turn with a little higher speed at 90 dgr bank when I gave it elevator for a sharp turn it made 3/4 of a snaproll and came out inverted. Puh! that was scary. I made some high fly bys with very low speed to try the stall caracteristics. That wasn't nice. It constantly wanted to snap to either one side. Bad!
I put on some extra weight in the front to adjust the C/G. I used a wrech key (aprox 400gr) and some straps to get it on the eng. mount. Away again. But the tendencies were still there.
made a few more circuits and a long downwind for a landing. When turning base I were a little to low on speed and it stalled with a 3/4 snap thing as result and I weren't able to recover before mother earth eat it.
The whole front and one wing panel were history.
I have a theory and that is the wing profile. It's like round like a ball in the leading edge and from there on two staight lines that meet in the trailing edge. I'm not a rocket cientist but that was the profile on the plan and it looked nice so I went for it.
Maybe I have to buy something decent, alredy tried out next time.

Kent

[jak]

Well the good thing about this is that I didn't waste any paint and hopefully learned something.
I have been following a thread here about an Yak 54 28% from rcleague. It looks OK and comes for a decent price too! I'm right now haveing a mailconversation with Mr Lee and hopefully I'll have something to fly this summer. I wish we in scandinavia had summers like You guys in south US (except the storms thou) and prices like in Your model stores.
Kent

[nwcamp]

I am also looking for 3D plans. Would buy a crashed 1.20 or about size 3D to get the design features.

[Javier Marquez]

Hello Everyone:

Have you tried Bob Banka's Scale Aircraft Documentation (bobsairdoc.com)? I had the same idea a few years ago and he sent me a host of 3-view drawings for the EDGE 540, from which a decent model can be made. Also, as far as the EDGE is concerned, if you go to the ZIVKO website, there's a very good drawing of the 540 on the site which you can copy directly into a CAD program. You'd have to fill in the shapes for bulk heads, cowling contours, ribs and so on but those can be done using the drawings supplied by Bob Banka. In any case these are pretty simple; no strange curves or any such thing.

I finally gave up on the project because of what someone above said. Namely, you have to modify the full scale for model purposes, to get it to fly like a good 3der etc. Actually, the little EDGE made by Stevens Aero Model (50" wing span for a Hacker A30-16M on 3S LIPO's) is very close to scale and though it flies very well, it is not as good as a purposely 3D modified EDGE. On the larger side, I personally have the Hangar9 (33%) and a Wild Hare (28%) and both fly very very well. I love them both.

Hope this helps you on this project, and I'd be very interested to see what you come up with.

[Javier Marquez]

Here's the drawing from the ZIVKO website.

[alec taylor]

on my 3 rd 45% edge drew my own plans onto building table. used wing section off the comp 260. alex