FlyingGiants - View Single Post - Where to find 3D plans/drawings for Edge 540 or Yak 54

jak · 05-02-2007, 04:42 PM

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

05-02-2007, 04:42 PM	#3
jak Flyin' Around Join Date: May 2006 Location: sweden Age: 43 Posts: 8	Re: Where to find 3D plans/drawings for Edge 540 or Yak 54 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 Attached Thumbnails 1.06 MB · Views: 589 1.10 MB · Views: 390 1.22 MB · Views: 409 Last edited by jak; 06-15-2008 at 06:16 AM.