|Aug 04, 2011, 07:30 AM|
Not really a build log as for pictures, since this was a concept build but I'd like to share some pictures of the plane as it is now and a description of how I built this jet.
Firstly, the plans come from the Pusher Jet section and this is a plan made by Mr. Ud. His thread can be found here.
The jet is 39cm wingspan without winglets. Electrics are all from the J-power F-86 Sabre. A 2S 350mA battery is used. The servos, ESC and RX all fit under the turtledeck.
I used mainly 3 and 6 mm depron but the turtledeck is made from 2mm.
3 mm Depron is used for the "base plate" which is the wing, tailplanes and forward nose section. Next time I would try to make this base plate from one piece. In the plan this baseplate is made from several parts, which isn't necessary.
The vertical fin is from 3 mm too, including the sides of the nose which goes in the fuselage partly, too.
6 mm depron for the sides of the actual fuselage where the EDF goes in and the belly of the jet, for sanding purposes.
Styrofoam for the tailsection (see pictures).
I made a 6mm former in the location where I thought the EDF would sit best (smallest angle to intake and outlet).
Ducting is made from four pieces of 80gr. paper which seemed simplest and adequate for this build. Nothing special here, my main inspiration came from the forums here. This part of the conversion was actually really easy! Needed to cut a bit of the baseplate to fit the EDF in height since the intake lips make the EDF quite larger.
I flew it today with too much wind. CG was too much forward so I tried to get the battery as much to the rear as possible. Still still didn't really solve the problem so a bit of up trim was used, I wanted to get this thing in the air
Flew nice with and AUW of ~78 grams. 54 for the jet, 24 for the 2S batt. Had power to spare and cruised at a lower throttle setting than the Sabre.
Due to my mistake (CG and too little throw on the elevator) it ended up in a tree, fell out and broke the nosecone. Luckily!
I might rebuild this jet, I learned alot since this is my first EDF jet from plans, which is quite different than prop planes.
If someone's interested in building this jet from Ud's plans I'd like to know. There's more to share on this build but it's already a long post
ImagesView all Images in thread
|Aug 04, 2011, 09:11 AM|
I'm kind of doubting though since I really like the A7 Corsair and would like to try that one too. But first, let's see how it flies with the CG a bite more to the rear
Question here though (NC), the A7 I modelled in Rhino (CAD) is 55 cm long, 46 cm span.
Weight according to depron 3mm density and the model's volume the weight of the fuselage is quite low (also due to planned building technique by Harpeye). AUW approx. 70-80 grams too. Would this work, considering the long ducting? I'd put the EDF approx. 10cm from the actual outlet.
You guys have this too? Partly finishing one project and immediatly having the urge to go for something other/ different?
|Aug 04, 2011, 10:45 AM|
I've been wanting to build a Yak 130 for a long time. I saw Mr. Ud's thread also. I may try it now since your looks so good. How do you like the 35mm jet overall. Since the Yak 130 is a twin, how did you route the exhaust, did you use ducting or just allow it to freely exit both sides? BTW, I quickly change to other projects also. It helps keep the frustration level to an absolute minimum
|Aug 04, 2011, 05:24 PM|
What fan size is the A7 planned for?
The long ducting is fine. Place the motor behind the wing so the lipo can sit in the cockpit area..
My wife thinks I have ADD(Attention deficit disorder) the way I bounce from one thing to another. She thinks I lack focus, whereas I just want to do so many things the moment I think of them. Time is always the problem for me
|Aug 04, 2011, 08:04 PM|
Mutt, I simply used 4 pieces of paper. Left / right in front and rear. Each piece touches the EDF, bottom and base plate and lastly the side. I can upload a picture of the template I used on Saturday. Alas, I don't have a pic of my internal setup.. I wanted to find out if the EDF would fit in the first place.
NC, 35mm fan. This one to be more exact.
I hope more people start with this jet. It's not a common one on the field (yet). It looks even better in real life.
|Jul 09, 2013, 07:44 PM|
Get the ducting right. I am sure I lost much potential there. Maybe reduce fan size and go for a twin?
Also, make sure you have enough elevator surface. Go for it, it's a relatively easy build
|Thread||Thread Starter||Forum||Replies||Last Post|
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