|Dec 06, 2009, 06:24 PM|
Squary-Bat Micro Depron Combat 30x30cm
Last week I made a small Indoor combat airplane with as idea "Keep it simple"
Pusher props makes a plane very unstable at lower speed. That's why it is in the front.
A few days ago I made the first flight but it was really bad.
CG was way of so the elevator was really really touchy. A bit down input reacts in a 90 degrees angle down.
After some mods today flew it indoor and it flies great and easy. I didn't get it in a stall. Even with fully up elevator and turning small corners.
I have some mods in mind but this one is good enough.
Mods to made. Sleeve in de wing 1cm to the front to get the CG better more easily, some reinforcements on the main skid and something to prevent tipping over.
14gr HXT C1822 BL motor. 10gr HXT 2000kv is more than enough.
6x3 GWS prop
2x 4gr servo
2s240 but 2s360 or 2s460 is also an option.
small 4ch receiver and TX with delta-mix.(ailevon)
AiW 74 gram with this setup. (I recommand 100 grams maximum )
CG @ 7.5 / 8cm of the leading edge.
Leading edge is 3mm carbon tube. If you want you also could put that on the back to safe your controlls with a impact form behind.
Neutral 2mm up.
max. 2.5cm Up.
3 or 4 cm ailerons up/down
Downthrust is zero at the moment but -1 degrees should be better I think.
Here some photo's and a movie.
Also a few sketches.
a few screenshots
"Plan part 1"
"Plan part 2"
For the builders "Have a lot of fun with it"
|Dec 06, 2009, 07:32 PM|
Dennis, That is a really cool design, in fact I have been looking to build a little combat bird like yours. I just ordered a C1822 motor,( there was only two left). Thanks for your great work.
|Dec 09, 2009, 09:05 AM|
6mm is fine. It's a bit havier but you got more stenght instead.
Don't make it too havy. Above 100 grams it will fly with the right motor but it need to go faster and with a crash the impact is greater.
I think the V2 version got two studs at the front. So a 4 point landing gear.
Ground take of is only possible by putting it on his tail and rocket lounge it.
|Dec 23, 2009, 03:52 PM|
Joined Jun 2008
- Nose support removed and added two carbon stings
- cosmetic mod of lateral surfaces
what do you think?
|Dec 23, 2009, 07:02 PM|
Nice mods and drawings.
I think the CF pins break of very easily but my landingsupport is also a problem with hard landings.
Last weekend I tried too stick it to the sealing.
A few times it worked but more the prop hits the sealing and the plane drops like a brick down without engine power.
And I had a (n almost) full speed midair.
See movie. @ 7min36
In part one my x-mas project @2min20
|Dec 24, 2009, 01:50 AM|
Joined Jun 2008
|Dec 24, 2009, 03:26 PM|
Oh btw. Your landing pins ends beyond the CoG so it wil flip over.
CG is around the motormount.
Maybe a half moon all to the front with a gap in it for the prop. I think 6mm depron is better. Or thin CF plate.
|Feb 16, 2010, 03:44 PM|
Today I made V2 for a friend of mine.
This time with mm depron and skits on both sides.
Sleeve in the fron 2cm of the edge instead of 2.5cm.
And cambered the fin a bit at the back so it stays more easy on his tail to make vertical take offs.
Motor mount from two layers 0,33mm CF Not glued yet.
And used a strip of glasfiber tape around the sleeve.
The yellow one above had a lot of prop damage around it at the moment. Tape would prevent that.
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