Makeing my first plane..  
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Makeing my first plane.. - 3/30/2005 11:10:33 PM   
ziomatrixacs


 

Posts: 165
Joined: 4/25/2003
From: Over there., OH, USA
Status: offline 		Alright I have built 1 other plane and I have never flowen a real kit or arf plane. (Im poor) I have a 3 cell lipo a CHEAP I mean C-H-E-A-P-O ducted fan 2 micro servos a radio and an ESC. The plane I built works fine as an unpowered glider but once I added my equipment I ended up with a broken wing. (Snapped off inflight..litteraly) and a bug in my eye.

My ducted fan is only 2inchs wide with one of those toy car motors that are rectangular. Theres 3 blade but they are 1x1 cm.

I am not asking for plans, I just want a few pointers to get a simple airplane that works. HopefullyI can save a few bucks and buy a real ducted fan. (I chose ducts because theres no props to break and its finger safe)
My old plane was 50inchs long and was 36 wide. The wing was 9 inchs long and about an inch tall. The wings leading edge was located 36inchs from the back of the elevator. The elevator was 18 x4 inchs and there are two 4x5 inch rudders on the sides. (Looks like an A-10) the elevator was a flat bass wood fin. The alierons had 1 micro servo and they were the lenght of the wing by 1inch. Since im a poor man I used window covering and clear plastic tape to cover my wings.
I had to add about a half pound of wood the to the front to give it enough momentum. (it fliped head over tail before)
I do not think my duct was strong enough and when I tossed it down the hill it would not pull up for crap. It got stuck about 10 inchs deep in mud.
Sorry for any misspells. I currently have a bug floating in my eye.
Please help me!

_____________________________

Run.
       Post #: 1

RE: Makeing my first plane.. - 3/31/2005 1:40:31 AM   
AStrovannin



Posts: 65
Joined: 2/18/2005
From: Long Sault, ON, CANADA
Status: offline 		Heres my input, take like $35 and buy some balsa, print the palns from BipeFliers 1/2A (check the 1/2A forums for the 1/2A trainer)website. Work on puting that together, save a few dolars while you are building and when you get to it, buy some proper servos, you can get em real cheap on the bay, like $8.50 each. Then get those in there, then I would put up a post on the "pay it forward" thread and say that you have built your model and have the servos and you need a radio and engine. Seems to me that somone would be more than willing to help you out there, since you will have already showed enough comitment to build the model from scratch. I'm sure that will work better than trying to build somthing out of nothing.

(in reply to ziomatrixacs)
       Post #: 2

RE: Makeing my first plane.. - 3/31/2005 4:23:29 AM   
BMatthews



Posts: 8895
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		I'm afraid he's pretty much right zio'. Ducted fans are known for their scale like looks but poor efficiency. Even if you stick with the electric option I strongly recomend going for a motor and prop. Or preferably a gear drive motor and prop. They just work so much better at lower speeds. Learn not to put your fingers in the way.

Your description of the old model is not really regular to say the least. But I think you mean that the SPAN of the wings from tip to tip is 50 inches and the fuselage is 36 inches long. If it's the other way around and the SPAN is 36 with a 50 inch long fuselage then that's a rather odd design unless it's sort of a semi scale jet fighter model. It's also WAY TOO MUCH model for that little ducted fan unit and would be for any of the smaller ones I know of.

The fact that your wing snapped in flight just from the radio gear load and perhaps some previous test glide damage suggests that you need to learn a bit more about structural design. I suggest you download all the free plans you can find on the web and study the structural details to get a better feel of what will work and what will not. There's a fair number of smaller plans free for downloading in the Free Plans Download Links thread at the top of the topic listing in this forum. Check 'em out. I've also seen some simple parkflyer electric plans on the net but didn't save the links. Use www.google.com to search for them using the key words "free plans download" without the quotes. Some pages will sow directly and others will have links from still yet further pages. Follow them and get all you can find. Studying these plans regardless of size is the best way to learn what looks right and what works.

Put the ducted fan gizmo away for now and get a GWS EPS motor and gearbox plus prop or two that is compatible with your Lipo pack. Your chances of success will be much higher with one of those in the front of your next model.

If you reply with the size of your LiPo pack and the max continuous current it'll supply we can suggest a motor and model design.


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to AStrovannin)
       Post #: 3

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