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Re: Flight Times

Posted: February 18th, 2010, 2:26 pm
by jander14indoor
Ding, ding, ding, you PASS THE TEST!

er,

uh,

or maybe I made a boo, boo.


Naaaahhh, it was a test, that's the ticket, a test. That's my story and I'm sticking to it.

And glad I could help. Hitting weight is EASY with a good BOM.

Jeff Anderson
Livonia, MI

Re: Flight Times

Posted: February 20th, 2010, 10:11 am
by planemaker
Hi
im using a freedom flight model kit
getting 45 seconds with 500 winds???
Very bad covering
Should i try to put more winds in and see what happens or build another wing???

Re: Flight Times

Posted: February 20th, 2010, 10:38 am
by blue cobra
planemaker wrote:Hi
im using a freedom flight model kit
getting 45 seconds with 500 winds???
Very bad covering
Should i try to put more winds in and see what happens or build another wing???
We need to know what size rubber you are using. But any rubber of appropriate size for an Ikara prop should take well over 500 winds (assuming you meant 500 winds on the rubber, not 500 turns of the winder).

What do you mean by bad covering? As I understand the Freedom Flight kits include Mylar, which is a good covering, so did you use something else, or did you mean you didn't put it on very well?

It sounds like you're new, so I would say the first thing to do is to weigh the plane. You need to get near 7g to be competitive. If you are significantly overweight, your plane can not fly well. Next, lube your rubber (with Armor All original formula, for example. Look in the Rubber thread) and put in way more winds. I easily get 1350 winds into 0.090" rubber, and I think you could probably get even more in. Then trim and fly. As I understand the Freedom Flight kit has a 15cm chord wing and laser cut ribs, so unless you had poor craftsmanship I don't think the wing is to blame.

Others may be able to lend more assistance, but I hope I could help.

Re: Flight Times

Posted: February 20th, 2010, 11:33 am
by leetx
jander14indoor wrote:Ding, ding, ding, you PASS THE TEST!
Yeah, I passed the test!

Re: Flight Times

Posted: February 20th, 2010, 5:20 pm
by Brucester
The winning time at Solon was 2:52 by Bala Cynwood. I agree with Jeff, it's going to be really competitive at nationals, and I bet people will hit 4 minutes.

Re: Flight Times

Posted: February 21st, 2010, 2:52 pm
by eta150
Actually, it was 2:46 (my plane). I agree that it will be way higher at nats, because, having approached 3 minutes in a ~20 foot gym, a 98 foot field house should give a significant increase.
P.S. It's Bala Cynwyd

Re: Flight Times

Posted: February 22nd, 2010, 6:42 am
by goblue007
jander said, Trim. Where's your cg with respect to your wing (either leading or trailing edge)? What angle of attack are your wing and tail at? Prop offsets? Wing offsets? Wing twist? Tail offset? Etc. In flight, is your plane on the edge of a stall, or over stabil? Dutch roll? Flight attitude (nose or tail high, wings level, rolled into or out of turn). Also, etc.

ok, the cg is on the trailing edge, the angle of attack is the leading edge is about a 1/4 in above the trailing, the wing is off set of the right and the their is not very much twist ( we are using the 2010 freedom flight model)

Re: Flight Times

Posted: February 22nd, 2010, 9:56 am
by eta150
The way the plane flies is important too. You can tell a lot of the problems with trim by seeing if it's stalling, turning too quickly, or flying very flat, smooth, and stable.

Re: Flight Times

Posted: February 22nd, 2010, 2:41 pm
by jander14indoor
goblue007 wrote:jander said, Trim. Where's your cg with respect to your wing (either leading or trailing edge)? What angle of attack are your wing and tail at? Prop offsets? Wing offsets? Wing twist? Tail offset? Etc. In flight, is your plane on the edge of a stall, or over stabil? Dutch roll? Flight attitude (nose or tail high, wings level, rolled into or out of turn). Also, etc.

ok, the cg is on the trailing edge, the angle of attack is the leading edge is about a 1/4 in above the trailing, the wing is off set of the right and the their is not very much twist ( we are using the 2010 freedom flight model)
Unless you have a partner posting under another aim, this is kind of out of the blue, since your last post was in Dec, so I'm not sure what the question is???

CG location is in at least the ball park, but the wing angle of attack seems a little extreme. Wing offset, discussing this on another string, not sure which "right" you mean. If looking at the plane from the front, OK, if from the rear, or as if a pilot sitting in the motor stick its backwords.

Like eta150 said, how's the plane behaving?

Jeff Anderson
Livonia, MI

Re: Flight Times

Posted: February 22nd, 2010, 3:05 pm
by eta150
I think his partner was hamtown.