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Jun 18, 2012, 11:28 AM
chuck-e-Jeez
Jeez's Avatar
It already has a spar :-D, but it could do with an airfoil. 5mm depron does flex with this wingspan
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Jun 18, 2012, 01:31 PM
Registered User
hondarider98's Avatar
I used elmers foam board for my f-22 and the wings feel super strong. They don't bend at all. Should I add one just to keep moisture from warping them?
Jun 18, 2012, 01:51 PM
Foam abuser!
crxmanpat's Avatar
Do you mean add a spar, or add a KF airfoil?

If spar, I always recommend adding a spar, not matter how stiff the foam feels. You be surprised at the amount of stress you can put on this airframe.

If KF, I say it doesn't need it. Some guys say it flies better, I say it flies just fine without.



Pat
Latest blog entry: Nico Hobbies
Jun 18, 2012, 01:52 PM
Foam abuser!
crxmanpat's Avatar
Oh, and next time you use Elmers, I suggest soaking the paper and removing it. Because as you say, if it gets wet it may warp.

Pat
Latest blog entry: Nico Hobbies
Jun 18, 2012, 03:56 PM
Registered User
Cid156's Avatar
I went out today without wind it was so boring...
I am using a emax 2805 2840kv with a 4.75x4.75 and 3s. I should have a good speed with this config
The plane is only 80% scale but I think the prop is too small and it is hide by the profil of the plane
Jun 18, 2012, 04:06 PM
Foam abuser!
crxmanpat's Avatar
The profile shouldn't be "hiding" the prop, even on the smaller size. The one in my avatar is about 65% of this one, and I use a GWS 4.5x3 prop and it works just fine.

Are you sure the prop is on correctly (front of the prop facing the front of the plane)?

Pat
Latest blog entry: Nico Hobbies
Jun 18, 2012, 04:16 PM
Registered User
Cid156's Avatar
Yes checked the video. It was done with a old battery
F22 depron... (2 min 48 sec)


I need maybe another prop with less pitch to get more trust

I just check with drive calculator
With the APC 4.75x4.75 I have 380gr 140km/h and 19A
With the GWS 5x4.3 I have 653gr 140km/h and only 16A
3A less for 300gr trust more...nice
Last edited by Cid156; Jun 18, 2012 at 04:25 PM.
Jun 19, 2012, 04:47 PM
chuck-e-Jeez
Jeez's Avatar
Pat,

I've got your motor (the suppo 2212-06 2200 kv) in the FF-117. Goes fantastic on a 2200mah 3S! Motor temp is 50 Celcius, and battery about 37. Forgot to measure the ESC, but was handwarm on all flights
On a 6x4 APC prop it does 115 km/h, yet more than 10 minutes of flying time.

I couldn't be happier!

Video (if that's okay in the F-22 thread...)
Taking the FF-117 parkjet for a spin. (3 min 1 sec)
Last edited by Jeez; Jun 19, 2012 at 04:48 PM. Reason: added video
Jun 19, 2012, 06:01 PM
Foam abuser!
crxmanpat's Avatar
Man that thing is fast!

Pat
Latest blog entry: Nico Hobbies
Jun 19, 2012, 07:10 PM
Registered User
superinstaller's Avatar
Yep, I tried the no spar version. Everything was great and after about 10-12 hard flights the wing totally gave pulling out of a 5G dive. Got a total of 10-12 flights on that one, I would always use something to keep wing flex under control!

Also Vids of foam F117s are always ok!
Jun 19, 2012, 11:22 PM
Slow Flyer
Bombay's Avatar
Quote:
Originally Posted by Jeez View Post
Pat,

I've got your motor (the suppo 2212-06 2200 kv) in the FF-117. Goes fantastic on a 2200mah 3S! Motor temp is 50 Celcius, and battery about 37. Forgot to measure the ESC, but was handwarm on all flights
On a 6x4 APC prop it does 115 km/h, yet more than 10 minutes of flying time.
Nice. Where are the plans or build thread for the 117? I feel the need.
Jun 19, 2012, 11:33 PM
A 4's forever
wildwillie63's Avatar
Go to rcfoamfighters.com for the plans.
Jun 20, 2012, 09:39 AM
Slow Flyer
Bombay's Avatar
Quote:
Originally Posted by wildwillie63 View Post
Go to rcfoamfighters.com for the plans.
Thanks! Many great looking plans/planes.
Jun 24, 2012, 05:06 PM
Registered User
Cid156's Avatar
So I try the gws5x4.3. I do not see a difference but the esc has cut two times.
I will check the amp draws with the apc4.75x4.75 and the gws 5x4.3

F22 depron with a Emax2805 on 3S and GWS5x4.3 (2 min 40 sec)
Jun 24, 2012, 11:32 PM
Gravity Sucks
Hi Cid156,
I've not used the emax motor, but isn't it a 2S motor? Check the picture below - you might be using too many V's and pulling too many A's for this motor....

2S and 12-14 A (<60 sec) recommended. Not sure on the reliability of those specs though, so if you have a better source of info for the motor maybe follow that, but just a thought!

Cheers,
ResQ


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