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Old Jan 10, 2009, 06:08 PM
MERLIN V16 is offline
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Never Trade Luck for Skill
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I hope the guy that thought that one up is on unemployment!
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Old Jan 19, 2009, 02:04 AM
Chris F is offline
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The Revegetator
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I took my P-40 for a spin today. I posted pics of it here quite a while ago when I finished it, but it hasn't been out for ages so here are some more .
Old Jan 19, 2009, 03:07 AM
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Looking very good, whats the best way to fix on the foam spinner?
Old Jan 19, 2009, 04:00 AM
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Long live the Nuge!!!
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Sharp looking P-40 Chris. I have always admired the lines of this airframe, alas, my GWS P-40 sits in the closet awaiting parts funding... Sad, sad story.
Old Jan 19, 2009, 04:09 AM
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Thanks Nick and skywarp.
I glued the supplied rubber spinner into the foam spinner and opened up the hole enough for it to grip the thread on the motor shaft. It comes off very easily, but stays on during flight.
Last edited by Chris F; Jan 19, 2009 at 04:14 AM.
Old Jan 19, 2009, 11:08 AM
denial15 is offline
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swede
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Chris F, What motor are you running?
Old Jan 19, 2009, 02:44 PM
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Quote:
Originally Posted by denial15
Chris F, What motor are you running?
I believe it is one of these
http://www.hobbycity.com/hobbycity/s...-drive_2810/12
Here is a poor quality video of the model. I usually fly it a lot slower but it was a windy day.
https://www.rcgroups.com/forums/show...9#post10564719
Check my blog for more details including pictures of the motor at the end of my GWS FW-190 build thread.
Last edited by Chris F; Jan 19, 2009 at 02:50 PM.
Old Feb 10, 2009, 11:14 AM
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swede
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Okay, I think I'm almost ready for maiden. It weighs in at 27.5 oz with a Dubro 3-blade spinner and 62 gr. of stainless steel in the tail to counterbalance the stupid spinner. I'm getting continuous 260 W at 24 Amps. with a Rhino 3S2200 (Zippy) pack. The initial burst was at around 280 W at 27-28 amps.

Is that going to give it enough juice?
Old Feb 10, 2009, 11:22 AM
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260 watts into less than 2lb plane = yes, assuming you have enough pitch speed to get it to fly. The elevator is pretty effective, i.e. be careful of too much throw, and th elevator is airfoiled. If you trim it level with the stab, you will be waayyy off neutral flight. I use the mold marks on the stab and elevator to get a rough setting on the trim.
Old Feb 10, 2009, 11:33 AM
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swede
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How do I figure pitch speed? I'm guessing I'd probably need some sort of a tach?

I'm running this prop. They say it's 8.7x6, however I think it's closer to a 9x6, not that it will make much difference.
Old Feb 10, 2009, 12:55 PM
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Quote:
Originally Posted by denial15
Okay, I think I'm almost ready for maiden. It weighs in at 27.5 oz with a Dubro 3-blade spinner and 62 gr. of stainless steel in the tail to counterbalance the stupid spinner. I'm getting continuous 260 W at 24 Amps. with a Rhino 3S2200 (Zippy) pack. The initial burst was at around 280 W at 27-28 amps.

Is that going to give it enough juice?
It will be a lead sled at that weight. Have you considered going with a smaller lipo and ditching some tail weight?
Old Feb 10, 2009, 12:56 PM
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swede
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Quote:
Originally Posted by Tom Frank
It will be a lead sled at that weight. Have you considered going with a smaller lipo and ditching some tail weight?
I think if I lose much more in the battery compartment, I will not have much time to do more than take off, do a circle and land.
Old Feb 10, 2009, 01:10 PM
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Quote:
Originally Posted by denial15
I think if I lose much more in the battery compartment, I will not have much time to do more than take off, do a circle and land.
Maybe so if you fly near WOT. I'm flying mine (EPS version) at about 1/2 that power level and 4.5 oz. lighter... 12-14 min. flights on 1300 mAh packs. Very good aggressive scale performance.
Old Feb 10, 2009, 01:15 PM
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swede
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What motor and prop are you using?
Old Feb 10, 2009, 01:32 PM
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Denial - one quick and dirty test is to hold the plane by the wing tip (nose pointed up). Apply the throttle - if the plane can support it's own weight and hold itself horizontal - it will have enough thrust to fly. If it wants to climb all the way around the wing tip and try to eat your other hand - then you have a good amount of power

Pitch speed is found like this
Voltage (under load) * Kv (measured or figured at 70% of listed Kv) * pitch / 1056

V*Kv can be omitted if you have a tach -

Easier format = rpm*pitch/1056 = mph of pitch speed.


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