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MERLIN V16 · Jan 10, 2009, 05:08 PM

I hope the guy that thought that one up is on unemployment!

Chris F · Jan 19, 2009, 01:04 AM

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

.

nickthefarrow · Jan 19, 2009, 02:07 AM

Looking very good, whats the best way to fix on the foam spinner?

skywarp1 · Jan 19, 2009, 03:00 AM

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.

Chris F · 03:14 AM

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.

denial15 · Jan 19, 2009, 10:08 AM

Chris F, What motor are you running?

Chris F · 01:50 PM

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.
http://www.rcgroups.com/forums/showt...9#post10564719
Check my blog for more details including pictures of the motor at the end of my GWS FW-190 build thread.

denial15 · Feb 10, 2009, 10:14 AM

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?

JimNM · Feb 10, 2009, 10:22 AM

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.

denial15 · Feb 10, 2009, 10:33 AM

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.

Tom Frank · Feb 10, 2009, 11:55 AM

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?

denial15 · Feb 10, 2009, 11:56 AM

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.

Tom Frank · Feb 10, 2009, 12:10 PM

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.

denial15 · Feb 10, 2009, 12:15 PM

What motor and prop are you using?

JimNM · Feb 10, 2009, 12:32 PM

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.

Jan 19, 2009, 01:04 AM	#1247
Chris F The Revegetator Melbourne Australia Joined Jun 2006 1,984 Posts	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 . Images View all Images in thread Views: 210 This is my "throw in the car" model that I sometimes take to work. Views: 232 You can see in this shot that I moved the exhaust stacks forward into a more realistic position.

Jan 19, 2009, 03:09 AM	#1250
Chris F The Revegetator Melbourne Australia Joined Jun 2006 1,984 Posts	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. Images View all Images in thread Views: 160 Views: 164
	Last edited by Chris F; Jan 19, 2009 at 03:14 AM.

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Jan 10, 2009, 05:08 PM	#1246
MERLIN V16 Never Trade Luck for Skill United States, FL, North Port Joined Jan 2005 12,889 Posts	I hope the guy that thought that one up is on unemployment!

Jan 19, 2009, 02:07 AM	#1248
nickthefarrow Registered User UK Joined Dec 2002 206 Posts	Looking very good, whats the best way to fix on the foam spinner?

Jan 19, 2009, 03:00 AM	#1249
skywarp1 Long live the Nuge!!! South Central......Kansas Joined Oct 2007 1,451 Posts	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.

Jan 19, 2009, 10:08 AM	#1251
denial15 swede 10-95 Joined Aug 2005 3,549 Posts	Chris F, What motor are you running?

Feb 10, 2009, 10:14 AM	#1253
denial15 swede 10-95 Joined Aug 2005 3,549 Posts	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?

Feb 10, 2009, 10:22 AM	#1254
JimNM WAA-08 THANK FRANK! Las Cruces, New Mexico, United States Joined Jun 2002 6,402 Posts	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.

Feb 10, 2009, 10:33 AM	#1255
denial15 swede 10-95 Joined Aug 2005 3,549 Posts	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.

Feb 10, 2009, 12:15 PM	#1259
denial15 swede 10-95 Joined Aug 2005 3,549 Posts	What motor and prop are you using?

Feb 10, 2009, 12:32 PM	#1260
JimNM WAA-08 THANK FRANK! Las Cruces, New Mexico, United States Joined Jun 2002 6,402 Posts	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 VKv can be omitted if you have a tach - Easier format = rpmpitch/1056 = mph of pitch speed.