RE: Hangar 9 P-40 Warhawk  
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RE: Hangar 9 P-40 Warhawk - 9/30/2005 5:36:23 PM   
jrpav1


 

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Well I just picked up one of these ships and I'm glad I found this thread. I wasn't really fond of the servo mounting scheme so I was kind of glad to hear that the plane turns out tail heavy. Now I have a good reason to mount the servos in the radio compartment. I'm almost finished building it - can't wait to fly it. It sounds like it flies really well. One thing some of you guys might be interested in. Being a pattern flier, I like rubber-mounted motors. Since I'm powering my P40 with an OS 91FS (4-stroke) I figured it would be nice to put a rubber mount on this plane. It looks like the Dubro mount will install very easily. The two top holes in the P40 firewall are in the correct spot already. You only need to drill 2 new holes for the bottom mounting bolts, then install all of the blind nuts. Might be a good thing to consider if you're building one of these planes. Rubber mounts not only make the airplane quieter, they also help improve servo life and prevent hinge failures.

John Pavlick

(in reply to tailskid)
       Post #: 276

RE: Hangar 9 P-40 Warhawk - 9/30/2005 7:10:11 PM   
driedjello



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From: Omaha, NE, USA
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Holy Cow, Swamp Fox! I had no idea electric could be that powerful! That thing looked insanely fast! (Picking jaw up from floor)

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Warhawk

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RE: Hangar 9 P-40 Warhawk - 10/1/2005 7:23:32 AM   
luc-RCU



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From: Courbevoie, FRANCE
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john
if you want to make them still quieter, do like me...fly electric...
no rubber need

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< Message edited by luc-RCU -- 10/1/2005 7:24:04 AM >

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RE: Hangar 9 P-40 Warhawk - 10/3/2005 2:39:26 AM   
lthibault



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True... but to be perfectly honest with you, how long can you keep on flying? Once your battery is decharged, you need a high-powered charger that can drain your car battery - unless you start the engine... And if you want to fly again, you either buy other batteries (extremely costly) or wait an hour+ for the battery to be recharged.

I don't want to sound like a jerk here but this is why I switched back to glow...until there are affordable batteries and more convenient gear that will allow me to make several flights during a day.

Of course some purists say that nothing replaces the sound of a 4 stroke engine (I kind of agree )




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Luc

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RE: Hangar 9 P-40 Warhawk - 10/3/2005 3:40:50 AM   
LDM


 

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Luke I could not agree more , some of these Lipos in these warbirds start at $140 up to$280 .
I love E-flight for a quick run at the local park but for regular Rc I went back to glow .
For the most part you put the gas in , and power the baby up and go fly , no power management , no worry about slowing down when the power is slow ect ect .
I know the total benifits of e-flight and yes they are great , but glow sounds real , and keeps going and going and going .
Some of the mags list the cost of e-conversions on the bigger planes they review and for that money you can get a Jet !!!lol

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LDM

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RE: Hangar 9 P-40 Warhawk - 10/3/2005 5:38:22 AM   
driedjello



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From: Omaha, NE, USA
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Is it normal for the firewall to be installed at a couple degree angle? Please see the photo.



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RE: Hangar 9 P-40 Warhawk - 10/3/2005 5:49:27 AM   
luc-RCU



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it helps cancelling the torque of the motor....

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RE: Hangar 9 P-40 Warhawk - 10/3/2005 3:10:18 PM   
tailskid



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Yes, and wait until you put the cowl on......close on one side, big gap on the other!

Jerry

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RE: Hangar 9 P-40 Warhawk - 10/3/2005 5:08:45 PM   
seanychen



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The reason for right thrust has been discussed in the aerodynamic forums. I just want to briefly point out here that right thrust helps to compensate the yaw tendency caused by propeller producing a CCW spiraling thrust (as viewed from in front of the plane) as it goes past the fuselage and tail. Since more vertical fin occupy the space where the top half of the spiral, a left-yaw tendency is produced.

Right thrust is added to compensate this prop-spiral yaw effect. This is not torque, persay. Torque is in the rotational axis, so torque would cause the airplane from rolling, not yawing, to the left. This effect is generally not noticeable at flying speed. At low speed, where the wing wouldn't effectly counteract the torque, you will see engine/prop torque causing roll to the left, especially with throttling action. Hence you have torque roll. I also see this effect while taking off on water: my left float will dip into the water more when I advance the throttle.

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(in reply to tailskid)
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RE: Hangar 9 P-40 Warhawk - 10/3/2005 6:20:49 PM   
jrpav1


 

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Guys,
It always looks like a good idea until you consider the details. In reference to my Dubro motor mount suggestion, well it might work depending on your motor choice. Unfortunately, the carb. gets in the way if you're using an OS 91 (4C). Too bad.
Regarding electrics - I fly small electrics but I'm not interested in anything larger than S400 size. The cost of batteries is prohibitive, not to mention the fact that you need at least 4 packs and a 4 output charger to avoid the fly - charge - wait - fly scenario. Even with that you do have to wait sometimes. I always hated that when I raced R/C cars so I don't want to do it with my airplanes. Don't forget, batteries don't last forever, especially when you push them hard so you can't justify the cost based on fuel use / expense. When the battery technology improves I might reconsider but for now I'm happy with my slimers. As far as noise is concerned, a 160 with a quiet pipe (that's what I have in my pattern plane) turning an APC 3-blade at about 8300 RPM, hauling an 11lb. airplane is quieter than some geared speed 400s that I've seen. If that's too loud, then we all should start looking for another hobby.

John Pavlick

(in reply to seanychen)
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RE: Hangar 9 P-40 Warhawk - 10/3/2005 6:35:44 PM   
Edwin


 

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I reduced the right thrust on mine. Looked like too much. I used wood door shims since they are allready cut as a wedge. Turned out perfect and cut the right thrust about in half. Still flys good and only the standard torque pull that I see on all my other warbirds.
Edwin

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RE: Hangar 9 P-40 Warhawk - 10/3/2005 6:55:40 PM   
lthibault



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Also forgot to mention that Lipos can explode or cause a fire in your house. They are unpredictable beasts.

Companies that produce them are very reluctant to provide help once the packs are used...

As LDM mentioned, E-flight is great for park flying (I still get a kick out of flying my Alfa Model Corsair) but moving into electric .90 ARF means $$$ big time. You always find something that you need to buy: oops, that fancy Lipo Charger needs a 13.8 Volts Power Supply, oops, it's better to use a cell balancer, etc..

I've found that a lot of electrical engineers love it though

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Luc

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RE: Hangar 9 P-40 Warhawk - 10/3/2005 7:45:44 PM   
luc-RCU



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well, I think you should update your infos....
technology moves and what was true some time ago is no longer the case....
Anyway, I will not try to convince you....one day, you will certainly make the jump alone....

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RE: Hangar 9 P-40 Warhawk - 10/3/2005 9:38:28 PM