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Old May 26, 2010, 06:54 AM
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JazzMan2001's Avatar
Hampshire, United Kingdom
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Guillows 403 Spitfire

I've bought a Spitfire kit to build as an R/C model, I have some questions:

1) How much thrust/watts is a good amount for these? I have been looking at somewhere between 80w and 140w 'speed 400' equivalent - obviously as you go up in watts the motors get progressively heaver and you end up needing a bigger ESC and a beefier battery.

2) What sort or weight should I be aiming for? I've been looking at motors between 25grams and 50grams.

I'm going to look at using depron for elements of the build should there be a weight saving.

I'll be making ailerons for it I've read lots of threads but can't get a clear picture on on what to power it with. I'd like decent performance so would prefer to have slightly more power than it needs.
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Old May 26, 2010, 03:22 PM
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I use about 100W/lb. My conversions this size fly great on about 50W and a RTF weight of about 8oz.
Something along the line of a blue wonder motor and an 800 size 2 cell battery would be about right.
Aileron/elevator control, no landing gear to keep the weight down.
Glenn
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Old May 26, 2010, 04:48 PM
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Thanks Glenn that's given me a good idea of what to aim for
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Old Jun 06, 2010, 08:01 AM
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Thought I'd post some progress pictures so far:















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Old Jun 06, 2010, 09:05 AM
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Looks great! Can't wait to see how she flies.

Dion
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Old Jun 06, 2010, 09:07 AM
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Hey JM,

Nice build! Mine is awaiting the return of nice weather for its maiden flight . If I could offer some advice of the hard-won kind, you need to take deliberate measures to concentrate the RC components as far forward as possible to avoid having to put extra weight in the nose to balance. Keep that bay just behind the F1 firewall for your battery and mount it upright if it fits, and move your servos forward into the bay just behind F2. Keep on posting!

Steve
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Old Jun 06, 2010, 10:35 AM
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Thanks My battery will be as far forwards as possible and I will move the servos if I have to but I think batter will need to go in lengthways.

Aileron wise did you use what's on the plan or make them bigger?

Here's some pics of the motor:





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Old Jun 06, 2010, 12:13 PM
The "pro" in procrastination
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Canada, ON, Kingston
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JM,

I made my ailerons full span after reading that some other guys have had sluggish aileron response with the scale sized ones. Aileron response is apparently strongly affected by speed, and your motor looks like it will have plenty of power to pull your ship around quickly, so perhaps the scale outlines will be fine. I'll let you know how mine work out as soon as I can maiden.

You can check out how I did it here:

http://www.rcgroups.com/forums/showthread.php?t=1165707

Steve
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Old Jun 06, 2010, 01:31 PM
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Quote:
Originally Posted by Steve85 View Post
JM,

I made my ailerons full span after reading that some other guys have had sluggish aileron response with the scale sized ones. Aileron response is apparently strongly affected by speed, and your motor looks like it will have plenty of power to pull your ship around quickly, so perhaps the scale outlines will be fine. I'll let you know how mine work out as soon as I can maiden.

You can check out how I did it here:

http://www.rcgroups.com/forums/showthread.php?t=1165707

Steve
Looks really nice
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Old Jun 06, 2010, 09:27 PM
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I added my ailerons after the initial build, and the size (below) proved ample. This plane has a great feature compared with the other planes in the kit series, in that it has by far the most wing area, at 1sq-ft. Mine has an old brushed/geared GWS EPS350C (C gear) on 3s with a scale size 3-blade 9" FSK prop, which has ample power with conserved throttle. At full, I'm sure it would smoke. The plane also is not light, at around 15 oz.

The things that I found worked well on this plane are:
Generous washout
Steep right-thrust angle (you can even see it in the pic)
approx 2 deg downthrust

The heavy right thrust angle is probably the most important, as the left torque effect was strong, without it.
After making the adjustments, the launch was actually one of the most hands off, of any of the Guillows warbirds I've flown.
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Old Jun 07, 2010, 02:13 AM
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thanks for the info I've build some wash out into the wings and will make appropriate adjustments to the angle of the motor.

With the ailerons I've gone for slightly bigger than the plans but not all the way along.
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Old Jun 07, 2010, 04:21 PM
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This is the size I've decided to go for on the ailerons







Not 100% happy with the hinges yet, need to leave it to dry overnight and see how it looks
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Old Jun 07, 2010, 04:51 PM
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Cut the hinges down to 1/4" wide strips, or 1/8"wide and add another one in the middle.
Glenn
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Old Jun 07, 2010, 06:15 PM
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With your ailerons starting close to the fuse, torque rods would work well. I have them on mine, and they are longer than yours would be, and work well. They were also a real sob to install and bend the rods, with the wing already built and covered. Much easier to install during the initial build.
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Old Jun 08, 2010, 02:09 AM
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Thanks for the tip on the hinges, I'll take another look at that tonight

I'm considering putting a servo in each wing as they are tiny little 3.7gram things and disappear inside the ribs!
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