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Old 08-11-2009, 06:53 PM   #1
Flying French Dude
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help please

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ok i want to build a small electric parc flyers i have a spectrum microlite receiver and 3 e-flight 6 grams servo this is the plane i am building

my problem is i have no idea on what motor esc/bec and battery to use

i all i have flyed is glow .40 - 60 eng i will build the plane with elevator ruder and aileron

and i would like to have at least 10-15 min flight time ty for your help
smilling me? nah this is my flying face
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Old 08-11-2009, 07:32 PM   #2
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Re: help please

It depends on how much the plane weighs .. ready to fly with battery and motor
50 Watts per pound is the minimum, 75 W/lb it will do mild aerobatics, 100 W/lb it will do stunt aerobatics, 150 W/lb and it will go vertical as soon as you let go of it.
I would suggest around 75W/lb for that type of plane.
1 Watt = 1 Volt x 1 Amp
So if the finished plane weighs 1.5 pounds you need ( 1.5X75 ) around 112 watts .. with a 3 cell Lipo of 11.1 volts you need to draw around 10 Amps. ( 11.1X10 = 111 watts )
So you need a motor that will draw 10 amps with an 11.1 volt supply and an esc that will handle 15 amps ( you need a bit of reserve )
A park 450 looks about the correct size IF the plane weighs 24 ounces ..
There is a good chart on this site for Rimfire motors

Last edited by bobreib; 08-11-2009 at 09:45 PM.
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Old 08-11-2009, 08:14 PM   #3
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Re: help please

Bob has the right idea - weight is the important issue here. His watts per pound numbers are a very good rule of thumb.

Another good rule of thumb is that the plane itself will be half of the actual weight when finished. The other half of the weight comes from the radio gear and the motor/ESC/batteries.

Build it, weigh it, and then decide. Make allowances to shift the batts around to set the CG.
Mine is not to reason why; I just wire them up to fry...I mean Fly!
I don't suffer from insanity...I enjoy every minute of it!!!
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Old 08-15-2009, 08:39 AM   #4
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Re: help please

I don't want to put a damper on your Guillow's conversion but it's not the easiest thing to do. For a first build of a park flyer or other very light model I would recommend that you first build a newer design, something laser cut and designed with new electric components. This way you have a recommended power system that is tested and will work. You will have a park flyer you know will fly for your efforts.
Once you have done this and you have some feel for light building (I.E. you are able to resist the urge to beef everything up for strength like you need to do with a .60 size glow plane) then go to RC Groups and read some of the threads on other people’s Guillow’s conversions.
I have several of these kits around and the old die cutting (crushing?) and the crappy wood make them a real challenge. Go to Zebra Hobby and get a modern laser cut electric kit, build and fly it first. Then you will have a lot better idea of what needs to be done to get one of these Guillow’s kits into the air including working with micro light covering materials.
You have made a good choice for your subject though. You will have better luck with it than the higher wing loading on a fighter.

Last edited by robonline; 08-16-2009 at 06:23 PM.
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Old 08-16-2009, 05:16 PM   #5
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Re: help please

Originally Posted by Flying French Dude View Post
... i all i have flyed is glow .40 - 60 eng ...
For a rainy day ...

* Presentation: de-mystifying Electric Flight

-> Beginner Guide

* E-book: Everything You Wanted To Know About Electric Powered Flight
Corresponding discussion:

* Several Wiki's

* Get a current/Watt-meter, it will save you money and will more than pay for itself!
3$ diy Watt-meter:

-> Faq

Get a current/Watt-meter

* System wiring diagrams:
* LiPo pack and balancer cable wiring:

Get a current/Watt-meter

* Monthly Ampeer newsletter, on paper and online available. Excellent articles in the archives by e-flight pioneers Ken Meyers and Keith Shaw a.o.

Get a current/Watt-meter

* Brushless motor animations and simulations. Mostly outrunners but inrunners are just outrunners turned inside out, nothing fancy:

Get a current/Watt-meter

* Choosing a power setup

Get a current/Watt-meter

* E-flight calculators, a compilation

Get a current/Watt-meter

* Current, voltage, Watt, battery-types and -C-rating explained

Get a current/Watt-meter

* 'Dry' testing brushless motors after a mishap:

Get a current/Watt-meter

* How to repair a brushless motor

Get a current/Watt-meter

* Motor_rewinding_101, about poles, winds, delta, star
-> knowledge base
-> basic overview (1-5)

* And last but not least get a current/Watt-meter
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Old 08-16-2009, 05:22 PM   #6
ron van sommeren
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Re: help please

Forum in y'olde country, in case you get fed up with the Brits here
-> forums

FAQs and databases Francaises

Mailling Liste Electron-libre, empty message to:, subject: subscribe
optional, subject: set digest

Vriendelijke groeten Ron

Last edited by ron van sommeren; 08-16-2009 at 05:36 PM.
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