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Old 11-13-2002, 02:38 PM   #1
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electric power

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I have always been curious about electric power. I have a set of plans for the old royal skymaster. Have been going to redraw it and build one. Curious about using electric for it. It would be 76 inch wing span and around 9lbs. That for two saito 56 engines, or even better one 56 and a 72 in the nose. Question is how I go about finding out what electric motors would do the same. I know that good electric motor's cost almost as much as my saito's.
So with brushless motors, how would I figure out what size, how many batteries, and of course, where would I cut wieght down, ie lose all the light ply formers and replace with balsa??????

How long of extension cord should I get?

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Old 11-13-2002, 03:39 PM   #2
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Hi Jim
Most of the Royal kits were Very heavy construction and not very good for conversion to electric. The most important criteria for building electric is to build light but strong.
As an example I am building a Blenheim kit designed for electric here are the specs:
Wingspan 60"
Area 533 sq. inches
Weight(RTF with battery) 4.13#
Wing loading 17.8oz./ sq. ft.(most scale WW2 gassers are about 27oz/sq.ft.)
Powered by 2 Graupner Speed 600 throughway can motors
swinging 8-4 E-props @ 10K RPM.
There are calculations you can use to figure out exactly which motors, ESC and battery pack you need for a particular airframe to give you the results
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Old 11-14-2002, 09:43 AM   #3
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Thanks for the reply Airnut.
First, the skymaster would be redrawn in cad and laser cut. Use of lighter material and also building glass cowls would lighten it up. I know the old royal kits where very heavy.
I have seen some electric aircraft fly but the thing that I noticed more than anything was they all tended to be flotters. I am interested in the brushless motors, but they start talking about senors type and senorless type and I get lost.
I guess the problem here is I don't have enough info on the type of motors to even ask the right questions.
thanks again for the help and reply

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Old 11-14-2002, 10:17 AM   #4
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Talk to these guys, they gave a presentation at our club that was quite impressive.... seemed very knowledgeable.

MAAC# 12719
Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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Old 12-14-2002, 08:42 PM   #5
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First post here.

I'm an EMFSO member. Are there any others here?

I'm into E-helis now but I've built some large electric fixed wing including a Sr. Telemaster tow plane.

It can be a bit of a technical exersize to select an electric power system because there are more variables than with glow, but rest assured there is lots of information available to help you find a combo that will work. I think the best thing you can do is start reading the E-Zone. Read the FAQs first. Then do searches on similar projects and ask questions. I'd also be more than happy to answer some of your questions.

There are some good rules of thumb in the FAQs you can follow, like how many Watts/Lb your power system should be capable of. Another thing you can do is obtain software like MotoCalc to help select a power system.

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Old 12-15-2002, 09:34 PM   #6
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Yep, another proud EMFSO member here.
Currently in my stable...
-Avionik F5D - Goes like &*%# off a shovel
-Stinger F5D-400 - Goes like smaller &*%# off a shovel
-Sokol F5D-400 - Goes like smaller &*%# off a slightly slower shovel
-BalsaCraft Sea Fury - Hopefully I'll finish it this winter
-Zagi 400X - Yes, it seems everyone needs one of these for kicks. Ole' reliable for sure
-Ryan Aircraft Rare Bear - Nice looking, nice flying
-GP Ultimate 40 - Semi-successful E-conversion. Waiting for Lithium Polymer batteries to prove themselves
-Dumas 30" Standard J-1 - Rubber power yes, but pretty cool too!!!
-Models by John MiG-17C - Still in the box - Any buyers?
-Super Mini Diablotin - First one that'll go straight up 'till the batteries die. Hehehe

I'm currently in the process of building a Mark Drela SuperGee DLG. Learning lots of new skills in the process, I'd recommend this exercise to anyone as a fascinating winter project.

Any more EMFSO members? Electric flyers? Let's here what you're flying!


Dan Kitching
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Old 12-16-2002, 11:16 AM   #7
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clouddancer.One easy thing to remeber about e-flying is that the airframe must bw half the totale flying weight. The other half would be your power system,(batteries,motor,esc,) gearbox aslo if one is used. 6lbs plane ,3lbs /3lbs.If you can get the airframe to 2lbs thats even better.Just remeber,"BRICKS DON'T FLY GOOD".I'll talk more when i get home.Doing this thing called work stefan
Fly fast/Fly quite!!
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Old 03-28-2003, 08:21 AM   #8
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Electric Power

Clouddancer and others: I have found the following calculator program to be a great learning tool for getting a grip on E-power. Play with it and you will learn a ton. It might not be totally accurate at times, but it's in the ball park.

Tex Gehman, Winnipeg
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