Lydd Model Flying Club. Kents Best.

The Lydd Model Flyers are a BMFA Registered Model Aero Club on the Romney Marsh, UK.
 
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 electric wizardry

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grounded

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Number of posts : 808
Age : 62
Location : Greatstone
Registration date : 2008-02-15

PostSubject: electric wizardry   Wed 28 May 2014, 11:06 am

After seeing how many twins go in when an engine stops I,be decided to finish the mossie as electric. Looking on the net, it would appear that a 400W motor is equivalent to a.50 I c but when you look at the thrust with a 13" prop it gives 3.48lbs that would mean only just under 7 lbs Static thrust for two which wouldn't get it rolling. The mossie will weigh at min 11lbs. Any one give me a clue what motors to get?

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rotorman

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Number of posts : 465
Age : 56
Location : greatstone
Registration date : 2010-09-10

PostSubject: Re: electric wizardry   Wed 28 May 2014, 11:45 pm

Hi Dave, As a rule of thumb 100w/lb input power should give a power to weight ratio of 1:1 which is good for sports and mild aerobatic flying. Your ratio of 7:11 for the Mossie is quite acceptable considering most full size aircraft are less than 0.5:1. To get that thrust from the input power you need to be efficient by choosing the best motor,prop,esc and battery combination. Try using a calculator like this one. http://adamone.rchomepage.com/calc_motor.htm
Hope this helps.
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grounded

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Number of posts : 808
Age : 62
Location : Greatstone
Registration date : 2008-02-15

PostSubject: Re: electric wizardry   Thu 29 May 2014, 9:35 am

Thanks, that's brill Bravo  once I've got all the bits together, I can modify the wing build to accommodate batteries etc. Gonna put the ESC,s in the scale rads for cooling with the batteries in the bomb bay. Might even get cameras to fit as I,m building the PR version.
That's my summer build sorted lol! lol! 

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