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MR RF4 1/4 scale electric power setup


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Hi everyone

Hoping to get some help with regard to a electric power setup for my nearly complete RF4.

rf4 complete.jpg

I had originally thought it would come out weighing 9lbs, however it's looking more like 10.5lbs (still in the range suggested by MR)

So I had thought of 850watts power with a 5s pack, 750 kV motor, 70A ESC, prop size is 12x6 due ground clearance.

I'm thinking this is still going to give me adequate performance.

I think a larger battery pack is going to be difficult to accommodate.

img_20160620_170517.jpg

Appreciate any thoughts other builders might have.

img_20160620_165838.jpg

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Hi Martin,

The usual rule of thumb is 100 Watts/lb and this gives a distinctly "sporty" performance.

Your setup will give a little under 85 W/lb which should be excelent for a model like the Fournier.

If you have the exact motor/battery details you can put them into an online calculator such as ecalc to give you a reasonable indication of the thrust, duration etc.

Cheers, Pete

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Thanks Pete, appreciate your comment.

Steve, more pictures in the RF4 album, I'm sure it's public. How much did yours weigh in the end ?

Any other builders of this model go with electric power ? Would love to have your thoughts on battery, prop, motor etc.

Cheers

Martin

 

Edited By Martin Fane on 21/06/2016 17:32:34

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  • 6 months later...

A fellow club member had one years ago with an 80s vintage OS 46, and the model flew in a very convincing fashion.

The figures you have quoted look very sensible, and will give good performance. You most certainly don't need (or really want) 6S for this model. Might I ask: what is the issue?

Kind regards,

John

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  • 6 years later...

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