Martin Fane Posted June 21, 2016 Share Posted June 21, 2016 Hi everyone Hoping to get some help with regard to a electric power setup for my nearly complete RF4. 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. Appreciate any thoughts other builders might have. 1 Quote Link to comment Share on other sites More sharing options...
pete taylor Posted June 21, 2016 Share Posted June 21, 2016 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 Quote Link to comment Share on other sites More sharing options...
Fatscoleymo Posted June 21, 2016 Share Posted June 21, 2016 Looking good Martin....more photos? Have you gone with Mick's airbrake configuration or put in electric units? Fats Quote Link to comment Share on other sites More sharing options...
Martin Fane Posted June 21, 2016 Author Share Posted June 21, 2016 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 Quote Link to comment Share on other sites More sharing options...
John Emms 1 Posted January 10, 2017 Share Posted January 10, 2017 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 Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted January 10, 2017 Share Posted January 10, 2017 From Mick Reeves site Electric version from John Taylor from Surrey. Model weighs 8 1/2 lbs. Protech MC50 5508 motor, 55 amp ESC, 5S battery, 12 x 10 prop Quote Link to comment Share on other sites More sharing options...
curley Posted September 23, 2023 Share Posted September 23, 2023 Please can you help me? I have a "second hand" kit of this model. But missing the parts list and building instructions. May be you have building pics of your model? Thank you Kind regards John Aarnoudse The Netherlands Quote Link to comment Share on other sites More sharing options...
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