Tim Donald Posted May 4, 2021 Share Posted May 4, 2021 I'm thinking about building a simple F5J glider called an introduction https://www.hyperflight.co.uk/products.asp?code=INTRODUCTION-F5J&name=introduction-f5j-2-9m The recommended motor is a Hacker A20-22L evo (although there are alternatives) but I was wondering if I could use the Ripmax motor and 40Amp ESC that came in a now retired Wot4 foam-e? They don't seem to publish exact spec for the ripmax motor but I believe it is about 820 kv. The glider would be a couple of hundred grams lighter then the Wot4 at about 950 to 100g. Can anybody help as I'm next to useless at understanding electrics ! Thanks. Quote Link to comment Share on other sites More sharing options...
EarlyBird Posted May 4, 2021 Share Posted May 4, 2021 (edited) The a20-22l is 28 mm dia and 36mm long 200 watts which gives 100w/lb The ripmax is 35 mm dia and 36mm long 360 watts. IIRC which gives 180w/lb ish Ripmax is bigger and more powerful so the questions are will it physically fit and will the model be overpowered? No answers just more questions. ? Edited May 4, 2021 by EarlyBird More info added Quote Link to comment Share on other sites More sharing options...
Piers Bowlan Posted May 4, 2021 Share Posted May 4, 2021 (edited) Hi Tim, I would have thought that your ripmax motor would be well suited to the model. The Hacker A20-22L has a kv of 924 whilst your ex Wot4 motor a Kv of 820, so in a similar ball park. Your Wot4 motor is rated at 30A max so fitting a 40A ESC as you proposed would give you some head room. Weather it will fit is another matter! Software like Motorcalc would give you a more scientific appraisal of your motor's expected performance. Use a watt meter when trying propellers. Edited May 4, 2021 by Piers Bowlan Quote Link to comment Share on other sites More sharing options...
Tim Donald Posted May 4, 2021 Author Share Posted May 4, 2021 Thanks Steve / Piers. Sounds like it would be ok if it physically fits. I think I will just order the kit and see and if no good order something that does fit. I will have a look at the Motorcalc that you mention - I've got to learn ! Thanks for your help. Tim. Quote Link to comment Share on other sites More sharing options...
Shaun Walsh Posted May 4, 2021 Share Posted May 4, 2021 30 minutes ago, Tim Donald said: Thanks Steve / Piers. Sounds like it would be ok if it physically fits. I think I will just order the kit and see and if no good order something that does fit. I will have a look at the Motorcalc that you mention - I've got to learn ! Thanks for your help. Tim. Just looked at the instructions for the Introduction, the recommended motor looks a pretty tight fit, don't think anything wider will fit. Something like this might be suitable. 4-Max motor Quote Link to comment Share on other sites More sharing options...
Tim Donald Posted May 4, 2021 Author Share Posted May 4, 2021 Thanks Shaun, yes I think you are right. Oh well it was worth investigating. Thanks for the 4-max suggestion too. Quote Link to comment Share on other sites More sharing options...
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