Dave Potter Posted February 21, 2018 Share Posted February 21, 2018 Hi Guys. I have brought a new Turnigy motor SK3 4240 740 and I can't find any prop sizes can anyone help ? Thanks Dave..... Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 21, 2018 Share Posted February 21, 2018 Can you say more Dave, as each added cell on your lipo pack will require a larger diameter prop. You need to post, model, weight, lipo pack etc Quote Link to comment Share on other sites More sharing options...
Dave Potter Posted February 21, 2018 Author Share Posted February 21, 2018 Hi Denis. It's a wots wot i had given to me for my grandson to learn to fly. I have converted it to electric. I wil be using 4cel lipo battery and the all up weight will be about 5lbs Thanks Denis. Edited By Dave Potter on 21/02/2018 16:26:11 Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 21, 2018 Share Posted February 21, 2018 Look at this Post Dave **LINK** There is quite a bit on this site, but your search has to be accurately spelt and worded Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted February 21, 2018 Share Posted February 21, 2018 I've just got a Wot4 fitted with a 4250 710kv motor. On a 13*8 APC-E prop it's pulling about 600W at just over 40A on a 4S 3300mAh pack. You should find your 740kv motor pulls about 45A on the same prop at a guess. Do you have a wattmeter to check it with? If not you really should get one as it's essential for setting up electrics. As for learning to fly with a WotsWot, that might not be such a good idea. It's quite a big model and not as resilient as a dedicated trainer. Being fully aerobatic it's more responsive too. Maybe get a proper trainewr and use the gear out of the WotsWot until the Grandson gets a bit of experience? Quote Link to comment Share on other sites More sharing options...
Dave Potter Posted February 21, 2018 Author Share Posted February 21, 2018 Sorry guys it's a uno wat. what a plonker I am. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted February 21, 2018 Share Posted February 21, 2018 Posted by Denis Watkins on 21/02/2018 16:11:39: Can you say more Dave, as each added cell on your lipo pack will require a larger diameter prop. You need to post, model, weight, lipo pack etc Denis, each added cell should require a smaller dia prop. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 21, 2018 Share Posted February 21, 2018 Woops, thanks Frank, I've had this winter virus, but that's no excuse This is a Uno Wot guys, so check gain Prop and motor here Dave http://www.modelflying.co.uk/forums/postings.asp?th=132187 Edited By Denis Watkins on 21/02/2018 19:33:26 Quote Link to comment Share on other sites More sharing options...
Sunny Posted February 21, 2018 Share Posted February 21, 2018 When i tested this motor a while back using Zippy Compact 4s 4000 25c and APC-e props i got the following results : Prop Current(A) Power(W) 13 x 6.5 39.2 565.8 14 x 7 53.5 747.3 Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted February 21, 2018 Share Posted February 21, 2018 Judging by Chris Foss' own conversion notes here it sounds as though it will go well on 300-350W, and from the figures in Sunny's post above I would start with something around 12*5 or 12*6 on 4S or 13*6 on 3S, though at the risk of repeating myself - a wattmeter helps! Do you have batteries as this is the starting point seeing as the motor is already a fixed element. What you really need is someone running this motor on 3S to confirm. Edited By Bob Cotsford on 21/02/2018 22:20:32 Quote Link to comment Share on other sites More sharing options...
Dave Potter Posted February 28, 2018 Author Share Posted February 28, 2018 Hi guys, Thanks for all the advice I have received from you all. It's all been a great help. I have now brought myself a wattmeter. Cheers Dave... Quote Link to comment Share on other sites More sharing options...
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