Nigel Heather Posted June 27 Share Posted June 27 I’m interested in a WOT4 EP, there are a couple of things I would need to sort out, but the answer to one question may cool my interest. The recommended battery is a 4S 4500mAh - why such a big capacity, is that for longer flight times or is the weight needed to balance it. The reason I ask if that I have some 4S 3300mAh and it would be great if I could use those but buying a set of 4S 4500mAh would be a turn off. Quote Link to comment Share on other sites More sharing options...
Tom Gaskin 1 Posted June 27 Share Posted June 27 Nigel, Your Lipo's will be fine. The recommended ones will give a slightly longer fight time. You may find that the CG may be a tad further back with your lighter batteries, but shouldn't be too bad. Tom Quote Link to comment Share on other sites More sharing options...
Shaun Walsh Posted June 27 Share Posted June 27 https://forums.modelflying.co.uk/index.php?/topic/37036-ripmax-wot4-gpep/ Quote Link to comment Share on other sites More sharing options...
Shaun Walsh Posted June 27 Share Posted June 27 A 4s 3300 might require some extra lead in the nose. Also, if you fly "with enthusiasm" you might find flight times are limited. propCalc estimates 6 minutes mixed flying with 15% battery reserve assuming you use the recommended motor drawing a max of 49A on a 12x7 prop. For comparison I get about 5 mins from a 3000mAh battery in a souped up Riot drawing 38A if I throw it around or about 8 minutes just pottering about. 1 Quote Link to comment Share on other sites More sharing options...
Geoff S Posted June 27 Share Posted June 27 I assume you mean an electrified Balsa Wot 4 - the one that can be either glow or electric powered. I did my own thing with the electric installation and it balances perfectly with a 4S 4AH although in its original state I added a few grams on the tail for around 8 minutes (more than enough for me). After I remodelled it a couple of months back and made a new fuselage it flies OK with the same packs without tail weight. I think with a smaller battery you'll need some extra nose-weight - obviously duration will be less, how much less depends on your enthusiasm. I use 4S 4AH LiPos in other models so it wasn't an issue for me. 1 Quote Link to comment Share on other sites More sharing options...
Nigel Heather Posted June 27 Author Share Posted June 27 Thanks for all the help. Pretty much as I feared, I’d have to spend £200 on new batteries to fly one so I won’t bother. Cheers, Nigel Quote Link to comment Share on other sites More sharing options...
Mike Blandford Posted June 27 Share Posted June 27 You could consider using two, 4S 3300mAh in parallel. A WOT4 won't mind the extra weight and you would get longer flight times. I have an aerobatic model that is significantly larger than a WOT4 and use two, 4S 3000mAh in parallel. Mike Quote Link to comment Share on other sites More sharing options...
Geoff S Posted June 27 Share Posted June 27 1 hour ago, Nigel Heather said: Thanks for all the help. Pretty much as I feared, I’d have to spend £200 on new batteries to fly one so I won’t bother. Cheers, Crikey! How many batteries do you think you'll need? It'll fly fine on your 4S 3.3AH LiPos just not for quite as long - and you get extra landing practice 🙂 In fact it may even fly better because it could be lighter as you'll be able to add any extra balancing weight further forward so its moment effect will be greater. Mike: I doubt if there's space for 2 3.3AH LiPos. It's not that roomy, though my home-made fuselage allows a bit more room compared to the original. Quote Link to comment Share on other sites More sharing options...
Shaun Walsh Posted June 27 Share Posted June 27 (edited) https://hobbyking.com/en_us/turnigy-battery-5000mah-4s-25c-lipo-pack-xt-90.html Edited June 27 by Shaun Walsh Quote Link to comment Share on other sites More sharing options...
Richieg66 Posted June 28 Share Posted June 28 (edited) I have the ARTF Wot 4 electric conversion pack fitted to my Wot 4. I started with 4s 3600 packs and then then moved to 4s 4000 packs. The 4000 packs are quite snug though. Probably best to check the width of the batteries you are going to buy. If you already have 3300 lipos I reckon they would be fine for 5 to 6 minute flights unless you are hoping around on full throttle. http://www.ripmax.com/Item.aspx?ItemID=A-CF002/ELP Edited June 28 by Richieg66 1 Quote Link to comment Share on other sites More sharing options...
Duncan Disorderly Posted June 28 Share Posted June 28 11 hours ago, Nigel Heather said: I’d have to spend £200 on new batteries to fly one Or spend it on a Chargebox and only ever buy one LiPo for any plane you own from that point onwards. Have as many flights as you want. The only limitation is the size of the Li-ion pack inside the Chargebox, so just make it slightly bigger than you'll ever need. I've found it to be a much better way of going about electric flight and it would mean that you wouldn't get put off like this any more. It's the whole reason why I did it! Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted June 28 Share Posted June 28 I don't think the OPs issue is having to charge a limited number of LiPos, it's not having any suitable LiPos.... unless I have misunderstood 1 Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted June 29 Share Posted June 29 3300 mah will be fine . I built a Wot4 for a club mate . He supplied the ESC motor and 3300 mah 4s battery. I modified the fuz so battery hatch was behind the U/C mounting plate and battery slid up and forward into what was the tank bay to obtain a correct CG . Flew perfectly well giving decent flight times with loads of power. Using the throttle as an on / off switch is why many get short flights. Too big a battery give a little longer flights but is generally counter productive making the model sluggish or hard to ballance 3 Quote Link to comment Share on other sites More sharing options...
Geoff S Posted June 29 Share Posted June 29 4 hours ago, Engine Doctor said: 3300 mah will be fine . I built a Wot4 for a club mate . He supplied the ESC motor and 3300 mah 4s battery. I modified the fuz so battery hatch was behind the U/C mounting plate and battery slid up and forward into what was the tank bay to obtain a correct CG . Flew perfectly well giving decent flight times with loads of power. Using the throttle as an on / off switch is why many get short flights. Too big a battery give a little longer flights but is generally counter productive making the model sluggish or hard to balance Absolutely. My Hobbyking Gloster Gladiator came with a couple of 4S 2200mAH LiPos and the maiden flight was almost 10 minutes because it wouldn't come down, even with the throttle shut (clumsy me had been trimming the throttle rather than the elevator - I wondered why it still climbed a bit even after trimming!). I needn't have worried, there was still plenty left after I landed. I had been thinking of flying it with 4AH 4S packs, which will go in easily, but I think the extra weight would spoil its performance. I'm sure the Wot4 will be fine on 3.3AH 4S LiPos 1 Quote Link to comment Share on other sites More sharing options...
Nigel Heather Posted July 9 Author Share Posted July 9 On 28/06/2024 at 11:53, GrumpyGnome said: I don't think the OPs issue is having to charge a limited number of LiPos, it's not having any suitable LiPos.... unless I have misunderstood Yes, exactly this. I already have four 4S 3300mAh and it would be nice to be able to reuse them. If the answer were "no, they are too light, you need 4500mAh batteries" then I would need to purchase them which is where my estimate of an extra £200 came from. Quote Link to comment Share on other sites More sharing options...
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