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Post by tommy1800 on Apr 11, 2011 18:59:48 GMT 1
I upgraded my SC with a brushed setup, but I wanted to use the stock electronics for some other project. So I built a foam jet out of Dollar Tree Foam, and put all the stock electronics from the SC in it. The only problem is that I had to trim the stock prop down to a 7 inch prop to fit it in. Does anyone know what the thrust might go down to from the stock 9X6 prop? Does anyone know the thrust of the stock motor with the 9X6 prop?
Since I just trimmed (cut with scissors) down the 9X6 prop to 7 inches, would I get a lot more thrust using an actual 7 inch prop vs. the trimmed one? How much more thrust...additional 5%...10%...25%?? Just seeing if anyone had some thoughts on the subject.
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Post by geoff2474 on Apr 11, 2011 19:35:28 GMT 1
Since I just trimmed (cut with scissors) down the 9X6 prop to 7 inches, would I get a lot more thrust using an actual 7 inch prop vs. the trimmed one? How much more thrust...additional 5%...10%...25%?? Just seeing if anyone had some thoughts on the subject. Hi Tommy There is no such thing as a 7" prop. Props are made and sold with two distinct measurements. The diameter (7"etc) and the pitch (the theoretical distance the plane will move forward for each rotation of the prop). You will have to experiment with several 7" props of different pitches to decide on the best one for your setup. Ideally you should use a wattmeter, that will tell you how many amps the motor is drawing at a certain voltage. Otherwise you could easily be over or under proping. Guesswork could leave you very underpowered or with fried electrics. Geoff |
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Post by tommy1800 on Apr 11, 2011 22:39:23 GMT 1
Using the stock ESC and motor, would there be anyway to, realistically, over prop the combination since the stock prop is 9x6. I know that I need a 7x? prop, but what would the "?" be in order to maximize thrust, and would that be too much for the stock electronics?
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Post by geoff2474 on Apr 12, 2011 9:15:09 GMT 1
Using the stock ESC and motor, would there be anyway to, realistically, over prop the combination since the stock prop is 9x6. I know that I need a 7x? prop, but what would the "?" be in order to maximize thrust, and would that be too much for the stock electronics? Hi Tommy I guess that you could probably get away with any 7" prop, but you won't know if it is the best without gathering some data. You could try an assortment and gauge the difference, they only cost pennies. You will find some usefull info on props elsewhere on this forum. I recall a recent post where several similar props were tested and found to give vastly different readings for what was supposed to be the same size prop. There are also different types of prop, Slow Fly, Electric etc. good luck Geoff |
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Post by ginginho on Apr 12, 2011 12:55:35 GMT 1
Tommy, have you retained the gearbox with the stock motor in your scratch build? IIRC this is equivilent to around 1000-1100Kv, whereas the motor alone is around the 3000Kv mark. This will have a big factor on what size prop is suitable for your application.
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Post by tommy1800 on Apr 12, 2011 17:34:06 GMT 1
Yes, i retained the stock gear box, and that's how i mounted it to the jet. It would be nice to use the stock motor at the 3000 kv, then a smaller prop would be no problem, and then i would really have to watch how much the props are pulling in terms of amps. Has anyone been able to use the motor without the gear box? I guess you'd either have to replace the shaft with a longer one, or remove the gear on the original shaft and just make it work somehow?? Thoughts?
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Post by mythotical on May 18, 2011 6:17:12 GMT 1
Direct drive can be done just use the Stryker f-27b prop 7 or 8 cell nimh is a 6x3 and 3 cell lipo is 5x3, and the prop adaptor.
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