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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi all,
Thanks for all the advice and info, all very helpful to a newbie!
i certainly will install prop shaft supports on the 5mm shaft and get the correct size motor!
Thanks Again
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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hi Dave M,
well that was good info on the Lipo's i was going to put them in Parallel But certainly won't now! i will use one and then swap over when necessary as you suggest,Thanks!
As far as the 500 watt motor is concerned, i have not purchased it as yet but as a previous post stated that i need a smaller wattage than 500 , i will carry on looking for a smaller wattage and low KV size motor, although all i seem to find are are very powerful ones!
even on the web sites named in the post but i will phone them in the morning and ask.
the Boat does have a keelson, a piece of angled wood below the hull and also one inside the boat and this shows about 1 1/2" of tube either end of the shaft to fit the supports.
Thanks
graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi,
i have searched for a 500 watt 500kv motor and just can't find any, what company do you use for motors?
at last i think i found a suitable Motor, i hope, it's a keda 36-42m 500 watt 950 kv, with a 5mm shaft and fits my new 5mm to 5mm coupling, so don't need any other parts for the power train! will need to change the hole to hole distance to fit the 16mm spacing of the new motor.Then gluing the new 5mm Shaft in, i think thats a good setup.
The new 500 watt motor should have a long running time i guess on 10000 mah Lipo's?
Anyway thanks again for helping me, very much appreciated!
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi all, what do we all think of the Graupner 500 ECO? it only does 7500 rpm but high torque, about 1500 watts, 14.8 volts. The say it is especially built for boats. I would like to know your thoughts on the small outrunner motor?
Regards
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi all,
Wow! so much info to take in, all excellent information though!
How do i get the old shaft out of the boat? it's well epoxied in down nearly the whole length!π€
Thanks again
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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hi all,
so what wattage is the Graupner 500 ECO, can't find the Amps.
how do you know what ESC Amperage to buy?
Regards
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi Mark,
i have a 4mm shaft fitted and the boat was out of the water at the time, it happened when i just touched the throttle!
i thinking maybe a 5mm shaft would be good (less whipping)with a racing propeller and a 1100kv motor with a rubber heavy duty coupling, i think that would be a good setup and will be suitable for a 3ft boat. i think the brass propeller is just not built for high revs, or was it a 1 off badly made propeller?
anyway would that setup be good?
thanks
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi All,
a lot of info, i need a complete change to the power train setup.
canabus setup looks good, i think i will follow that. what size in diametre prop shaft did you use, 4 -5 mm?
have uploaded some pictures of the boat, complete with offending motor! and 1 of the resulting damage to the 3 blade brass propeller, which i think was out of balance, so, can't take the speed of rpm? probably need a racing propeller? There is room for 2 lipo's in parallel.
Thanks Again
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi Mark,
i don't have excess to a lathe, do they sell prop shafts already loaded with bearings? or racing props?
Thanks for your help
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi Boatshed,
i have just ordered today, an aligner tool for when i rebuild the prop shaft, i didn't know they exsisted when i installed the prop shaft the first time! But the prop-shaft does seem to be inline to the motor spindle..... and the prop shaft is straight, so i think maybe the propellor was out of balance.
but i think i will reduce, the next motor KV size to about 1100kv - 1300kv.
Thank everyone for their help, very much appreciated!
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi Mark,
The Prop shaft is 14.5 " long.i don't know the make but it's the normal prop they sell with brass bushes. i have just taken the shaft out of the prop Tube to see how bent it might be but it looks very straight to me and if push it through the tube it buts up to the middle of the motor spindle and seems inline to the motor spindle.
i can't see how i could fit an extra bush into the tube.
can you recommend a prop with bearings that would do and where to order from?
Thanks
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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hi Richard,
Thanks for the info, i have decided to remove the Prop and check it for straitness, before i start again with rebuilding using a heavy duty coupling and a slower motor, as i think the existing motor is just too fast at 47000 rpm for the propshaft and coupling and if the propellor is slightly out of balance then the prop will come off again!
Thank you Richard and all other contributors that have helped!
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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Hi,
Thanks for the info Peter and Dave, very much appreciated!
The hull is all wood. I will order an 1100kv motor and make sure there is Thrust Washer's on the Propsharft.
Thanks again
Graham
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π Too Powerful Brushless ?
6 years ago by
π¬π§ Traiderman (
Leading Seaman)
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hi all,
i have a problem with my prop shaft, every time i start the Hobbyking Brushless 3660SL (3180 KV ) the prop shaft comes adrift from the boat hull. it's powered by a 14.7V Poly Lipo battery.
is it too powerful for an Aeronault Queen 36"? or is the prop shaft vibrating because of out of balance propellor or the coupling?
i have used Heavy Duty Araldite to glue the prop shaft on to the boat. it has come adrift 2 times now.
Thanks for any help i may receive - Graham
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