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[HS93 (RIP)]

What sort of set-up would you recommend Peter? I don't want to go with gel-packs though,as they add too much weight to the boat,which just compounds the problem.

I would go with a 700bb 9.6v and run it on 14v two 7.2v packs try the 4.6ah if you can I would also think of a gear box for it one of the MFA ones we found that it stopped the motor over heating and we got a lot longer run time also something like a 30 amp electrononise speed controller we have been playing props and fortunately have a selection to try but always go smaller first and build up a small jump in size can pull a lot of amps so be aware we only ever do a small lap when testing yes its boring but bring it in and test temperature to make shore nothing is overheating, you will see cooling coils on the motors but they are not needed with the set up we are using so we should get a good life out of the motor plus they are about £21 now and cheaper if you look around. oh and we only use oil in the prop shaft after we saw the difference it maid plus the set does not req anything when sailing just for bench running..the gearbox is the way to go.. also as i said you can run at whatever speed you want nice and scale like and the odd blast to wake up the senses..

peter

[Dreadstar]

I've been thinking of going the gearbox route,but is there anywhere that you can just buy the boxes themselves,or do you need to buy a complete package?

David.

[HS93 (RIP)]

you can buy just the box these are the same gears as we use but we make up the other bits


http://www.mfacomodrills.com/gearboxes/960d_series.html

peter

[Dreadstar]

What gearbox ratio would you suggest Peter,to go with a 540 size motor?

[HS93 (RIP)]

the gear box I Posted a link to is for 700 motors which are about £20 ish pounds for a good 9.6v 700bb and you would run that on 2 to 1 with a 540 you would use a smaller gear box and it all depend on the motor as they are all different 540 its like saying medium sized car they are all different some fast some are skodas so I cannot help and you would get a lot less advantage going that size anyway. that is why sometimes going for something like a speed 600 of speed 500 from graupner you can look up the speck and if you melt it due to weed or over proping it you can get one the same revs and amps to replace it as opposed to some of the no name ones.

Peter

[Dreadstar]

Thanks Peter,I'm glad that there are so many knowlegable people on here.Food for thought,I'll look over the options carefully and see.

[red181]

thanks greggy its better now, different prop

Dread, my gearbox ratio is 2:1, mfa gears as HS93 has stated. Its not much quicker than direct drive, but way more efficient. With direct drive, it needed water cooling, with the gearbox fitted, motor etc is stone cold, does not need water cooling anymore, run time is better.
 Graupner motors, especially the 700 BB Turbo range are purpose made for rc use, and are pretty much bullet proof, providing you dont abuse them like I do
I run 19.2v, volts, for your boat I agree with what HS93 says , you dont want to go as fast as mine, if you have 2 packs and a link cable, then you can use both for fast running, and one at a time for general running, giving you more options

[Dreadstar]

Finally got my boat crewed,and just need to build a mounting frame for the dinghy now.