Topic: springer type tug rpm and prop (Read 1396 times)

jabba · « **on:** September 22, 2009, 09:15:52 AM »

hi guys
need to know if this motor and gearbox will fit and which prop i use,
mfa 5 pole 980D61 (4.5v - 15v) WITH RE 385 MOTOR. RATIO 6:1
i think its around 2000 rpm at 12v.

http://www.mfacomodrills.com/gearboxes/980d_series.html

if this don't work what will ?

thanks for your help and love the site.

craftysod · « **Reply #1 on:** September 22, 2009, 10:59:16 AM »

No need for a gearbox,540 motor with 50mm prop on 6v,is fine

HS93 · « **Reply #2 on:** September 22, 2009, 11:02:32 AM »

Quote from: craftysod on September 22, 2009, 10:59:16 AM

No need for a gearbox,540 motor with 50mm prop on 6v,is fine

and it doesent get hot? must have no pitch on it I would have thought I would have thought 35mm was more like it.

Peter

craftysod · « **Reply #3 on:** September 22, 2009, 11:03:55 AM »

It does get hot thats why i got water cooling in them
Mark

nick_75au · « **Reply #4 on:** September 22, 2009, 11:52:57 AM »

Hi,
The best speed is around 6000 rpm for the standard 1 1/2" 40mm prop in a Springer, this will give you excellent power without overdoing it, if your building a more scale like vessel then 4000 rpm might be more appropriate. If your using a larger prop then reduce the speed, the motor you have mentioned is too slow unless the boat has a 4" 100 mm prop.
Regards
Nick

jabba · « **Reply #5 on:** September 22, 2009, 10:50:51 PM »

thanks for info guys,will get a motor around 6000rpm.

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Author Topic: springer type tug rpm and prop (Read 1396 times)

jabba

springer type tug rpm and prop

craftysod

Re: springer type tug rpm and prop

HS93

Re: springer type tug rpm and prop

craftysod

Re: springer type tug rpm and prop

nick_75au

Re: springer type tug rpm and prop

jabba

Re: springer type tug rpm and prop