How to mount a 4mm prop on a 3mm shaft?

gobigkahuna · Jan 08, 2010, 06:37 PM

I would like to adapt a boat prop (probably a Gaupner 40mm diameter intended for a 4mm shaft) to an aircraft 3mm shaft, any suggestions on an easy / cheap way to do this? I was thinking along the lines of a very thin brass shim, but I don't know where I might find .5mm thick brass cheaply/easily. Any other ideas?

Ghost 2501 · Jan 08, 2010, 07:12 PM

gobs it wont work. time for a new shaft, they're not that expencive $10 for a 12" shaft

gobigkahuna · Jan 09, 2010, 02:58 AM

No, the shaft of the motor is 3mm and all the props I've found are for 4mm shafts and I want to mount the boat prop directly on the motor's shaft (or use as short an adapter as possible, this is going to be used in an ROV project BTW).

Grauen Wolf · Jan 10, 2010, 01:52 AM

Try www.wmberg.com
in their on line catalog/products click on couplings then shaft adapters,choose metric first then under"type" choose shaft adapter the pdf file shows an adapter with a female 3.0mm i.d. and 4.0 male or o.d with a 11.0mm length stock 3SAM-10 If you don't go to the pdf file it shows 3mm X 3mm I don't know why. Is this what you need? It will also need clamps. they got them too. Good helpful people, products a little pricey not too bad.
Ted

gobigkahuna · Jan 10, 2010, 07:15 AM

Thanks, that's a great resource. You wouldn't happen to know where I can get plastic Graupner 3 or 4 blade 60mm props for a straight (no thread) shaft, would you? I used them in another project and would like to use them again in this one (so the parts would be compatible) but can't find them anywhere.

Jan 08, 2010, 06:37 PM	#1
gobigkahuna Registered User North Carolina Joined Nov 2008 388 Posts	How to mount a 4mm prop on a 3mm shaft? I would like to adapt a boat prop (probably a Gaupner 40mm diameter intended for a 4mm shaft) to an aircraft 3mm shaft, any suggestions on an easy / cheap way to do this? I was thinking along the lines of a very thin brass shim, but I don't know where I might find .5mm thick brass cheaply/easily. Any other ideas?

Jan 10, 2010, 01:52 AM	#4
Grauen Wolf Registered User Joined Nov 2009 31 Posts	Shaft adapters Try www.wmberg.com in their on line catalog/products click on couplings then shaft adapters,choose metric first then under"type" choose shaft adapter the pdf file shows an adapter with a female 3.0mm i.d. and 4.0 male or o.d with a 11.0mm length stock 3SAM-10 If you don't go to the pdf file it shows 3mm X 3mm I don't know why. Is this what you need? It will also need clamps. they got them too. Good helpful people, products a little pricey not too bad. Ted

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Jan 08, 2010, 07:12 PM	#2
Ghost 2501 no wings any more, just dust! stoke on trent Joined Oct 2004 7,994 Posts	gobs it wont work. time for a new shaft, they're not that expencive $10 for a 12" shaft

Jan 09, 2010, 02:58 AM	#3
gobigkahuna Registered User North Carolina Joined Nov 2008 388 Posts	No, the shaft of the motor is 3mm and all the props I've found are for 4mm shafts and I want to mount the boat prop directly on the motor's shaft (or use as short an adapter as possible, this is going to be used in an ROV project BTW).

Jan 10, 2010, 07:15 AM	#5
gobigkahuna Registered User North Carolina Joined Nov 2008 388 Posts	Thanks, that's a great resource. You wouldn't happen to know where I can get plastic Graupner 3 or 4 blade 60mm props for a straight (no thread) shaft, would you? I used them in another project and would like to use them again in this one (so the parts would be compatible) but can't find them anywhere.