Which Propeller?

[Rick DevonshireParticipant @rickdevonshire]

I am currently constructing a 34″ model of the RAF Crash Tender (from an original Aerokits plan – a retro project). I am using twin 545 motors to power it and would like to ask members advice on which propellers to use – 2 bladed or 3 bladed and of what diameter?

It is interesting to note that the full size craft had both motors rotating in the same direction.

Rick Devonshire.

[Rick DevonshireParticipant @rickdevonshire]

Choice of propellers for my RAF Crash Tender.

[ashley needhamParticipant @ashleyneedham69188]

Rick. As an interim suggestion, waiting for someone to reply who has built something similar, I  suggest a pair of nice brass three bladers would suit. They look nicer than plastic ones and generally have more pitch than said plastic items. As to size… I would have thought 35mm would suit the motors, assuming they are standard 540`s. I would also have thought that a prop in the 30-40mm bracket would look about right on the model. Its worth bearing in mind that the prop  has to suit the motor more than the boat, so if you want a slightly larger prop then perhaps a pair of 600 can-types might be a better match. Does the plan not indicate a size???   I am not a fan of two blade types unless its for outright speed.  Ashley

[Rick DevonshireParticipant @rickdevonshire]

Thanks for your suggestions Ashley, I think I will probably start off with a couple of plastic ones initially then go for brass when I see how things go, as brass can be rather expensive. The plan being of 1950’s vintage indicates a 3.5cc i/c engine, rather messy and not welcome on many lakes these days.

Rick.

 

[HS93Participant @hs9317166]

Have a look on the  http://modelfireboats.com/   there is a section on setups and what people are using whith what prop so no guessing plus lots of othere info

 

peter

[ashley needhamParticipant @ashleyneedham69188]

In my experience its no good trying plastic props and then going on to brass ones as the characteristics are very different. I know thats not much use to you but there it is!  Ashley

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