Model Boat Mayhem

Mess Deck: General Section => Tugs and Towing => Topic started by: andyn on June 01, 2009, 10:10:47 pm

Title: Prop Size
Post by: andyn on June 01, 2009, 10:10:47 pm

What sized plastic prop for a 540 motor?

Will be 3 bladed one of these, or I'm very tempted to get a 5 blade for the hell of it, because it will look nice...

http://www.cornwallmodelboats.co.uk/acatalog/plasticm4.html

Also, does anyone make a very small water pump?

Title: Re: Prop Size
Post by: Stavros on June 01, 2009, 10:23:47 pm

Whats the tug


Stav

Title: Re: Prop Size
Post by: andyn on June 01, 2009, 10:26:03 pm

http://www.wearboats.com/apps/webstore/products/show/586420

Won't be tugging anything, just looking nice ;)

Tuned 540 motor on 6 cells.

Title: Re: Prop Size
Post by: Stavros on June 01, 2009, 10:31:00 pm

Taht size should be OK personally I would go for the Brass prop



Stav

Title: Re: Prop Size
Post by: andyn on June 01, 2009, 10:32:26 pm

So would I, if I had any money, spent it on the hull and propshaft...

Which size should be ok? Will the pretty 40mm 5 blader be ok?

Title: Re: Prop Size
Post by: andrewh on June 02, 2009, 05:08:54 pm

Andy

Deep inside you know that it depends on the load - ie the pitch of the prop
I'm running a s600 (550) with 40mm 2-blader  on 8 cells and the motor is not in the slightest bothered - I would say give her a try but it might prefer a low gear ratio like an olympus or 2:1 if its a tuned buggy motor

andrew

Title: Re: Prop Size
Post by: andyn on June 02, 2009, 05:50:39 pm

I've ordered both the 40mm five blader and a 40mm 3 blader, and we'll see how we get on :-))

Haven't even got the hull yet, it went in the post today apparently. I have all of the kit I need lined up for it on my bench.

Title: Re: Prop Size
Post by: craftysod on June 02, 2009, 10:28:27 pm

Andy going for a tug,what next
Dont tell me its going to be ic powered  {-)

Title: Re: Prop Size
Post by: andyn on June 02, 2009, 10:56:52 pm

SHHHHHH ;)

This year's springer of mine may be getting a Sikky engine, Hush Hush...

Title: Re: Prop Size
Post by: craftysod on June 02, 2009, 11:09:36 pm

On a serious note now,
If anyone else reading this post, about brass props.
If you get them of ebay,unless its a reputable dealer,dont buy.
I ordered 2 and they were broken when i received them,they were soldered and not cast.
Just to save you money
Mark

Title: Re: Prop Size
Post by: andygh on June 03, 2009, 10:05:34 pm

I've used many silver soldered props, none have broken  :o

Title: Re: Prop Size
Post by: More Coffee on July 12, 2009, 08:05:17 pm

On Bender ..my little tug ..i used a brass 4_blade Rivabo 45mm

550 can motor ..dual 7.2 volt Nimh packs in paralell

Title: Re: Prop Size
Post by: andyn on July 12, 2009, 10:23:40 pm

I've ended up with a VERY hot 540 motor (just because I had it) and a 5 blade 40mm. It reaches scale speed with a couple of clicks on the trim lever, aquaplanes at half throttle and can pull me in our very heavy rescue boat. All from a 24" tug...