Model Boat Mayhem

Technical, Techniques, Hints, and Tips => Other Technical Questions... => Topic started by: colin-stevens on June 02, 2006, 06:38:29 pm

Title: props
Post by: colin-stevens on June 02, 2006, 06:38:29 pm

some time ago i posted a request for help. it was how to get some oomph out of my 1/24th Arrezo. i was running it on plastic props, only temporarily till i found the size i needed. big mistake someone said go over to brass so i bought the biggest i could fit on. what a difference. about 300%. plenty of power, needs it for turning. just too fast now. ever seen a landing craft tow a water skier! moale, plastic props are no good.
so heres the question. i want too slow it down, dropping to 6v is too much of a loss of power, it wont turn. soo it needs torque. if i drop down too a smaller prop, but make it 4 bladed, will that keep the power but lose me a smidgeon of speed ? does that make sense?

ta

Title: Re: props
Post by: colin-stevens on June 02, 2006, 06:48:31 pm

heres some photos

Title: Re: props
Post by: Eddy Matthews on June 02, 2006, 06:50:42 pm

That looks really nice Colin, is it the Sirmar semikit? It's a vessel I've always fancied doing, so your comments on it would be welcomed...

Regards
Eddy

Title: Re: props
Post by: colin-stevens on June 02, 2006, 09:33:47 pm

no its not the sirmar. he's is at 1/35th, mines at 1/24th, scratch built. However i have built another one using sirmars hull only. The plans, by jecobin are some of the best of his that i have seen, loads of info. go for it.

Title: Re: props
Post by: Eddy Matthews on June 02, 2006, 09:37:21 pm

How big is your model at 1:24 scale Colin? Are the Jecobin plans drawn at that scale?

Regards
Eddy

Title: Re: props
Post by: colin-stevens on June 02, 2006, 09:57:58 pm

she's about 50x14 inches, weighs a ton. the plans are at 1/35th. spend ages measuring and applying a scale factor.

Title: Re: props
Post by: Shipmate60 on June 03, 2006, 01:18:03 am

Go for smaller brass props, and talk to Simon at prop shop.
If you want to keep the motors go for smaller props.

Bob

Title: Re: props
Post by: dannymax on June 22, 2006, 12:39:05 pm

what about changing to 3 blade brass props..

Title: Re: props
Post by: Shipmate60 on June 25, 2006, 12:03:45 pm

Or drop the voltage.
You can also try and turn down your speed controller,
My favourite one though is to run on the trim tabs or small movements on the throttle stick and asill use the power for turning!!

Bob

Title: Re: props
Post by: ron h on June 25, 2006, 02:46:50 pm

WHAT MAKE ARE YOUR THE PROPS YOU HAVE.

Title: Re: props
Post by: Tug on June 25, 2006, 05:29:45 pm

Or if you use electronize speed controllers, you can adjust them for the top speed you would like?

And if you cook them, they are repairable..... buddy good reason sez I. [having cooked one]