Which props to use for Astro 25 4 turn in hydro?

[riggerman]

I have a Astro 25 4turn motor running on 12 cells i want to put in my Doug Campbell roundnose hydro which props should i be trying out? Any info would be great. Regards Andris Golts.

 

[JimClark]

The carbon fiber graupner 45mm sor maybe slightly smaller would be a good starting point

Jim

te name='riggerman' date='Oct 15 2006, 05:04 PM' post='166024']

I have a Astro 25 4turn motor running on 12 cells i want to put in my Doug Campbell roundnose hydro which props should i be trying out? Any info would be great. Regards Andris Golts.

 

[BoatDoc]

what prop are you currently running? i know of a few that work well on the cambell shovel, but they were being spun by an SS1, not an astro.

 

[DJ Campbell]

Hi Andris.

I've had no experience with that motor on my hull. I believe that motor is used by the 10th scale folks in seattle. They usually run X447 props. However, they run larger hulls too. Usually at least 32" long. I would try a smaller prop initially. I've had some good runs on an 8XL brushless using an X437 3 blade, then try working up to a 440 3 blade and see where the heat temps are at. That motor may be comparable, but I'm not sure of the torque/rpm numbers on the Astro.

 

[Andrewg]

Andris

Hey are you back in electric racing?

Thats great !

I saw one of your riggers at the pond last weekend.

The props used withthe 25/4 were X435 X637 - X642. On mine I found that was the limits before the motor was too hot - and I think that was with 2000's !!! The 4 is hotter than the 5 the 1/10's like.

I would be concenred about running 3000 plus through one, on the other hand you just never know.