Model Boat Mayhem

Technical, Techniques, Hints, and Tips => DC Motors (Brushed) and Speed Controllers => Topic started by: john44 on June 09, 2013, 07:00:55 pm

Title: Speed 700 Turbo
Post by: john44 on June 09, 2013, 07:00:55 pm

Hi guys, could anyone out there tell me what is the maximum
size of 4 blade prop I can fit on a Graupner Speed 700 BB
Turbo 9.6v. I intend running on 12v.

john

Title: Re: Speed 700 Turbo
Post by: Tug-Kenny RIP on June 14, 2013, 03:50:10 pm

It really does depend on the weight of the object being pushed. What do have in mind ?


ken

Title: Re: Speed 700 Turbo
Post by: john44 on June 14, 2013, 08:12:04 pm

Hi Ken welcome back, glad to hear you are O/K.
the boat in mind is a 4 ft 6" air sea rescue.

john

Title: Re: Speed 700 Turbo
Post by: Tug-Kenny RIP on June 14, 2013, 08:16:49 pm

Thank you.

If using 4 props then I would think 40mm would do nicely for this model.  If you reduce the diameter then the current consumption would decrease and battery life increase.

The 700 is a fast spinning motor so smaller props might be better.
Hope this helps


ken

Title: Re: Speed 700 Turbo
Post by: john44 on June 14, 2013, 08:20:31 pm

Thanks for the prompt reply Ken. :-))
I was only going to run it on 2 props.

john

Title: Re: Speed 700 Turbo
Post by: Tug-Kenny RIP on June 14, 2013, 08:22:55 pm

Yes, I would test her on 40mm first to see how it goes.     :-))


ken

Title: Re: Speed 700 Turbo
Post by: Stavros on June 14, 2013, 10:04:04 pm

Personally i wouldnt run 4 bladed props on this motor you will kill it....this motor needs to rev so 2 bladed would be the way ahead starting with 35 mm and go up to a max of 55



Dave

Title: Re: Speed 700 Turbo
Post by: crock on June 15, 2013, 12:16:20 pm

Hi, following advice on here, I run a 37" Perkassa with the 700 turbo and a X45 prop on 14.4V.  Goes at what I consider a nice scale speed having seen an old movietime(?) film of the original where it 'don't 'alf go' !!  :-)   Running on 12V should give quite a nice scalish speed ...  ???

Title: Re: Speed 700 Turbo
Post by: john44 on June 15, 2013, 05:36:11 pm

Thanks for the advice lad,s

the perkassa looks nice crock.

john

Title: Re: Speed 700 Turbo
Post by: crock on June 15, 2013, 06:13:07 pm

I live on an estuary so the waves get a bit exciting sometimes   :-)