Twin engine pattern

[Ron Van Putte]

On Aug 7, 2004, at 8:53 AM, mike mueller wrote:

>  I've seen an older plane called the Dualist that's a 60 sized 
> patternlike twin but has anyone ever attempted a larger scale twin 
> plane? I have an engineer friend that has this idea that an electric 
> (outrunner) twin with counter rotating props would be worthwile 
> experiment. I'd like to support his experiment but I'm pretty 
> sceptical about it's possible merits. Can a twin plane fly like our 
> current designs? Any thoughts on this would be appreciated from the 
> vast knowledge you guys have.

I can't comment on experiments of a larger twin electric motor scale 
airplane, other than to mention a common problem that I've witnessed 
with brushless motors used on twin motor aircraft.  The current 
controllers I've had experience with cannot handle twin brushless 
motors over the whole motor RPM range.  However, a local R/C electronic 
designer (he designed many of the circuits sold by Radio South) was 
called upon by a local modeler who had this problem.  The electronic 
designer has produced a circuit which will permit control of  twin 
brushless motors over the whole motor RPM range using currently 
available electronic speed controllers.  The 'brassboard' circuit works 
extremely so well that the circuit is being considered as a potential 
product to be sold to the general public by the fabricator of all the 
Radio South electronic products.  He doesn't know what the market 
demand for this product will be.  I told him that the demand could be 
very large.

Please comment on the level of interest in such a product.  The 
fabricator is reluctant to identify himself at this time due to the 
potential flood of 'nuisance' e-mails this might generate.  I will 
forward any responses to him,.

Ron Van Putte 
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