> ->> Speaking of nitrous in the 13B, I'm putting my 13BREW back
together as a

 NA motor, but would like to have nitrous for those real short fields. Don't
 think I would ever need it, but it might be nice to have on those rare
 occasions. I'd only be interested in getting about 40-50 extra hp. Would
 this be a risky proposition-I've heard that nitrous can be really hard on a
 rotary, but Ken Welter uses it. I suppose that if there is a controllable
 propeller available when I get to that point in my project, the issue of
 putting nitrous on my plane will be moot.
 >> Brian Trubee

John Cowpinski wrote:

 Brian, I'm with Ken on the virtues and safety of nitrous. One interesting
 site is www.nitrous.info with some good background and ideas on building
 your own.
 Now about nitrous vs psru ratio, one thought is you tune your engine /prop
 combination (whatever the ratio) to normally give a max of maybe 6000. Then
 design the nitrous setup to give you 65 to 7000. To some extent just use the
 ratio to select prop rpm for the diameter you want to run and plan to keep
 normal max down.
 Aren't you going to get much more additional HP by feeding in more fuel/O2
 to boost the rpm than lower gearing to boost it?
 John.

  From Ken Welter
   I have run up to 100 hp nitrous jets without any problems so 50
would be no problem at all. The main advantage is it lets me set prop
at cruise pitch yet I can get it out of the water or out of a short
field. I would highly suggest using the NOS brand system or at least
their nozzles and jets as their jetting charts are dead nuts on and
there is no experimenting about it. Just bolt it on and it works.

 
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