Re: Q-1 - How much Hp is needed <jtenhave@...>


has your project flown at all? If not, you might want to consider reducing
the variables somewhat by either purchasing an Onan firewall forward
package( they are not exactly a sought after commodity) and using that to
debug the airframe, learn to fly it and then or parallel to that effort
develop the new power plant.

If the airframe is a proven performer, have a look at one of the back
issues of "Contact" which describes Leon Davis's conversion of the engine
to which you refer - it will save you a great deal of grief. ( he is a
pretty smart engineer and did nice work on that project)

A final comment on low HP powerplants. a 2 hp degradation in performance
is not much normally, but if the engine is only good for 20 hp it is a 10%
reduction so maintaining optimum tune is extremely important. Higher HP
engines are a bit more tolerant of being slightly off song. Performance
is closely related to power to wieght ratios. If you want the best from the
power available, get the weight down and keep it down. Too often the
decision is made to put a more powerful engine in to compensate and the
attention to wieght saving is relaxed. The net result being that much of
the anticipated gain is lost.

The number of times I have been outclimbed by an otherwise identical Q1
flown by a pilot 20 kg lighter than I ( the fact that he was a much better
pilot had absolutely nothing to do with it ;-)) are too numerous to
mention. That said, the life of an anorexic midget is not for everyone....


-----Original Message-----
From: BD5ER@... [SMTP:BD5ER@...]
Sent: Tuesday, January 01, 2002 12:19 PM
To: Q-LIST@...
Subject: [Q-LIST] Q-1 - How much Hp is needed

I'm planning on picking up my new project next weekend and would
of like to have it flying about the same time that my brother gets his
in the air. I have not yet decided on the "proper" power plant but I have
run across a 22 Hp V2 that, weighs a bit less than the Onan (minus
and fluid), has a nice flat torque curve that peaks in the right spot for
direct drive, is affordable, - but is only 22 Hp.
I will normally fly at high density altitudes and at high gross and
know that even the high horsepower versions of the Onan were not really up
the job. What I would like is some feed back (or even speculation with
attached) from some current or former Q-1 pilots on just how much Hp is
Will also entertain alternate powerplant recommendations - excluding
stroke. There is nothing wrong with a 2 stroke in a Q-1, but it's just not
for me.

Think outside the box......Fly in the envelope

Leon McAtee
Q-2/turbo VW Rabbit GTI/G-60
Q-1//3 Cyl Diahatsu Diesel?????????????????????????????

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