🚀 go-pugleaf

In article <1993Jan20.170730.4461@dvs.com> brooks@dvs.com (Walter Brooks) writes:

|I was thinking of a Cox Black Widow ('cause I like the name) but beyond
|that I'm not use what to use. What kind (size) of prop should I use?
|
|The Ridge Runt has the following characteristics (from box cover):
|	Weight: 22oz (I've got 2oz of lead in the nose)
|	Span:	50in
|	Radio:	2 channel (aileron and elevator)
|	Config:	T-tail with high wing

I would think 22 oz and 50 inches is a bit much for a reed-valve
.049.  At the least, I would think you might want a TD.  A better
idea would be to try a Cox .09 instead.  That would use a 7x4 prop
or so.  An .049 uses a 6x3 or 6x4 or thereabouts.

If you go with the larger motor, you might want to consider three
channels, to give you throttle control (and use an RC 09, like the
Enya Pet).  Consider beefing up the nose quite a bit, using balsa 
doublers (soaks up vibration better than ply).  And watch out for 
the tail to shake apart from the extreme turbulence off the 
spinning prop, that isn't experienced in a glider.  You might want 
to add a bit of fuselage bracing just fore of the rudder, and some 
extra bracing at the rudder/stab interface.

Also, watch out if it comes out much heavier than 22 ounces, as 
the wings may not be strong enough to withstand the extra weight 
at high G's.  

Good luck with your project.

			Dave Svoboda, Palatine, IL