🚀 go-pugleaf

In article <1993Jan11.044646.13055@c3177208.ssr.hp.com> bill@ssr.hp.com (Bill Chidester) writes:
|Chris (cbusch@ub.d.umn.edu) wrote:
|
|: to ducted fan engines, how do they work? If there are rc jet engines,
|: are the jet engines pulse jet or normal turbine jets?
|
|  There are ram jets available, but nobody in their right mind will fly
|  them.  As near as I can tell, 49% of the energy emitted is heat, 50% 
|  is sound and about 1% is thrust.  

Those are not ramjets, those are pulsejets.  And you can keep your right mind 
to yourself. :-)

|  A ducted fan engine uses an extremely nervous reciprocating engine to drive
|  a multibladed prop (or fan) inside a shroud.  There are also stationary
|  blades which serve to "unscrew" the air, resulting in a more laminar airflow

Laminar?  I think not.

|  Trainers should be like first girlfriends.  You will learn a lot more with
|  one that's big, cheap and slow than you will with fast, good looking and
|  expensive.

Well, aside from the distateful sexism of that remark, he is right.  Leave the
ducted fans for a while.

On the other hand, a really fun little airplane that could be a second or
third airplane of a talented student is the Fantrainer.  From MAN plans,
the little airplane uses a Cox TD .049 and a three-bladed pusher prop in
a little shroud.  While not good for rank beginners, it is small, and
cheap, and easy to scratch-build.

		Dave Svoboda, Palatine, IL