| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 365.1 | Shuttle Trouble | SPKALI::THOMAS | | Wed Jan 14 1987 12:31 | 16 |
| A guy in my club has a shuttle and has exploded it three times.
The problem happens when landing as the rotors begin to slow down.
one of the two rotors will flex down and strike the tail boom and
it's pieces all over the place. He thinks that he has found the
problem. He said that the rotor pitch set up has some slop in it.
The set up for pitch control is a neutral position that allows
both positive and negative pitch inputs from this neutral position.
His theory is that as the rotos slow and pitch is reduced to neutral
the slop allows the rotors to actually go negation. If the rotor
still pocesses sufficient speed this then drives the rotors to a
max. neg. setting that drives the rotors downward. This in turn
causes the rotor to stike the boom. He plans to change the servo
setting to minimize the neg setting that can be input to the rotors.
He feels that the only adverse effect could be in the autorotation
on the chopper. ANY COMMENTS???
|
| 365.2 | Sources of info on the Shuttle. | MDADMN::EATOND | Dan Eaton | Wed Jan 14 1987 13:56 | 12 |
| Can't remember which mag it was in but there was an artical by Ray
Hoestler (sp?) discussing Shuttles self distructing occasionally.
The problem turns out to be the leading edge of the rotor blades.
The fix was filing off the sharp edge of the blades. I'll try and
find the mag and post it here later.
Another source of info is the lastest issue (Autumn) of RC Helicopter
Magazine. There's an artical on the Shuttle with several modifications.
I think they talked about tightening up the rubber o-rings to eliminate
blade slop.
Dan Eaton
|
| 365.3 | More on Shuttle problem. | MDADMN::EATOND | Dan Eaton | Thu Jan 15 1987 10:15 | 10 |
| re: 5.1,5.2
Here's the Shuttle info I promised. The article is in the October
1986 issue of RCM on page 64. After I re-read it, it sounds exactly
like your friend's problem. One blade going out of track during
hovering or landing and smacking the tail boom. According to the
article, the sharp leading edge causes the blade(s) to be pitch
sensitive enough to cause the out of track problem.
Dan Eaton
|
| 365.4 | Stork update & the new Colt | MDADMN::EATOND | Dan Eaton | Wed Feb 25 1987 14:09 | 22 |
| I finally got some more info on the Stork. The owner has had it out now
for a couple of test flights and reports that it flys like a dream. Very
responsive and yet stable in hover. Says he hasn't found anything he doesn't
like about it yet.
I got to see another new helicopter last night. This one is the Colt from
Japan. Don't know the company that makes it but they use a lot of Kalt parts.
The Colt is another beginners copter. Fixed pitch rotor, "plastic" side frames,
and come 65% completed. Uses a 50 to 60 size engine. The shop owner has had
it out hovering and was surprized by how stable it is in hover. No forward
flight logged on the machine yet. Most notable thing about it is the
humongus landing gear. No need to go out and buy Tuff-Struts for this machine.
The cross bars are made of 1/4" thich by 3/4" wide aluminum stock. Even the
strut tubes themselves are made out of thicker tubing than you normally see.
The thing must way a ton! The owner said that on the first flight he had the
engine too lean and the ship dropped from about ten feet up when the engine
stopped. No damage to anything. We all asked about the hole it made in the
asphalt where the skids hit. Does make you wonder where the force that bends
most landing gear on a hard landing ends up? This assembly didn't look like
it flex like Tuff-Struts.
Dan
|