I have Goodyear 8.50 tires and couldn't find aircraft tubes with 90* stems. At the suggestion of Alaskan Bushwheel I got aircraft tubes, cut off the stems and glued on 90*stems (purchased from A.B.). Haven't flown yet, but they have held air for a few years in my garage.
Jesse
Date: Mon, 18 Jan 2010 14:21:20 -0500
From: klehman@albedo.net
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Fw: Instability
Hello Albert
Well you have taildragger time so lets rule out pilot self induced
excitement. As they say "if the rudder is not moving -it is about to get
exciting".
So the problem is only when the tail is on the ground? Or both?
Conventional gear?, bungees?, die springs? or cessna type spring gear?
I seem to have better control if my rudder to tailwheel springs are not
loose but not everyone agrees. I have MAM's screen door compression
springs not the Scott tension springs. Cutting power with the tail in
the air on takeoff is very challenging and exactly why so many high
speed taxi tests end badly. I don't recommend doing it intentionally. Do
you have the recommended 25* of rudder throw in each direction? My rebel
is not at all squirrelly like yours seems to be. It is very rare that I
need a touch of brake to keep it straight.
If tailwheel shimmy is an issue I also find a vertical pivot helps but
you didn't say anything about shimmy.
Excessive toe in or toe out can do the crazy things you refer to by
extending and compressing the suspension. A bit like a pogo stick.
Raising the tail also changes the toe if the camber is not zero (axle
not horizontal). Changing the length of the drag strut if you have one
certainly also changes the toe. So suggest you measure toe with tail on
ground and also with tail raised.
Tire pressure doesn't make much difference for me other than when I
don't have any. I'm up to 5 flats now with the crappy Carlisle bent stem
inner tubes... Usually it is one of the little manufacturing
irregularities that starts leaking for no obvious reason other than poor
quality.
Ken
Mike Davis wrote:----- Original Message -----
From: "Rebel" <rebel@dcsol.com>
To: <mike.davis@dcsol.com>
Sent: Monday, January 18, 2010 6:15 AM
Subject: Instability
Hi
I own a Rebel series 615-R, equipped with 2.2 liter Subaru engine, with
serious stability problems while on ground.
-During taxing, tends to move to the sides.
-While on take-off run, at full engine, the instability diminishes and its
possible to take-off without problems.
-But, if during the take-off run the power is cut, the plane becomes
extremely unstable and it becomes impossible to keep it going staight on
the
runway. Generally it ends up off the runway looking to where we were
coming
from.
-To sump it up, if the plane is at speed but without traction it becomes
completely unstable while at ground.
-Ive got experience with planes of conventional layout, but its the firs
time
Ive met such an unstable one. The rear wheel is in perfect conditions and
has
been recently lubricated.
Is there a special aligning for the wheels, some specific tire pressure or
some
other element I should check or modify ??
Thanks
Albert
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