> Found the gasketing material; I'll be fitting it onto the slide throttle
> Saturday morning.
>
> I'm now investigating how to make the mechanical linkage between the
> slide throttle and the throttle handle. Any notional ideas for what I
> might fab for this? The slide throttle requires roughly a 1 3/4" throw
> between full open & full closed - so clearly I'll need a bell crank of
> some sort. If there's something that does the job I can simply order
> from McMaster Carr, then I'd probably go that way. Otherwise, I'll need
> to design something I can mount onto the existing slide throttle
assembly.
>
> Mark Supinski
>
> Order a 10-32 throttle control cable from AC Spruce
> Pages 152 153 and 154 in the 2004 2005 catalog. Part # A1760
> (877) 477 7823 I would get the catalog first if you don't
> have one. No bell crank required drill two holes.
> One in the instrument panel and one in the firewall.
> They come in 3, 4 or 5 foot lenths. You need to make a
> bracket that bolts around the water pump for the 10-32 end
> of the control cable. 3D for the new people.
>
> Paul Lamar ...No rotor no motor.
Actually Mark is quite right - 1 3/4" of travel is insufficient. Having
been there done that, the travel needs to be doubled to have a reasonable
throttle "feel." The simplest method of accomplishing this is IMHO to
redesign the slide throttle to be two inches shorter, reverse (flip end
for
end) the slide throttle to work as push (extend) to "OPEN", include in the
design a pivot point at one of either front corner to allow the
installation
of a throttle pivot arm, and include a throttle cable attachment point
along
one long edge of the slide throttle. The throttle cable pushing on the
pivot arm doubles the travel of the slide throttle.
Terry Adams
Thorp T18C
Well first it is 2 inches travel and not 1 3/4". Second there are a
zillion successful throttle cables out there with only 3 3/8th" total
travel. It is an aircaft standard. Third they are vernier with a
small twist of the knob the throttle cable moves just a few thousands of
an inch. The part number I specified above is such an animal.
The cable is attached where it is to apply the force through
the center of slide resistance. To attach it anywhere else
will cause a tilting force on the slide.
However the easy way is to put a pivoting left side throttle lever in
the cockpit like a Piper Cub and attach the push pull cable half
way up the lever to double the travel. Not redesign the slide
throttle.
Sorry to disagree but it is about time we flew this p-port
engine. Redesigning the slide throttle after the 11th iteration is
out of the question.
Paul Lamar
I would recommend that one not close the throttle slide completely (2")
otherwise the engine will have no induction air. Secondly, I would highly
recommend that no one ever use a vernier control for a throttle control.
The time when one needs immediate full throttle is not the time to be
attempting to also push in the release button on the vernier. And that is
not just my humble opinion.
Terry Adams
I have been flying an airplane with a vernier control for 30 years
and never noticed a problem. In fact I almost never need immediate
full throttle. I also almost never fail to land the first
time I try. I slip if I am too high and need to get it on the
numbers. I also make a habit of coming in high as it is always
safer than dragging it in.
Only once in a blue moon does somebody pull
out in front of me when I am on short final. In that case she
turned her radio just before she took the active. I can only
remember one time when I suddenly needed full throttle and that
is when she pulled out in front of me and even then I had more
than 30 seconds to apply full power. Pressing the button was no
problem. It becomes subconsious and automatic with your thumb
when you want to reduce throttle to land. Zillons of people have
been flying vernier throttle for many years and this is the first
time I have ever heard anybody complain about them. I think
if you fly them for awhile they become automatic.
Do you fly aerobatics? I don't so I don't have a clue
about that.
Anybody else on here have a problem with vernier controls?
Paul Lamar ...No rotor no motor.
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