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I understand your point, Hans. But until there is
somebody offering a governor package suitable for mounting on a rotary, I don't
think Tracy is interested in increasing the production cost of drilling the
required hole. Not to say, if someone was really keen on experimenting
that Tracy couldn't be talked into drilling the required hole - but, my guess is
that unless he felt there was a market, he would not be inclined to add that
design feature.
But, then I'm not Tracy's marketing manager and could be
all wrong about that {:>)
Ed
----- Original Message -----
Sent: Tuesday, December 19, 2006 11:20
AM
Subject: [FlyRotary] Re: hydraulic
constant speed prop for rotarys
Tracy doesn't need to build anythinig with a pump, the governor will do
that. We need a psru whose front end matches the current engines build
for a CS prop. The rotary should be good for the as the "crankshaft" is
already hollow and supplied with oil.
Hans
On 12/19/06, Ed
Anderson <eanderson@carolina.rr.com>
wrote:
Bill,
Tracy considered doing that at one point. I believe
when he realized most Hydraulic controlled props required much higher oil
pressure than the 60-70 psi our oil system produces, he decided
he didn't want to have to produce a Prop controller to provide the required
oil pressure.
Here is a excerpt from the MT propeller site regarding
hydraulic pressure typically required.
The servo pressure necessary for changing pitch is
generated by a gear pump located inside the propeller
governor, which increases the oil pressure supplied by the
engine by factor 6 or higher.
Ed
----- Original Message -----
Sent: Monday, December 18, 2006 11:46
PM
Subject: [FlyRotary] Re: hydraulic
constant speed prop for rotarys
Dave, if you go with a Mistral PSRU you can run any Hyd/CS you want.
I'm supprised Tracy hasn't gone to a hollow shaft on his PSRU since he
runs a big plain bearing he could set up a port for a CS prop.
Bill Jepson
HEY! That's like saying that the store is giving out free ice
cream but not telling us which store.. :-)
Dave Leonard
On 12/18/06, lou
rubin <
grdflyguy@yahoo.com> wrote:
While
we are on the subject of props I want to bring
to the groups
attention we are installing a constant
speed hydraulic prop on a
SA2 hub with Tracys 2.17 RD
The prop is very similar to MT design
except its about
half the price & actuated hydraulically
instead of
electrically. Im the past we havnt had any other CS
prop options except the electric because we dont
incorporate a
hollow crankshaft as our Lycoming &
Continental cousins . We
are mounting the prop on a
20B in a Lancair ES
however, it could be just as
easily installed on a 13B
as well We will keep you
posted on our progress
We will be
selling our IVO Magnum if there is anyone
interested & possibly
the 2.17 RD in the
future
Lou N117ES
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