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Good planning Todd. My VS has no offset, but my mount does have 5/8" offset
to the left. I think a few washers will moving it to neutral or perhaps a
bit beyond.
In you case, I am not certain there is any great advantage to going to 2.85.
It is not exactly cheap. I estimate that the total investment will be
between $2500-$3000 for regearing and the new monster prop. Your turbo
installation appears to be working well so, in you case, I am not certain
your delta benefit would be commensurate with the cost.
While Tracy is still in the testing phase, I have asked him the same
question about effect on cruise economy. Thus far, it appears that to get
the same true airspeed under same conditions (at least with his aircraft)
that a 5% rpm increase is needed over the 2.17. This is the first tentative
look by Tracy and of course, things could change.
I must admit that my 7 years of flying my rotary powered RV has been
enormous fun and I am satisfied with the cruise and top end. But, the
prospect of increased takeoff and climb performance approaching what I saw
Tracy do was just to good to pass up. I had considered going turbo, but my
aircraft is slightly nose heavy as it is and 35 more pounds up front would
not have helped.
I clearly hang out with the wrong crowd at the camping area, have not seen
any gorgeous fiddle players.
Ed.
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "Haywire" <haywire@telus.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, April 24, 2004 5:29 AM
Subject: [FlyRotary] Re: 2.85 redrive
> While I didn't foresee the success of the 2.85 redrive, I did want to keep
> my options open, so I built the VS with zero offset and the engine mount
as
> well with zero offset and just use shims to offset the mount. This has
> worked exceptionally well, so I don't expect that there would be much
> difficulty in switching to the 2.85 if that turns out to be the
combination
> of choice for my needs. The question(s) that remain are, first how much
$$$
> to switch over? Second is, how will this perform for cruise economy? Third
> is, I already can outclimb any Lycosaurus at our field with using the
turbo,
> what's next?
>
> S. Todd Bartrim (probably shouldn't be making these claims while under
> the influence of barley :-) (no.... I wouldn't be the drunken guy snoring
at
> sun-n-fun, I 'd be the drunken guy hitting on the gorgeous red-haired
fiddle
> player :-)
>
>
> Turbo 13B RV-9Endurance
> C-FSTB
> http://www3.telus.net/haywire/RV-9/C-FSTB.htm
>
> "Whatever you vividly imagine, Ardently desire, Sincerely believe in,
> Enthusiastically act upon, Must inevitably come to pass".
>
> > -----Original Message-----
> > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
> > Behalf Of daveleonard@cox.net
> > Sent: Friday, April 23, 2004 9:38 PM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] Re: 2.85 redrive
> >
> >
> >
> > I hear your pain Rusty. I have offsets in both my engine mount
> > and vertical stab. I'm a RD-1B guy forevermore.
> >
> > Dave Leonard
> > >
> > > Well, 'bout ready to place my order for my Monster 76/88 prop from
> > > Performance Propellers. Tracy's is 74/88 but he feels that
> > with the 2.85
> > > even longer diameter props can be accommodated. If too much prop,
Clark
> > > Lydick will trim the diameter. So will ship my RD-1B to Tracy
> > to have it
> > > converted to a 2.85 RD-1C after I finish attending a couple
> > more flyins in
> > > May. Hard to get his "vertical" take off out of my mind.
> > >
> > > Ed
> > >
> > >
> > > Do you have a left offset in your mount? I sure wish I didn't, but it
> > > seemed like a good idea at the time. Now I just can't stomach the
> > > monumental re-work that would be required to go back to zero offset.
> > >
> > > Rusty (hoping Tracy's old prop will make me feel better)
> > >
> > >
> > >
> >
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
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