> >
     >>>>>> Jerry,
     >>>>>>
     >>>>>> I just talked to Ken at Vans. Stonewall. Call back
    next  Monday.  I
     >>>>>> don't
     >>>>>> have access to those drawings. The rotary has too
    many  problems.
     >>>>>> Just
     >>>>>> get the mount from us and match drill it to the firewall.  etc.,
     >>>>>> etc.,
     >>>>>> etc. The one thing that he did say was that he thought the exact
     >>>>>> location wasn't too critical. 'If you get it within 1/4" it will
     >>>>>> probably be all right.' This from an "engineer!"
     >>>>>>
     >>>>>> Rats. <other expletives deleted>
     >>>>>>
     >>>>>> I notice that Conversion Concepts offsets the engine 1
    degree.   To
     >>>>>> the
     >>>>>> right for the RWS RD-1C 2.85 redrive. But that doesn't help
    much.
     >>>>>>
     >>>>>> Where do we go from here?
     >>>>>>
     >>>>>> Doc
     >>>>>>
     >>>>>> No problem Doc we got it. If you have the cowl measure the
    length
     >>>>>> of it to the prop flange hole from the back while
     >>>>>> it is sitting on the floor pointing up. Most are 39 inches.
     >>>>>>
     >>>>>> Paul Lamar ...No rotor no motor.
     >>>>>
     >>>>> Don't have the cowl yet. Should I order it now? Conversion
    Concepts
     >>>>> says to
     >>>>> order the O-320 as it is longer than the O-360; but this
    is  kind  of
     >>>>> moot as
     >>>>> Vans doesn't approve of the O-360 in the 9. What do you
    think  of  the
     >>>>> James
     >>>>> cowl? All I have heard is that it is superior
    aerodynamically  and
     >>>>> results in
     >>>>> ~ 7 kt. speed improvement.
     >>>>>
     >>>>> Doc
     >>>>>
     >>>>> The James cowl is good. Better for the rotary.
     >>>>> We will need the length. I might have it. I'll look
     >>>>> around. Yep I have it. It is 37 inches long.
     >>>>>
     >>>>> Paul Lamar ...No rotor no motor.
     >>>
     >>>
     >>>> Doc
     >>>> My C of G on the RV7 came out one American inch behind the
    usual  O
     >>>> 360
     >>>> position with CC mount,James Cowl and Tracy box. There is
    lots  to  cut
     >>>> off
     >>>> the James Cowl, so you could position your engine further
    forward.
     >>>>
     >>>> Ian.
     >>>
     >>> Thanks Ian for the good news. Lighter is better.
     >>>
     >>> Jerry Hey will be building the mount. You get this, Jerry?
     >>>
     >>> Doc
     >>
     >> Yes,I am looking forward to seeing how Paul handles the nose gear
     >> socket.  I am sure he will come up with a good design. This will be
     >> the first time for me to build an SBeam mount with the nose gear a
     >> part of the mount. The nose gear structure should be a good
    place for
     >> the rear strut.   Jerry
     >>
     >>
     >> It will look exactly like this mount except the following
     >> tubes will be kept.
     >>
     >> The best way to do it and probably cheaper in the long run
     >> and much more likely to fit perfectly is start with a Lyc
     >> mount and cut way what you are not going to use.
     >>
     >> --
     >> Paul Lamar ...No rotor no motor.
     >
     > I agree that would be easiest.    Jerry
     >

    I note that James specifies a cowl for the 6, 7, & 9. No As, all
    tail wheel.
    I sent them email asking if that is what they meant or if it was a
    simple
    oversight - but have not yet heard back.  And for $950 just for
    fiberglass
    very pricey imo. Pricey enough to make me start thinking about
    fabing one
    from scratch. And I note that James didn't design it. So what does
    that mean
    for the aerodynamics?

    That great gaping cooling scoop makes me wonder. Reminds me of the
    changes
    Mooney made to make the 231 go fast. They closed up the cooling
    inlets to
    less than half what was on the M30 (super21) that I owned. That and
    other
    aerodynamic tweaks netted 50 MPH. Same engine.

    Doc


    I am starting to agree with you on the James cowl.
    I can supply section dwgs that you can cut out for templates
    if you want to do your own. I'll submit a 3D and you can make
    changes until you see something you like.


    BTW You might need that size hole to cool at takeoff and climb speeds
    Doc. Not to worry however it will have very little drag effect
    at cruise IF you install cowl flaps on your RV9A.

    Paul Lamar ...No rotor no motor.


Hey Paul,

I generally agree with you on cowl flaps, I think..   However, I noticed
recently that several somewhat high horsepower singles are either coming
out without cowl flaps, or eliminating them.  For instance, the Lancair
Columbia, the Cirrus SRs and the Mooney Acclaim don't have them.
Previous big engine turbocharged Mooneys did have them.

Are the designers assuming that people are dumb and forget to open and
close them?  Or maybe cowl flaps end up in service difficulty
situations?  Or maybe they are designing these planes for mostly high
altitude ops where indicated airspeeds are fairly low while at high
power settings?   Seems like on a high power turbocharged air cooled
$50K engine, you'd like to be able to keep it warm on long descents...


Regards,

Matt-

Forgetting the cowl flaps is easy. They could be automatic using
a VW thermostat.

There is also the cost involved. They may just delete them to save
on first cost.