Dave;
Take a look at the SR-71 inlet. Alternatively, take a look at the variable
nozzle on the tail- end of an F-16. It looks possible to do something like
either of those approaches without adding drag as the inlet area is varied.
Who knows-- maybe it won't work, but then again if someone doesn't try it,
we won't know for sure.
Regards, Neil Tucson, AZ
-----Original Message-----
From: Dave Dahlgren [mailto:ddahlgren@snet.net]
Sent: Tuesday, January 29, 2002 5:27 AM
To: Albaugh, Neil
Cc: 'Higginbotham Land Speed Racing'; 'DrMayf';
land-speed@autox.team.net
Subject: Re: Scoop Openings Revisited.....
I personally fail to see how this is going to make the car faster. maybe I
am
missing something? How do you propose to change the size of the opening
dynamically, not the actuator method but the inlet size itself mechanically?
How
do you do this with out the same loss in aero? it must be a very convoluted
structure i would think to have a decreasing opening with an associated
change in
overall area. If you use anything like a flat plate or butterfly won't you
still
have all the aero drag associated with the overall size of the structure? If
this
is only to keep the inlet pressure constant wouldn't it just be easier to
place
it in a spot that does not have any ram air in the first place?
Dave Dahlgren
"Albaugh, Neil" wrote:
> Skip;
>
> As the old saying goes "To a man who only has a hammer, everything looks
> like a nail." Since I'm in the electronics game (it is a game-- fun,
too!),
> I'll suggest using an electronic approach which could use a small servo
> motor to vary the diffuser position and/or inlet area. An RPM sensor
> (wheel/engine?) and an airspeed sensor could be two data parameters that
> control the inlet; perhaps manifold pressure (MAP) might be another. I'm
> sure others may have suggestions on how it could be accomplished. Moving
it
> manually might not be out of the question but the less a driver has to
> distract him, the better.
>
> Regards, Neil Tucson, AZ
>
> -----Original Message-----
> From: Higginbotham Land Speed Racing [mailto:saltrat@pro-blend.com]
> Sent: Saturday, January 26, 2002 8:09 AM
> To: Albaugh, Neil; 'DrMayf'; land-speed@autox.team.net
> Subject: RE: Scoop Openings Revisited.....
>
> Neil,
> As usual you have hit the nail squarely on the head. Now......how to vary
> the inlet size AND the size of the diffuser. (Air Box as Joe has
> suggested). If all that can be done in direct relationship to the speed of
> the car/air density, then we have the perfect inlet!!! AND the best ram
> recovery.
> Skip
>
> At 11:16 AM 1/25/02 -0600, Albaugh, Neil wrote:
> >Maybe a variable- area inlet is what is needed. ...works on an SR-71;
that
> >goes pretty fast.
> >
> >Regards, Neil Tucson, AZ
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