REFLECTOR: Need for speed

Wed May 22 14:41:49 CDT 2013

There are two consideration beyond what I have seen mentioned.

First HP = Heat and that is not induction air heat but rather the decrease
in air density mean less cooling available the higher you go and you will
be producing heat that is not proportional to the altitude.

Second issue is failure mode.  What happens when a belt break of
supercharger locks up.  In some configurations, there is little or no
indcution air flow.

Jerry Brainard
Jerry at JLBEnt.com

   	-------Original Message-------
From: Geoff Gerhardt <geoff.gerhardt at gmail.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: Need for speed
Sent: May 21 '13 9:28am

You guys would be surprised how simple the [LINK:
http://www.forcedaeromotive.com/homebuilt.htm] Forced Aeromotive
supercharger is.  The turbine is run off a belt (a modified starter ring
drive is supplied that can drive both a alternator and the supercharger).
Intake air is scat ducted into the SC, compressed air is ducted to the fuel
servo.  Boost is managed by throttle position - a redline MAP of 30" is
used, the throttle is used to manage this.  As far as heating goes, while
there is some heat generated by the compression of the air, this is
relatively minimal compared to the heat generated by a turbo that
experience the exhaust gas heat.

On Tue, May 21, 2013 at 8:50 AM, Mark Magee <[LINK:
mailto:edjonesbrady at gmail.com] edjonesbrady at gmail.com> wrote:

Geoff,
I second Richard's comments and add that TN, TC and SC significantly
increases the complexity of an aircraft. The main point being Richard's,
are your hops long distance enough to gain the efficiency at altitude, and
are you willing to be on O2 while at altitude. Finally google aircraft
turbocharger charge air cooling. Volumes have been written on this special
topic. Superchargers as well heat the charge air, not quite as much yet
still an issue.

Mark B. Magee
N34XL

Sent from IPhone 4S

Watch, stand fast in the faith, be brave, be strong. Let all that you do be
done with love. 1COR 16:13-14

On May 21, 2013, at 6:46 AM, Geoff Gerhardt <[LINK:
mailto:geoff.gerhardt at gmail.com] geoff.gerhardt at gmail.com> wrote:

Guys,

Ok, in my pursuit for more speed, I have narrowed down on two mods.
Definitely will be changing my exhaust - I'm working with Clinton at Custom
Aircraft on this.  He is quoting some pretty big numbers (+18HP) for
switching from the standard Velo exhaust (2x2-1) where each cylinder is
battling the other to a 4-4, we'll see.  I am looking forward to better
cooling as I won't be adding pressure to the lower cowl with the exhaust
hole cutouts (pretty big on mine), and exhausting out the cowl will create
a lower cowl pressure to draw cooling air out.

Now, for the big speed increase, turbo or supercharging (normalization).
I'm exploring a couple options there.  There's a guy close by who has a
complete RaJay turbo normalization system for an IO-360 off a Mooney.  Its
been rebuilt.  He says its a very simple system, manual wastegate. I still
haven't got a price from him, tho, and I expect it will be $20K+, tho.  The
other option is supercharging.  I talked to the guy from [LINK:
http://www.forcedaeromotive.com/homebuilt.htm] Forced Aeromotive yesterday.
 Their system sounds pretty bulletproof and simple and provides 8000' of
TN.  That is, at 8000', you still have 30", flying at 10,000' would be like
flying at 2000' without it - you get the idea.  It has no wastegate, the
manifold pressure has a redline of 30" that you're not supposed to exceed,
so at a low elevation field, you would not take off with full throttle,
just advance it to 30".  As you climb, just keep nudging it up to maintain
30".  It is a nice, simple install and costs ~$10K.  Apparently, you can
climb like a bastard with it, and can expect >15kts increase at cruise.
I'm leaning more towards it than the turbo.  The one big advantage to the
supercharger is that it has a pretty cool air charge (unlike the turbo
that, even with an intercooler, the air produced is hot).

Any thoughts?  Anyone had experience with turbo/supercharging an IO-360?

Geoff

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