REFLECTOR: Exhaust upgrade

[Geoff Gerhardt]

Ruben,

My exhaust will show up tomorrow.  On Monday, I did some speed runs to
gather some "before" data.  Hope to put the new exhaust on on Saturday and
take it for a spin.  I'll let you know how it goes.  I have a long flight
planned the end of next week.  Worcester, MA to Minneapolis, stay in
Minneapolis for several days, then up to Saskatoon SK (Canada).  Hoping the
new exhaust works well and gives me a few extra knots for the trip.

Geoff

On Wed, May 29, 2013 at 5:07 PM, Ruben Creus <ruben.creus at binnaclecg.com>wrote:

> ** ** **
>
> Geoff,****
>
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>
> Any updates on your tests?****
>
> ** **
>
> Ruben****
>
> ** **
>  ------------------------------
>
> *From:* Geoff Gerhardt [mailto:geoff.gerhardt at gmail.com]
> *Sent:* Friday, May 24, 2013 7:13 PM
> *To:* ****Velocity** Aircraft Owners and Builders list**
> *Subject:* REFLECTOR: Exhaust upgrade****
>
> ** **
>
> Guys,****
>
> ** **
>
> I've ordered a new set of pipes from ****Clinton**** at Custom Aircraft
> Parts.  I will be replacing my stock **Velocity** exhaust that are 2-1
> and vent out the bottom of the cowling.  The exhaust from Custom Aircraft
> is a set of 4-4 pipes that will vent out the rear of the cowling into the
> prop.****
>
> ** **
>
> I will collect some good data this weekend (weather permitting) of my
> current performance.  Hopefully by next weekend, I'll have the new exhaust
> mounted and can collect data with it installed.****
>
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>
> Here's what I'm expecting:****
>
>    - ****Clinton**** has indicated that going from the 2-1 stock **
>    Velocity** exhaust to the 4-4 will result in a significant HP boost
>    (12-18HP).  He thinks that the 2-1 format for an IO-360 is the worst
>    configuration, as the exhaust pulse from one is interfering with the intake
>    for the other cylinder.  He expects that I will see a measurable and
>    significant increase in static RPM with this switch.****
>    - I expect my CHT's will drop.  I have pretty big holes for my
>    existing exhaust to exit the cowl.  I think this is adding a lot of
>    pressure to the lower cowling.  Also, venting the exhaust out the rear of
>    the cowling will actually create a vacuum inside the cowling.****
>    - Cruise TAS?  Who knows.  We'll see if there is, indeed, some drag
>    from the exhaust disrupting the airflow.  The added HP will help, I suppose.
>    ****
>
>  ** **
>
> If anyone has some suggestions for a test flight that will provide good
> comparative data, please let me know.****
>
> ** **
>
> This exhaust system will cost me $1200.  He indicated that he would lower
> the price if more orders were rec'd.  He wouldn't give me a lower price by
> acting as the guinea pig and providing good before/after test data, but
> said if anyone mentioned my name, he would give me a percentage of the
> sale.  So, if after you see the data from my testing and you want to order
> a similar set of pipes from ****Clinton****, mention my name.****
>
>
> Geoff****
>
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>
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