I would put a real vac pump on but i am low on places to hang stuff. I was
wanting to run a venturi from cowl air and exit through a cowl cheek. Hell,
it may be easier yo hang a venturi on the side and try to smooth it in. A
venturi is reliable if it doesnt freeze up. My last option would be an elec
horizon.
-----Original Message-----
From: Patrick Panzera <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Friday, June 05, 1998 10:44 AM
Subject: Re: DFLY: IFR Dragonfly?
>Mick Myal wrote:
>
>> AT SNF the Century Instrument people advised to use a smog pump for
>> vacuum. Apparently several people are using these auto units.
>
>Hmmmm... that started my wheels turning, until I remembered the
>last time I held one in my hands. They weigh considerably.
>They are made of cast iron in order to withstand the temperatures
>of pumping hot exhaust gas back into the engine. Not to mention
>that they are (relatively) huge. About the size of a normal (as
>opposed to a compact) alternator.
>
>You are still going to have to jump through all the engineering
>hoops of installing this unit that you would have to jump through
>to install an aircraft vacuum pump. The only advantage would
>be the cost of the unit. You are still going to need all the
>same peripherals such as a regulator, hoses, filter etc.
>
>The Evans bros installed an aircraft vacuum pump in their DF and
>wrote up it's installation in one of the newsletters.
>
>Pat
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