FWIW, my revmaster has a small pulley on the prop hub which runs an airborne
vacuum pump that is attached to an aluminum bracket that hangs from the front
of the engine. Very light setup, but have no experience flying this setup.
At 11:43 PM 6/5/98 -0500, you wrote:
>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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