Sliding Van Blower

[Drei]

Hi,

Can a model IC engine sliding vane charger be with only one rotor http://www.austinsevenfriends.com/Bruce/Supercharger Information and Formulae.htm. here is a link showing the sliding van charge with one rotor. Dose this layout work for model ic because everytime i saw a model sliding vane charger, it was always with two rotors.

Thanks
Andrei

 

[1Kenny]

Hi Andrel,

The single rotor type he is showing can be used with most any engine with the right scale. For a small engine even a set of oil pump gears could be used as a blower. The single rotor design is used in aviation to run vacuum instruments on the suction side and also can be used to inflate deicing boot on airplane wings on its pressure side. Even though it is one rotor, it has 6 vanes so there is 6 short pulses for every rotation where as a 2 vane would have 2 longer pulses. The 6 vane type would deliver a less interupted air flow per rotation.

This will give you an idea of the problems one can have with a single rotor with floating carbon vanes.

http://www.sacskyranch.com/rapco.htm

Keep in mind that this is both a pressure and vacuum pump.

Kenny

 

[Drei]

Thanks for the info Kenny.. well then thats why they built the blower with two rotors even in model engine, to reduce more the pulsations. If each rotor has five or six blades and are set correctly, you will have ten or twelve pulsation each rev, which is a very good result in my opinion.
I should go for the twin rotor

Andrei

 

[1Kenny]

Yes Andrei, you are right on track with your thinking. I have ran Eaton roots style blowers on a couple of engines on motorcycles. The torque makes your heart pump faster. The ones I used had helix (twisted) blades. Here is a link to Eaton that shows their 4 blade helix type. The twist removes the pluse bump from the rotors and smooths the air flow. This will give you an idea of how you can make one.

http://www.eaton.com/Eaton/Products...egory/Automotive/RootsSuperchargers/index.htm

Kenny