Rotax 503 convert to free air

[JimG]

Thoughts please, I have a 503 that i will be using in a tractor set up and it has always bothered me that the fan forced air cooling exhausts out the front of the tin covers in this application.

 

I've read in a few places about people removing the fan and setting up a kind of air scoop and tin ducting around the heads and cylinders.

 

As I have found nothing in specific detail of how this is made or perhaps bought, I'm hoping someone here may be able to point me in the right direction.

 

Thanks

 

JimG

 

 

[fly_tornado]

should save you 1-2 hp in parasitic drag. doesn't the fan comes from the days of it as a snow mobile motor? i think you can get away with just removing the fan belt

 

 

[skyfox1]

Thoughts please, I have a 503 that i will be using in a tractor set up and it has always bothered me that the fan forced air cooling exhausts out the front of the tin covers in this application.I've read in a few places about people removing the fan and setting up a kind of air scoop and tin ducting around the heads and cylinders.

As I have found nothing in specific detail of how this is made or perhaps bought, I'm hoping someone here may be able to point me in the right direction.

 

Thanks

 

JimG

Hi JimG go Zenith CH-701 Thread post #32 there is a photo of my old Tyro with a free air 503 l will see if Phil will take some pics of the air duct l made for it year ago worked good.

cheers Geoff.