Vision prototype photo

Vision prototype photo
This is the Vision prototype designed/built by Steve Rahm in USA.

Tuesday, October 31, 2017

Air Filter and Intake

October 31, 2017
I have completed building the air box system that will include the air filter. The air box is attached to my Rotec Throttle Body unit which is also a compact unit and helps to reduce the vertical space of the front lower cowling.  The original carburetor that came with the engine was about seven inches deep vertically and would have made for a poorly streamlined front engine cowling.  The air box has a  clever flapper door at the front for allowing heated air from a heat muff into the intake when required.  The door on the hot air intake closes off the ram fresh air, maximizing the hot air volume.

October 15, 2017
 Building up the air box system.  The kit is from Vans aircraft which is used on most of their various aircraft.  I like the system because it is compact and yet allows ram air and a real good K&N oiled filter.  this is a one time purchase round filter which can be used over and over by cleaning and re-oiling.  They are widely used on numerous performance cars.  It took a bit of time for me to build up the kit but am very happy with the final product.

Friday, October 13, 2017

Propeller and Cowling fitting

October 13/17
It has been very time consuming to get the fit of the cowling trimmed for final position.  Thanks to Scott I was able to purchase a pre-made cowling for my project which saved me a great deal of work.  The cowling fits very well and will require me to build up my flanges in a few areas to get the cowl to meet the fuselage perfect.  There are also two areas I will have to build up the cowling aft upper edges to meet my fuselage correctly.  Trim fit trim fit trim fit, 30 some times before I got it to where it fit best.

September 29/17
The constant speed propeller has been mounted to the engine with great assistance from my hangar neighbor.  Alan had a Whirlwind propeller on his past RV6 and was very helpful in getting my spinner and prop temporarily mounted.  Not having worked on the install of a CS prop I was grateful for the teaching course.  I am now slowly working on trimming the lower cowling to fit the airframe.