Vision prototype photo

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

Wednesday, November 8, 2017

Air Intake Scoop

Nov. 8 2017
Today I completed the fabrication of the air scoop onto the lower cowling.  I purchased an air scoop from a third party vendor and am modifying it to fit my cowling.  Reshaping the air scoop was required and quite a bit of the flange and mating edges cut off.  I needed to measure distance clearances of the air filter box to make sure it fit within the scoop.  Once the scoop was modified it was bonded on to the lower fairing with flox.  A layer of bid cloth on the bonded edge will also be required.

I have anchored the lower cowling to the firewall flange using 8/32 machine screws with anchor nuts riveted onto the back side of the flange.  I am using 18 screws to hold the lower cowling in place.

The upper cowling has been trimmed to fit in place but is just resting in place at this time.  I will be installing Camlock 1/4 turn fasteners to hold the upper cowling in place.  I prefer the quarter turn fasteners on the upper cowling for ease of removal which allows quick removal for visual inspection of the engine compartment.  The split line of the upper and lower cowling will use piano hinge, this also provides for quick removal.

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.

Wednesday, September 13, 2017

Wing Root and Belly panels

The belly panels have been fabricated and glassed with two layers of bid.  Similar to the top root fairing panels two layers of poster board were attached, then covered in packing tape and duct tape as release agent prior to the fiberglass.  The fiberglass is yet to be removed so the poster board can be removed underneath.  Panels will be trimmed and attached.
The Leading edge cuff of the wing root fairings has also been completed with 2 bid.  These wing root fairings will all require some fill to get them nice and smooth.

Thursday, September 7, 2017

Throttle Quadrant

My throttle quadrant set up has been modified to my particular needs.  The Throttle lever also has a lower reversing arm that can drive a throttle on the passenger side of the cockpit.  Mixture and prop will only be on the pilot side.  The passenger throttle will not be installed but will be available if required for X-training purposes.

Friday, August 18, 2017

First engine fitting.

Engine mounted for the first time.  Will test all attachment cables and firewall pass through items for connection to engine.

Monday, August 7, 2017

Wing Root fairings - upper

Began to build wing root fairings for the upper portion of wing.  I was looking for a way to do this that would not take to much time and effort as it would if foam were to be carved for shaping this section.  I used small 4 inch sections of double poster board to form the shape.  This worked well but I will have some filling to do on the upper surface due to stepping of each posterboard section onto the next.
Upper surfaces glassed with two layers of cloth.