Sitting Height
 

I feel that I'm sitting a bit low. Have lots of headroom and can see none of the cowl (am 5'10"). Want to shim the seat cushion from underneath.

For those have done this successfully, did you just add material to the flat part of the floor, or did you also add material to the sloped under thigh area?

Walt Aronow, Are your Oregon Aero bottom seat cushions 2" thicker from front to rear, or does the added thickness taper toward the front? Same question about your wife's 4" thicker cushion.

Thanks all.

Cheers, David
RV-6A

Flightline Interiors...
 

...simply makes trapezoidal wedges that sit on the floor and are shaped to follow the slope of the seat back and floor slope up towards the stick. You simply tell them how much extra height you want and they send a new booster cushion. I can't imagine that Oregon Aero couldn't do something like that. I got a variety of heights to allow for different heights in the copilot seat for friends who like to fly with me.

For my own cushions (I'm 5'5", 28" inseam), I have both the small booster cushion on the floor and a full sized booster in the middle that is the same lateral dimensions as the actual seat cushion but a bit thinner and made out of harder foam and finished more simply. The final, top seat cushion is therefore the 3rd cushion.

I agree with you wanting to be as high as possible and seeing the cowl.

Buy some Confor foam in the 1" Green (firm) sheet.

I cut this to shape and placed it under the Oregon Aero seat cushion. I only used a 1" piece in my RV9A. I have about 2" clear below the canopy and have not hit the canopy in either a helmet or David Clark headset (so far).

The foam piece sits in the pan under the OA cushion between the seatback and the front incline. The foam is easy to cut if you cool it in the refrigerator first. While cold it is fairly easy to cut straight lines and angles.
By the way, the Confor foam does not deform very much under the OA cushion, however, sit on it alone and you will settle about 50%.

Fairly inexpensive way to determine where you want your head to be and what sight picture you like.

Then spend money for a more elegant solution.

OA has booster pads. They are the black solid style and work nice for adding height for younger and/or shorter people.
I recommend when the seats are cold sit so that your hand will pass between the canopy and headset, when your butt warms up the seat the clearance will be perfect, about 2 hands clearance. This will happen during taxi, doesn?t take long.
:-)) Larry

almost a -14 mod
 

since nobody mentioned it yet, I think the big secret of this mod is that you can put a lot more foam under your butt, for comfort, without your head hitting the canopy....and adjust the seatback for best comfort, sightlines, etc.

find one in your area and try it, I'll bet you can find the perfect fit!

( note: I don't have this mod.....yet!)