I have been working on my RV4 kit for several years down here in Australia and was hoping that one or more of the flying owners may be able to help out with a particular measurement. I will be fitting a Velo rally car seat (similar to John Johansen's round the world RV4) and wish to position its height for optimal three point visibility. However, as it will be some time before I am able to hang the engine and fit the cowls, seat height for three point visibility becomes quite difficult to estimate. What would be enormously helpful would be to know how far the highest point of the cowl sits above the fire wall relative to the horizontal. This could be easily measured by siting a spirit level (we call them bubble sticks) on the highest point of the cowl when the aircraft is sitting on level ground, and extending this line back to a point directly above the fire wall. I could then use this datum point to estimate three point visibility over the cowl. Of course if I had access to a long legged RV4 anywhere near by I would simply take this measurement myself. I am guessing it may only be an inch or two but without an actual aircraft to measure I simply don't know. And yes, we can of course add this building complication to the long list of problems we encounter whenever we make changes to the plans, (ie fitting a custom seat, moved aft for a tall pilot = changes to roll bar position= changes to canopy frame and on and on it goes...).Thanks in advance to those of you who might take the time to help me out. I only wish I had thought of this when I visited Oshkosh last year and saw so many wonderful examples of the RV4.
Thanks again,
Darren
Thanks again,
Darren
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