Daryl's memo, firewall, CG

[bransom]

I was real interested to read that memo. (missed it January) It offers an
explanation to an impression I have formed (correct or not), of fairly
large variations in reported stall speeds for the Rebel. I know that some
of the explanation is just due to variations in pitot tube (diameter, AOA),
but the airplane is doing some things here too. Best example might be Bob
P's past notes on his 912 Rebel confidently doing controlled turns under
30mph, compared to what I think is closer to at least 15mph higher for
Rebels flying in the 1500-1600+ lbs range. I'm really hoping for slow-end
capability in mine due to interest in wheel operations on slim pickins
"runways".

Anyway, it got me all re-interested in what's going on with the
aerodynamics, CG, etc, even revisiting whether to move my firewall back.
Looked through the archives a bit and I conclude (again) that I will leave
it forward. I'm guessing that the original recommendation to move the
firewall was based in part on use of a metal prop, quite a bit heavier than
other options. (I dunno tho, more people were flying Warps then too.)
Plan to still strive for light stuff on the engine, probably put the
battery in back, VGs on the wing, Fife tips. I really do wonder tho if the
firewall move recommendation already included the above light FWF stuff.

IMO, there is a hole in engine availability in the 100-160hp range. Not a
fan of Franklins, 0235s too heavy IMO, so what is there at a HP and weight
proportionally between a 912S and 0320? (Rotech? Gesoco?)

Again though, great considerations in that article, well written, and it
surely points out how tweaking one thing bumps everything else.



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