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Message
I almost always accelerate to 120 mph for my climb
as that has previously given the best rate of climb for my somewhat heavy
RV-6A. This new prop and gear box have increased roc by approx 500 fpm
based on the one flight to approx 1500 fpm.
However, with the larger prop I think I
need to do some more testing as a slower speed but faster roc just might be in
the cards.
I'd bet they are. My RV-3 has always defied
the "standard RV" 120 mph best ROC rule. Best ROC has always
been in the 90 to 100 mph range, though it's also done well at higher
speeds. I believe Tracy mentioned that he's seen a trend toward best
ROC being at lower speeds since he went to the 2.85 drive. My only SWAG is
that we have more torque, so we're able to produce more power
without having to unload the prop as much as you would at higher
speeds.
Well, its clear that a total of 28 sq inches
core inlet is more than adequate for a 13B at cruise around 5200-5400 rpm
and 8 gph. My oil and coolant stayed at 165-170 with OAT at 70F. However,
when I bumped the rpm up to 6300-6400 the oil rose to 200F and the coolant to
205F before stabilizing given me a true airspeed of right at 200 MPH burning
11.8 gph. So It appears I need to open my left core inlet back
up a bit from its current 10 sq inches to approx 18 sq
inches.
I don't
follow your logic here. You're saying that full throttle cruise is
200 F oil and 205 F coolant? What the heck is wrong with
that ?
Hope to see you there. Any chance of
you attending Charlie England's flyin in Mississippi weekend of the 16 Oct?
Nope, no chance for the 16th. Basically, I've got
3 weekend to fly off my remaining 7.3 hours, and do some additional
testing. If anything else goes wrong, even Tracy's fly-in is off
for me. To be honest, I'm still kinda bummed that it's being move to
a different location. I would have voted for postponing, rather than
moving.
Cheers,
Rusty (selling Airbike in 22
minutes)
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