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whirlwind 74RV in taildragger?
was talking to the guys at whirlwind, and they have new prob called 74RV, which is 74inches, would this be a problem on a taildragger?
my interp of the info on vans site is that the 72 inch is rec for this application. thought from the group? das |
What model plane? On my RV8 I have 72" and can't imagine one more inch making much difference as there is plenty of ground clearance.
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I fly a 74 inch hartzell on my TW rv7, no problems with ground clearance.
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thanks, I'm a RV7 tailwheel
das |
74 inch Hartzell RV 7 works for me over 1000 hrs
Larry |
No problem at all with the 74RV in an RV-8 taildragger. I originally had the 200RV 72" blades and swapped to the 74RV, no complaints.
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For people flying the 74RV, curious what engine and HP you're running with?
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Not to worry...
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Whirlwind 72" vs the 74"rv
Quote:
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Quote:
The 74RV looks faster on the ground and gets a lot more attention than the 200RV did. |
Hartzell v. 74RV
I changed from a 72" Hartzell BA to a 74RV at 75 hours on a IO-375 mounted on a -7. I was concerned about vibration effects on an aluminum club from a ~210hp engine with EI, 9.6:1 compression. What performance comparisons I made did not show detectable, repeatable results between the two. My butt tells me the 74RV is a bit smoother. Prop looks a lot faster than what you'll experience. Don't sweat the inch radius on a TD unless you try to "pin" a botched wheelie. I know a guy who trimmed a BA from 72 to 70 doing this.
John Siebold |
thx all,
John, is there any sig problem with the 210 hp in the RV7? I was looking at superior's engine, similar hp....obviously vans "can't endorse that HP, but you're the builder, so you can decide" was their answer.. das |
More horsepower = better. Too much horsepower = best. You can always pull back the black knob.
Now let's see where this thread drifts. John Siebold |
200 HP +
I had a 200RV on the 7 that I sold and it was great. Smooth and reliable. The new 7 will have a new IO390 with Barrett Precision work done. It is close to 220 HP.
I consulted with Whirlwind and they said the 74 is most efficient with 200+ HP engines. Below that the 200RV is more effective. The 74 has more diameter and a thinner blade. So, 200 or less go with the 200RV, 200+ consider the 74. |
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