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Whirlwind 300-RV Full Power ground run

moespeeds

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Got about 60 hours on mine now on my RV4 and absolutely love it. Converted from a 2 blade metal fixed pitch. You are going to be even more happy with the flight performance!!!
 
Speed

Did you top speed suffer at all, and do you like it better for acro? Running a fixed pitch wood sensenich but will want to make a change in the next year or so
 
I was running a 2 blade metal FP and actually picked up about 2 mph on the top end with it. Obviously the acceleration is better. I definitely like it better for acro because the braking action of a constant speed helps with the speed control on the down lines. other then the serious lightening of my wallet I haven't found a single negative aspect from the change.
 
When you swap, do a really good job of figuring out your new best glide. I see a lot of posters say thier best glide is around 90-95 knots. With this prop in fine pitch, a 95 knot glide puts us in about a 35 degree dive. It's an aggressive amount of aero braking.
 
Best glide

35 degrees? That's not a glide. That's a brick falling. :D

I'm curious to see the numbers when he's done testing.
 
Just a follow up here:

Glide was hairy until I really got aggressive with the low pitch stop. This helped tremendously.

Lost nothing in cruise, seems like I might have gained a knot or so in low RPM cruise (~2300)

Big difference in climb. Initially solo I'm holding over 2500 fpm @sea level though I'm CHT limited as the cylinders get hot fast at this angle.

The thing launches off the ground when you put the power in.

Overall I'm super happy with it, and the plane sounds amazing. Totally changes how it sounds.

https://youtu.be/u8hQGY3wGSg?si=QzB7azemyJq-2uYV

https://youtu.be/E2WG3_Vs9PQ
 
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