Currently looking to purchase a new prop for my aerobatic aircraft. I'm planning on purchasing a 3 bladed Catto but was curious if anyone has used a ground adjustable prop on their aerobatic aircraft?
Currently looking to purchase a new prop for my aerobatic aircraft. I'm planning on purchasing a 3 bladed Catto but was curious if anyone has used a ground adjustable prop on their aerobatic aircraft?
My observation has been that modern ground adjustable props are generally used on airplanes that fly with 80-125hp.
In 11 years of aerobatic competition, I have never seen an aircraft with a ground adjustable propeller. The fixed pitch props get run up to as much as 3200rpm, so an adjustable hub needs to be pretty rugged. And the fixed pitch prop manufacturers seem to be pretty good about repitching if you need it. So there really is no need to field adjust the propeller pitch.
Best of luck,
Wes
Thanks for the reply Wes those were my thoughts as well
What about the new breed of GA props from Whirlwind and Sensenich that are designed for RVs with 360s on them? Obviously these are aimed a little more towards speed than anything else, but surely they would be able to handle at least sportsman to intermediate acro since they're designed for RVs.
I've been thinking of putting one of these on my Pitts when it's finished to get good acro performance but also good cruise performance when I want it (eg. going to and from contests). Does anyone have any experience with these? Any opinions?
http://www.whirlwindpropellers.com/g..._lycoming.html
http://121five.com/stories_new.aspx?story_id=1133
Almost all "ground adjustable" props only get adjusted a few times and then never touched again. It appears to me that most owners put them on, look for a good setting, and then leave them at that setting. Now if you are talking about adjusting them to go to a contest, at the contest, and again when home, I think that you are giving yourself one more item to worry about, have to triple check, and potentially get wrong, resulting in low contest scores. You have to carry more tools to work on the prop and most acro ships have limited space in the first place.
And the next question is whether the hub is up to the stress of acro. We have suffered through the expensive Hartzell prop hub AD's over the years, which suggests that the rapid maneuvering of acro is going to find the weak spot in any new hub design. Can you afford to be a test subject? While the prop in question may be great, the lack of acro fleet experience suggests that you should be prepared financially in case this experiment does not work out. Of course, if you go through the season and collect trophies everywhere you go, you look like a genius. But in the end, your choice of propeller will have little to do with that result.
Best of luck,
Wes
N78PS