Cardadeiro
I'm New Here
Has everyone done a double hammerhead on a RV7? Is it possible?
Thks
Thks
Van's Air Force
Don't miss anything! Register now for full access to the definitive RV support community.
RV-7 aerobatics
- Thread starter Cardadeiro
- Start date
tadsargent
Well Known Member
Sorta, I think it would look more like a hammerhead followed by a spin.
. I think the hammerhead into a stall is very prettyCardadeiro
I'm New Here
I will try to do one and let you know! I think it will be ok for the plane with inverted fuel and oil and everything and I can't see how it could stress the structure. What's your opinion on that issue?
Thks,
Jo
Thks,
Jo
Boyd Birchler
Well Known Member
Double hammer
I would be leery of doing a double hammer in an RV. I had a highly modded Christen Eagle with a 540 turning 2800 RPM. It would do a double hammer. The second rotation evolves some backward movement. Because of this I would hesitate doing one in a RV or you may see a departure of the rudder or elevator.
I would be leery of doing a double hammer in an RV. I had a highly modded Christen Eagle with a 540 turning 2800 RPM. It would do a double hammer. The second rotation evolves some backward movement. Because of this I would hesitate doing one in a RV or you may see a departure of the rudder or elevator.
acro in a RV7
What's a double hammerhead? Whatever it is, I think I want to avoid it....
What's a double hammerhead? Whatever it is, I think I want to avoid it....
Regular hammer is 180 degrees (1/2 turn) of yaw rotation. Double hammer is 1-1/2 turns.
Rob Holland does a nice double hammer at 1:13 here. http://www.youtube.com/watch?v=ztLxPCoGc5s
Good double hammers require a lot of rudder, power, and a little technique. I don't think an RV would do them well at all due to limited rudder. But I can't imagine in reality you could actually stand the airplane back up vertically well enough to actually get a good backwards slide going and cause any damage. That said, I would not recommend trying it in an RV. I think what would happen is that you'd do a little less than 270 degrees of rotation and the airplane would stop yawing and start rolling left and then flop around until the engine was pointed downward.
Tad Sargent actually nailed it in post #2. Most double hammers I've seen break the plane of yaw around 270 degrees of rotation, then the airplane rolls left a bit and to varying degrees looks a little like a spin through the remaining 270 degrees of rotation.
I can get it somewhat close in the Pitts, but it's still not perfectly on plane for the last 270. I shot this in the S-1S. Original small factory rudder. Kicked a little positive on the upline, a little early, and then full forward stick after 180 degrees of pivot.
http://www.youtube.com/watch?v=EKSoZv8xUCQ&list=UUm9cBvavbT4j6vReBu9H8Qg
Rob Holland does a nice double hammer at 1:13 here. http://www.youtube.com/watch?v=ztLxPCoGc5s
Good double hammers require a lot of rudder, power, and a little technique. I don't think an RV would do them well at all due to limited rudder. But I can't imagine in reality you could actually stand the airplane back up vertically well enough to actually get a good backwards slide going and cause any damage. That said, I would not recommend trying it in an RV. I think what would happen is that you'd do a little less than 270 degrees of rotation and the airplane would stop yawing and start rolling left and then flop around until the engine was pointed downward.
Tad Sargent actually nailed it in post #2. Most double hammers I've seen break the plane of yaw around 270 degrees of rotation, then the airplane rolls left a bit and to varying degrees looks a little like a spin through the remaining 270 degrees of rotation.
I can get it somewhat close in the Pitts, but it's still not perfectly on plane for the last 270. I shot this in the S-1S. Original small factory rudder. Kicked a little positive on the upline, a little early, and then full forward stick after 180 degrees of pivot.
http://www.youtube.com/watch?v=EKSoZv8xUCQ&list=UUm9cBvavbT4j6vReBu9H8Qg
Last edited:
