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keithmckinley
Joined: 11 Aug 2008
Posts: 434
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 Posted: Mon Feb 17, 2014 6:42 pm Post subject: Re: Aerobatic with CJ6A |
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Pappy,
I would imagine that a aft loaded CJ with an M-14 might be coaxed into a flat spin. Must be interesting!
My reference was for a stock CJ since it looked like that's what the original poster has.
Keith
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cjpilot710(at)aol.com
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| Posted: Tue Feb 18, 2014 6:35 pm Post subject: Aerobatic with CJ6A |
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Never tried inverted spin personally. Some years ago just before OSH, we had get together at MTW. We asked one of the Russian acro champs to come and be available to give acro instruction to the Yak 52 guys. He went up with Keith Harbor (If I'm remembering right) and they did some inverted spin in Keith's CJ. Since it has no inverted oil system of course so the HS6A engine in Keith airplane, dumped its oil though the breather. I didn't get to discuss how well the CJ did them, but I don't think it would be "stellar".
I'm not sure if having a M-14p in a CJ will make a flat spin easier to enter. The M-14 is heaver than the Chinese HS6A by about 70lbs ( That number sticks in my mind) so until you adjust the ballast, it would make the airplane more nose heavy. Plus that weight's inertia has to be over come to get the airplane rotating. But I've never tried flat spins in a HS6a powered CJ.
The first time was very interesting! I had done my little routine for a little fly-in at our airpark. In my routine I push the power to 2400 rpm and 32" to 34" mp and leave it there though out. After landing and bowing to the adulation's of the crowd, one gentleman wanted to go up and ride though the routine with me. I needed fuel anyway, so he hop in and I flew to the local airport and refueled. ON the way back to the airpark, he asked about spins, and I told him I'd demo one at the end of the routine. I climb to 4,000' set up my power and flew the routine. The end of the was a loop. I was talking to him as I did each maneuver. So - - "I'll now show you a 2 turn spin." I continued to pull the nose up to 40 deg or so and at the stall brake, I push hard right rudder, and pulled the stick straight into my stomach. I NEVER REDUCED THE THROTTLE. The airplane broke into what I thought was very normal "stable" spin, with no pitch changing through the rotations. At the end of the second turn, I released the pressure on the stick, expecting it to move forward and recover. The stick DID NOT MOVE. It was a half a turn before I realized something was not right. At point I pushed forward on the stick, and was surprised at the amount of force required - 3 pounds. I terminated the flight thinking maybe something was mechanically wrong. After discussing it with some real pros, I discovered I had inadvertently enter a flat spin by leaving the power on at stall brake. It does get your attention.
But note my airplane was at its most rearward CG. I had full tanks (55 gals), chutes, and a more than standard weight passenger in back.
Jim "Pappy" Goolsby
In a message dated 2/17/2014 9:43:38 P.M. Eastern Standard Time, cetopfed(at)gmail.com writes:
| Quote: | --> Yak-List message posted by: "keithmckinley" <cetopfed(at)gmail.com>
Pappy,
I would imagine that a aft loaded CJ with an M-14 might be coaxed into a flat spin. Must be interesting!
My reference was for a stock CJ since it looked like that's what the original poster has.
Have you ever tried to spin it inverted?
Keith
--------
Keith McKinley
700HS
X26 Sebastian, FL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=418919#418919
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