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The "8 Knot Mod"
- Thread starter jrichards
- Start date
South Burlington, VT
- Aircraft Year
- 1978 580
- Aircraft Type
- Super Commander
- Reg Number
- N555LP
- Serial Number
- 14405
Re: The "8 Knot Mod"
Hi All,
For those of you following this thread, please check the following new thread:
SuperStream
I am trying to contact everyone who had posted here to make sure you are aware the STC has engineering approval and is now imminent and I am offering some very special early-bird prices for the kit and/or turn-key modification. Specials end this Friday, Oct 1.
Jim
Hi All,
For those of you following this thread, please check the following new thread:
SuperStream
I am trying to contact everyone who had posted here to make sure you are aware the STC has engineering approval and is now imminent and I am offering some very special early-bird prices for the kit and/or turn-key modification. Specials end this Friday, Oct 1.
Jim
cmd114Justice
New member
Santa Monica, CA
- Aircraft Year
- 1977
- Aircraft Type
- 114
- Reg Number
- N4867W
Re: The "8 Knot Mod"
What is the 8 know mod? And, what is the best three blade propeller to install on my commander 114. Thanks. George Justice. www.cmd114@yahoo.com
What is the 8 know mod? And, what is the best three blade propeller to install on my commander 114. Thanks. George Justice. www.cmd114@yahoo.com
Glendale, AZ
- Aircraft Type
- 112TCA
- Reg Number
- N91GM
- Serial Number
- 13184
Re: The "8 Knot Mod"
Info you requested is in page one of the thread you posted in (here). There is also lots of info on Props if you use the search function (been discussed many times).
Info you requested is in page one of the thread you posted in (here). There is also lots of info on Props if you use the search function (been discussed many times).
South Burlington, VT
- Aircraft Year
- 1978 580
- Aircraft Type
- Super Commander
- Reg Number
- N555LP
- Serial Number
- 14405
Re: The "8 Knot Mod"
Hi George,
The "8-Knot Mod" is a certified change of incidence of the horizontal tail. Eleven Commanders are now flying with this mod, with TAS gains in the 6 to 10 knot range.
http://www.aerodyme.com/Speed-Clinic/speed-clinic.html
Jim
Hi George,
The "8-Knot Mod" is a certified change of incidence of the horizontal tail. Eleven Commanders are now flying with this mod, with TAS gains in the 6 to 10 knot range.
http://www.aerodyme.com/Speed-Clinic/speed-clinic.html
Jim
skiing
New member
Parkersburg, WV
- Aircraft Year
- 1992
- Aircraft Type
- 114B/115
- Reg Number
- N60046
- Serial Number
- 14546
Re: The "8 Knot Mod"
Jim,
Aerodymes tail mod and your rigging has brought new joy to flying my 114B. Flew animal rescue yesterday from PKB-BNL-PKB. I am still getting TAS of 156 to 158 with 1900 hour IO540. Hope you and Martine are doing well in beautiful Vermont.
Jim,
Aerodymes tail mod and your rigging has brought new joy to flying my 114B. Flew animal rescue yesterday from PKB-BNL-PKB. I am still getting TAS of 156 to 158 with 1900 hour IO540. Hope you and Martine are doing well in beautiful Vermont.
fia
New member
Herning, Denmark
- Aircraft Type
- Other
Re: The "8 Knot Mod"
Hi Jim,
I am really wondering if you change the incidence of the horizontal tail, will it not change the stability of the plane in adverse direction? I am aware that the stabilizer produces downdraft and hence drag, but this is done for a reason.
Is your mod working because the original downdraft is simply overdone and the plane can tolerate less without becoming unstable? What happens in FL250, is it still OK?
Finn
Hi Jim,
I am really wondering if you change the incidence of the horizontal tail, will it not change the stability of the plane in adverse direction? I am aware that the stabilizer produces downdraft and hence drag, but this is done for a reason.
Is your mod working because the original downdraft is simply overdone and the plane can tolerate less without becoming unstable? What happens in FL250, is it still OK?
Finn
- Aircraft Year
- 1974
- Aircraft Type
- 112 Hot Shot
- Reg Number
- N1144J
- Serial Number
- 186
Re: The "8 Knot Mod"
Are you turbocharged? If not, you will be going so dog slow at that altitude it won't make any difference anyway. The "8 Knot Mod" on naturally aspirated Commanders is only going to be helpful within a certain altitude range. Once you are above that range the horsepower loss will counter any benefit. When the mod was originally put into practice, back in the 90's by Robin MIley, it was done on a turbonormalized Commander, so the benefit was realized at all altitudes.
Are you turbocharged? If not, you will be going so dog slow at that altitude it won't make any difference anyway. The "8 Knot Mod" on naturally aspirated Commanders is only going to be helpful within a certain altitude range. Once you are above that range the horsepower loss will counter any benefit. When the mod was originally put into practice, back in the 90's by Robin MIley, it was done on a turbonormalized Commander, so the benefit was realized at all altitudes.
South Burlington, VT
- Aircraft Year
- 1978 580
- Aircraft Type
- Super Commander
- Reg Number
- N555LP
- Serial Number
- 14405
Re: The "8 Knot Mod"
Hi Finn,
Stability is improved with SuperStream because the elevators (and tabs) cruise in a neutral position. SuperStream Commanders find, and maintain the "step" more easily.
Our mod works by achieving the same "downdraft", as you call it, with all surfaces in stream, stab-elevator-tab, instead of stab down, elevator down, and tab up. We simply do the same downward lift job, but with less drag. The dividend is greatest in the regime of small elevator deflections. As deflection increases, such as in a climb, or descent, the benefit is less.
There are 18 SuperStream Commanders now in service, with no reports of handling issues. I know of a few SuperStream Commander owners who regularly cruise in the high-teens, but am not sure if anyone has flown at FL250. I don't expect any issues.
Jim
Hi Finn,
Stability is improved with SuperStream because the elevators (and tabs) cruise in a neutral position. SuperStream Commanders find, and maintain the "step" more easily.
Our mod works by achieving the same "downdraft", as you call it, with all surfaces in stream, stab-elevator-tab, instead of stab down, elevator down, and tab up. We simply do the same downward lift job, but with less drag. The dividend is greatest in the regime of small elevator deflections. As deflection increases, such as in a climb, or descent, the benefit is less.
There are 18 SuperStream Commanders now in service, with no reports of handling issues. I know of a few SuperStream Commander owners who regularly cruise in the high-teens, but am not sure if anyone has flown at FL250. I don't expect any issues.
Jim