Tom Antlfinger
Posts: 1805
Joined: 12/10/2001
From: Fond du Lac,
WI, USA
Status: offline
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A little history here.....
Don and David are both right....depending on how you interpret, or more accurately, how the AMA and it's insurers interpret 513/17........"provide manufacturer documentation" specifically.
About 4 years ago, when the first KJ-66 engines appeared that were capable of 120N(read P-120) there was allot of discussion on RCO and RC Digest about whether user detuning was acceptable, OR whether the intent of the AMA was to "provide manufacturer documentation" that the max RPM was set at the factory, and not restorable by the end user.
At one point this became quite testy, since it got into the RAM vs JETCAT debate, since when the P-120's first came out and I got mine(5th one into the USA), I was one of very few people who could really exceed the 0.9 limit on allot of different planes with a KJ-66 size engine, since RAM was still running only about 17-18 lbs on their 750F's at the time. I was INFORMED by a couple of high-profile RAM owners(David not included) at Superman that I was totally illegal if I just turned the RPM down.....even threatened to check me during my entire flight....be sure I didn't flip a mix switch to bring back full RPM ......report me to the AMA.....pure nonsense, deserving of a finger-flag.....and it all disappeared when RAM finally brought out their 120N engines.....and was finally put to rest at last when everyone "Made the switch".....thanks for little favors!!
Until we hear differently from the AMA via a 513/17 Rule Change, end users apparently can use the charts to set their MAX THRUST and, by the same token, are also allowed to set their speed limiters.
If an individual chooses to violate the T/W Rule, then it's ultimately between him and the insurance company anyway, if there is a claim.
Tom
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Setting max rpm for P 120 - 
