Kevin

I strongly suggest looking into this one: https://hartzellprop.com/products/top-prop/mooney/m20a-g-m20j-2-blade/ Increased cruise speed, eliminates the placarded range on the prop using F7666 blades. Prop kit includes new spinner.

Right now it's a done deal. Edo-Aire out, Hartzell in. Theyre just trying to figure how to make it work with the control calbe.

I got called by a shop who replaced an Edo-Aire governor with a Hartzell governor (I think it was a D-1-6). Apparently, the Edo-aire governor control arm moves CCW to low pitch (High RPM), CW to high pitch (Low RPM). The Hartzell governor is the opposite. The customer needs to re-rig his cable, re-orient the governor hear, or something to allow this governor to be used. Any ideas? I'm having trouble seeing how this could happen, or not be addressed in the Money manual, as the M20F was TC'd with either governor.

Good advice from testwest. Also, you need to remember that if you added/removed weight when you did your dynamic balance, your balance will be off when you re-index the prop. The best thing to do would be to re-dynamic balance your prop first in the new index position, and then take your flight. That way you'd be comparing apples to apples.

Thanks for your help. I suspect he actually has a Hartzell spinner, but I need to confirm that with him. The parts book was very helpful. Thanks a lot!

I have a customer who has an M20F modified to an M20J (his words, not mine - I expect he has the "J" cowl mod.) He needs a new spinner, and claims the part number for the spinner bulkhead is 630031-029 and the dome is part number for the spinner bulkhead is 680031-019. My problem is that the TCDS for the "J" shows a P/N of 680031-507 for the spinner assembly, which is the spinner bulkhead, dome, screws, etc. Does anyone here know if the spinner assembly 680031-507 consists of 630031-029 & 680031-019?

The flange is not the same as on the 360. I'm hoping someone else has already gotten a field approval, then I can direct my costomer to that individual. It's much easier to get a field approval if it has already been approved on another plane of the same type. You can basically walk in to the FSDO and say "I want to do this to my plane as well."

Hartzell does not have any info other than the approved propeller - Hartzell is aware of no STC's for an alternate propeller on this aircraft.

The Twinkie prop is feathering. No need to put it on - extra weight & complexity, but there are plenty of similar non-feathering props that could be installed if someone had a previous approval. Getting an approval nowdays is almost imposible.

Thanks for the tip, Skybrd, I'll call the customer and refer him to this site. I'm afraid, though, that if the plane has been sitting for years that the prop may be as bad as the one he already has. I was really hoping that someone had gotten an STC or field approval for a "modern" prop for this bird, but it's not looking so good . . . It seems like the logical replacement would be a Hartzell aluminum prop, but the TC for the prop doesn't show an approval on a "straight" O-320, so getting a field approval won't be easy, if it ever is.

Your "B" model has a 360. The 320 will take a Hartzell, but the Hartzell it allows is more expensive than the plane!

I got a call from a customer last night who bought a 1956 M20. It has an O-320 engine (that's it, an O-320, not an O-320-A3A or any other suffix, just a plain old O-320, no suffix) He's got an old Hartzell steel hub prop, and the prop shop has told him its "shot," so he's looking for another propeller. Unfortunately, his only option is another Hartzell steel hub prop (per the TC). I couldn't find any STC'd prop for this application, and the new Hartzell steel hub prop is quite pricey. It seems to me his best option would be to install an aluminum hub compact Hartzell or McCauley. Has anyone out there gotten a field approval to install an alternate prop on an old M20?

Hank: Continuous means just that, continuous. "two minutes in the pattern" is continuous. You can "pass thru" the placarded range, but you can't operate there. Period.

It shouldn't be. You should have the same placard as John - no continuous operation between 2000-2350. Where are you getting the placard you claim to have? If it's from the Mooney POH or Operation Manual, I believe they changed that limit. Just for the record, let's look it up ourselves, shall we? Follow this link: (from FAA Website) http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/45911b31a312cf79862576e8004c87c7/$FILE/P-920.pdf This is the Type Certificate Data Sheet for the propeller. Go almost all the way to the end of the TCDS (page 8 of 13), and you will find a find a paragraph called "Note 9." This shows the propeller/engine combinations that are approved, and any placards that apply to that propeller/engine combination. These placards are applicable on your Mooney, Piper, homebuilt, golf cart, you name it. If those propellers are used on those engines, those limits apply. Your prop will appear on page 9 of 13. You should be operating an HC-C2YK or HC-C2YK propeller with F7666(A)-2 blades. Find your prop model in the first column, then the blade in the second (note that the -2 is missing, but that's not important right now). Find your engine in the third column (it's the fourth set of engines from the top on page 9 of 13). Read the placard in column 6: "Avoid continuous operation between 2000 and 2350 RPM." That's all there is to it.

Ask me anything you want about this topic. I'm the guy who responded to John. What prop/engine/model Mooney do you have, Marauder?