MT Propeller

AK_Mauler · Post by **AK_Mauler** » Mon Jan 30, 2012 10:08 am

I am very curious how well this prop performs. I am stuck with the solid crank O-360 so it would be mega bucks for my conversion. I really hate flying at 110 mph at 2500 rpm with the throttle pulled way back! Would be nice to put those ponies to work without reving the engine too high, easy to exceed 2,700 if you are not paying attention.

maules.com · Post by **maules.com** » Mon Jan 30, 2012 4:46 pm

Some members here are using a longer prop on the C4F engine, fitted on a field approval I believe.
Much improved takeoff and climb is reported.
Possibly this same prop set up with a little courser pitch might be the ticket.
Hopefully one of the users will shed a light on it here.

Russnrenea · Post by **Russnrenea** » Sat Jun 16, 2012 4:27 am

Does anyone know if MT/Maule is looking at getting STC approval for the M5-180C with the O-360-C1F? I'm looking at an overhaul soon and also installing a "B" hub on it. I would rather use that money towards a really cool prop.

Russell
N141AR
M5-180C

maules.com · Post by **maules.com** » Sat Jun 16, 2012 8:43 am

MT and Maule are communicating as we speak.
Check with MT then Maule engineering.

Mr. Ed · Post by **Mr. Ed** » Sat Jun 16, 2012 9:56 am

Things may have changed very recently, you'd have to check with the MT folks but..........I recently (since January) inquired about the MT prop for the O360 C1F. What I was told by the MT guys in WI was that they were expecting approval of the STC very soon for the 2 blade MT prop on the Maule. What was not in the works, hasn't been started or even seriously considered, is an STC for the 3 blade 78" MT on the Maule.

I bought the 3 blade and just got it installed about a week ago on a field approval. Still evaluating the performance of the prop at this point. Will post more information as I play with it more. Initial impression is that the initial takeoff acceleration is significantly increased. Nice not having the rpm restriction in cruise.

Mr. Ed

Duane · Post by **Duane** » Sat Jun 16, 2012 1:29 pm

Those who have facebook, look at the Maule page. We just installed a 80" 3 blade MT prop under a STC on a C1F. Not sure who holds the STC. but looks pretty nice.

NZMaule · Post by **NZMaule** » Sat Jun 16, 2012 10:00 pm

Hey that looks awesome Duane, nice bit of footage and flying posted on the Facebook page! Be good to know the performance specs in due course (take off and if anything is given away in cruise) and weight.

cooker · Post by **cooker** » Mon Jun 18, 2012 9:26 am

we put a two blade MT on our experimental. Old prop was unserviceable and MT was the about the only logical replacement primarily due to the light weight and the compatibility with our engine. We went with the 2-blade because Flight resource suggested that a 2-blade would provide better short field and float performance for engines under ~275hp. Beyond 275 the 3 blade would be the logical choice. The reason for this was the blade has a large profile and the drag of a 3rd blade counters the thrust it produces until you get to the higher power where 2 blades can't efficiently handle all the power ...... makes sense i guess ..... im not an expert this is what i was told.

When i asked why the husky guys all have 3 blades on their 180hp engines i was told "because they look sexy, and those guys have lots of money"

I only have about 5 hours on the prop now so I won't offer much of a report yet although climb and take off do appear better, we also made quite a few other changes to the aircraft at the same time so its hard to say how much of the better performance is due to the prop.

I have not experienced the "extremely smooth" operation that lots brag about yet. We will have it dynamically balanced next week if the weather smartens up and hopefully we can really test it out so that i can provide a better pirep.

Sam Rutherford · Post by **Sam Rutherford** » Thu Dec 06, 2012 8:36 am

I would advise caution before sending any funds or ordering anything from Erik - just check on both the product and the timescale of supply. Nobody wants a nasty, expensive, surprise.

Fly safe, Sam.

bobguhr · Post by **bobguhr** » Wed Feb 28, 2018 6:09 pm

Im buying a two blade prop from MT and part of the process involves measiring distance between the trailing edge of the existing spinner to the engine crankshaft flange, distance between the engine cowling and the engine crankshaft flange, distance between trailing edge of existing spinner to engine cowling and the top cowling trim angle in relation to the the plane of the spinner. Just as much if not more of a PIA than it sounds to measure accurately. Has anyone installed a two blade MT on their O-540 J1A5D 235hp
Maule? Mine's an M6. MT referenced three part 's for similar but slightly different spinners, the MT #'s are P-271-2-C P-902-4. and P-277-3
Can anyone share which spinner part # was used on their similar install?

maules.com · Post by **maules.com** » Wed Feb 28, 2018 6:16 pm

The hand laid up cowlings are often different from one another so the measurements are of the specific airplane.
MT props are fitted on IO540 W engines which have the same upper frontal dimension as the O540 however the air intake area should be checked.
Recommend the 83" version not the 78".

bobguhr · Post by **bobguhr** » Wed Feb 28, 2018 6:39 pm

Kind of what I thought, I took the measurements of my specific install and I'm trying to cross check with other installs to see if I come up with the same MT spinner model. I ordered an 84" MT as that is the limit of their TC according to the folks,specifically Larry Schlassinger, at Flight Resource.

Mog · Post by **Mog** » Wed Feb 28, 2018 7:23 pm

Just a point of interest, I have been made aware that MT props can be a serious pain due to leaking. Would love to have an MT, but not at the cost and hassle I have heard about recently.

bobguhr · Post by **bobguhr** » Thu Mar 01, 2018 2:37 am

Easy Mog no Jinxing allowed. I''m keeping the 81" MAC on the shelf for contingencies just in case S--T happens

DeltaRomeo · Post by **DeltaRomeo** » Thu Mar 01, 2018 5:49 am

Got 70 hours on the 2 blade MT on an O-360. No leaks. Smooth ops and no rpm range limitation (and no AD). When Hartzell condemned my hub, I couldn't locate ANY serviceable Hartzell props on the market so we were looking at buying a new Hartzell: $12K for the same set of problems. For 2K more the MT was a lot more attractive; lighter, smoother, more performance, and no rpm operation limitation. With the nickel leading edge it is a great prop. After installation, I had the balance checked and out of the box it was at .18 ips; dialed it down to .05 ips. Also learned that the tachometer was reading 200 rpm low. Not much in the way of legal options for its replacement with a digital tach without buying a whole EIS system (thread drift...). The low pitch stop from MT is set at 5.5Âº; the Hartzell was set at 12Âº.

As far as spinner clearance goes, I just measured the distance from the trailing edge of the Hartzell spinner assembly to the prop mounting flange and picked the choice from MT that was the closest match to that dimension. Worked out fine.

MT Propeller

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