MT Composite Prop STC

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MT Composite Prop STC

Postby JohnNielsen » Tue Feb 14, 2017 12:02 am

The STC that approves the MT composite hydraulic constant speed propeller has recently been amended to approve installation on all 170/172/15 series aircraft that are powered by ANY version of a Lycoming -360 series engine and any hydraulic governor. Two props are currently available. A 83" 2-blade and a 79" 3-blade version.

See the data sheets on the STC Holder website:
2-blade: http://flight-resource.com/Datasheets/C ... 2Blade.pdf
3-blade: http://flight-resource.com/Datasheets/C ... 3Blade.pdf

I had the luxury of trying both of these and the Hartzell Trailblazer on the same day on my plane to evaluate take-off, climb and cruise performance having previously tested the 83" 2-blade vs the 80" Hartzell Metal prop and the 76" Hartzell Metal prop. My plane is a 1955 C170B with a new O-360, Lycon polished cyl, lots of monitoring equipment and other mods.

I selected the MT 3-blade to keep for my plane. I loved the smoothness and quiet vibration free operation. It has the shortest take-off roll to lift off. The 2-blade MT was faster in cruise by about 5mph and a bit lighter, but I simply loved the way the 3-blade would operate at low RPM's and the sexy look! They are now building them with a stronger Nickel-Cobalt Leading edge that I have seen cut clean trough a steel tow bar with damage limited enough the owner was able to fly that pro home! Back in 2010 they changed the Kevlar wrap process to eliminate any chance of surface cracking in the epoxy/paint top coats and last year began using a new paint formulation that is really holding up well to use in hard rain. The 2-blde price is just under $14K. The 3-blade is about $2K more.

Best regards and Happy Flying!
John Nielsen
http://www.Flight-Resource.com
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John's Super 170B w/ 180+HP and MT Composite Prop.
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Re: MT Composite Prop STC

Postby gahorn » Tue Feb 14, 2017 8:30 pm

JohnNielsen wrote:The STC that approves the MT composite hydraulic constant speed propeller has recently been amended to approve installation on all 170/172/15 series aircraft that are powered by ANY version of a Lycoming -360 series engine and any hydraulic governor. ...


ANY...??? or "any approved"....? :wink:
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight.
An originality nut (mostly) for the right reasons. ;)
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Re: MT Composite Prop STC

Postby JohnNielsen » Fri Feb 17, 2017 3:53 pm

The STC is a 'propeller change' STC. It is approved replacing ALL existing propellers with the MT as long as you have any version of a Lycoming -360 engine. Literally on the STC it shows approved engines as "Lycoming [ ]-360[ ] Series Engines".
John
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Re: MT Composite Prop STC

Postby c170b53 » Fri Feb 17, 2017 4:41 pm

Have anything for a 0-320 in the 80 inch range?
Jim McIntosh
1953 C170B S/N 25656
1979 172XP. S/N R1723135
02 K1200RS
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Re: MT Composite Prop STC

Postby gahorn » Sat Feb 18, 2017 6:34 pm

JohnNielsen wrote:The STC is a 'propeller change' STC. It is approved replacing ALL existing propellers with the MT as long as you have any version of a Lycoming -360 engine. Literally on the STC it shows approved engines as "Lycoming [ ]-360[ ] Series Engines".
John


John, my question is in reference to the propeller governor statement. It is unlikely that the MT propeller is actually approved to use "any" prop governor. (There are far too many propeller governors in the world which will not properly operate the MT prop.)
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight.
An originality nut (mostly) for the right reasons. ;)
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Re: MT Composite Prop STC

Postby JohnNielsen » Wed Mar 22, 2017 4:31 pm

George, There is a MT Prop factory bulletin referenced in the TCDS of the MT props that is a list of every governor known and as new ones come to market, they add them. The MT prop only requires simple oil pressure to increase pitch. All standard governors do this. I used the MT governor in my project because of the low weight and compact size.
John
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