MT composite Prop

Today I got an email from Hercules Propeller in the UK. I sent them a pic of the prop I fell in love with which was this composite MT I saw on this red 108-3.  

Below is the email I received from Hercules today and it sounds like they can make this happen for just a little over $2000!

Hi Will, Yes we can.  We can effectively use the same design which performed successfully on Darrell’s 108 although manufacture it with the sweeping plan-form.  It will effectively be the same prop aerodynamically.  No problem to finish the prop in gloss black and square tip to look like the aircraft in the picture you sent.

Rupert Wasey
Managing Director
Hercules Propellers Ltd
+44 (0) 1453 885853

So they would take this design prop, square tip it, and paint it Gloss Black! Now I just need to come up with a spinner…..

Another option may be Catto Propellers.
Categories: Prop

Will Ware

Will Ware

I live in Rockwall Texas and I’m rebuilding a 108-1. I’m a Captain at Southwest Airlines but I LUV taildraggers.


John Hanson

John Hanson · October 9, 2018 at 4:38 pm

How do you propose to certify this?

    Will Ware

    Will Ware · October 10, 2018 at 10:04 pm

    Well, Hercules has an STC for the 108 and even with out it, as the aircraft was certified under CAR39, I really only have to meet the diameter requirements in the Type cert. Do you agree?

    Will Ware

    Will Ware · October 11, 2018 at 9:08 am

    In the TCDS it says under ‚propellers‘:

    „Sensenich 76JA-53, 76JR-53 or any other fixed pitch wood propeller, which is eligible for the engine power and speed and which meets the diameter and static r.p.m. limits given under “Propeller limits” (for 6A4-150-B3, -B31, or 6A4-165-B3 only).“

    So, according to my understanding, neither STC nor 337 is necessary as long as the wood prop meets the dimensional and RPM limit requirements.

      John Hanson

      John Hanson · December 13, 2018 at 11:07 pm

      I’d do some checking with the feds first…..We just had a discussion on this over on and the FAA isn’t going for that anymore. They say the prop isn’t a legal prop because it has a composite construction…wood core and composite cover. It’s a bummer because there’s quite a few Super Cubs running Catto and other brand props. So Catto has decided to pursue an STC for certain aircraft.
      We knew it was too good to be true for long…. 🙁

Will Ware

Will Ware · December 15, 2018 at 3:19 pm

Thanks John, yeh after some more research on the TC of the 108, I can no see that would be a stretch. I still would LUV to find a way to pull it off.

I guess I will go with the wooden Hercules from the UK.

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