- Joined
- Mar 17, 2007
- Messages
- 758
- Reaction score
- 47
Guys,
My IA has some questions about the legality of the stroked C-85 installation. I know it's still just a C-85 which is authorized as per the TCDS. I'm also turning a new Sensenich 76AK-42 metal prop which is also on the TCDS. I think his question is what are the limitations imposed because it obviously has more power than the A-65 it replaced.
I know the tach must have a new red line to replace the previous 2,300. I don't have the TCDS in front of me, but I believe it was 2,575? Other than that, I'll have to sift through the Don's Dream Machines paperwork for a better explanation that will clarify it or him.
In any case, I was looking for an easy explanation to articulate to him that just because it can make more power doesn't mean I can legally apply that much power, etc. I'm guessing that it might be entirely possible that my current engine/prop combination might exceed the TCDS specified limitation of 2,550 rpm static? Does that mean at full static throttle I can't exceed that rpm? The only solution i can think of would be to re-pitch my beautiful, brand new 42 prop. I'm hoping very, very hard that this isn't going to be the case.
lastly, after going through the paperwork that DDM provided thee original purchaser of the engine, it has 2 STCs, one for the conversion of a series of -12 engines to -8s, and also another STC for installation of O-200 an crank, connecting rods, and pistons in a C-85. Stapled to the STCs are 2 accompanying 337s from the original purchaser's FSDO with he and his ill-fated Cub's registration number. Since the C-85 is on the TCDS I was under the impression that an STC wasn't required. I also called DDMs to see if I needed to get the 337s applied in my name and for my Cub. He said it wasn't required, but why then was it provided in the first place? Any other C-85 stroker owner's inputs or experiences would be greatly appreciated.
I promise, I started out just asking about range markings on a tach and just got carried away...
Mike-
My IA has some questions about the legality of the stroked C-85 installation. I know it's still just a C-85 which is authorized as per the TCDS. I'm also turning a new Sensenich 76AK-42 metal prop which is also on the TCDS. I think his question is what are the limitations imposed because it obviously has more power than the A-65 it replaced.
I know the tach must have a new red line to replace the previous 2,300. I don't have the TCDS in front of me, but I believe it was 2,575? Other than that, I'll have to sift through the Don's Dream Machines paperwork for a better explanation that will clarify it or him.
In any case, I was looking for an easy explanation to articulate to him that just because it can make more power doesn't mean I can legally apply that much power, etc. I'm guessing that it might be entirely possible that my current engine/prop combination might exceed the TCDS specified limitation of 2,550 rpm static? Does that mean at full static throttle I can't exceed that rpm? The only solution i can think of would be to re-pitch my beautiful, brand new 42 prop. I'm hoping very, very hard that this isn't going to be the case.
lastly, after going through the paperwork that DDM provided thee original purchaser of the engine, it has 2 STCs, one for the conversion of a series of -12 engines to -8s, and also another STC for installation of O-200 an crank, connecting rods, and pistons in a C-85. Stapled to the STCs are 2 accompanying 337s from the original purchaser's FSDO with he and his ill-fated Cub's registration number. Since the C-85 is on the TCDS I was under the impression that an STC wasn't required. I also called DDMs to see if I needed to get the 337s applied in my name and for my Cub. He said it wasn't required, but why then was it provided in the first place? Any other C-85 stroker owner's inputs or experiences would be greatly appreciated.
I promise, I started out just asking about range markings on a tach and just got carried away...
Mike-
