BC-12D from A-65 to O-200

[David Price]

It's is now time to concider keeping the two A-65's and pickle them and going to a C-90 or an O-200 or get one good one out of the two A-65's.
Would like to have more power and climb pull.

Have read most of the old postings.

Any current info and input from the tribe is welcome!

[barnstmr]

Re: BC-12D from A-65 to O-200

David,
I intend to do the same with my BC12-D. But I have been holding out because I got involved with the engine upgrade STC on L-2's and because I have been waiting and hoping that the Harer STC would become available. In a few months, I will get more serious about what to do with my airplane. If nothing develops on the Harer C85 STC, I may bite the bullet and start the long process of STC approval for my airplane.

A C90 or O-200 would be a sweet deal. The C90 is rated at 95 hp for 5 minutes for Takeoff and 90 hp continuous. Structural approval is necessary and FAA will look at the fuselage changes Taylorcraft did when going to the model 19. Some fuselage mods might be necessary to substantiate the fuselage structure. The original mount and cowling could be retained if you use a C90-8F. The long mount and long cowling is necessary if you use a C90-12F or O-200. Starter would be a nice feature.

Forrest,
Any word on availability of the Harer STC. I would be glad to help if any new FAA approval work is needed to get it done. Have you had any luck in obtaining the rights to the data?

[David Price]

Re: BC-12D from A-65 to O-200

Terry,
Thanks for the info.

[Robert Lees]

Re: BC-12D from A-65 to O-200

I have a lot of previous (historical) US "approved data" on fitting an 0-200 on an A-65 mount. There are several one-time STC's to support this. These were sent to me in confidence, so are not for general consumption...but I can put anyone in contact with the original STC owners, for their permission (if they are willing) to publish further.


The UK authorities saw fit to make it harder than was really warranted, so I've ended up going for the C-85 (93hp) upgrade, which has been approved, along with the 1280lb increase (I have the hardware upgrades too).

I have a pickled nil-time Rolls Royce O-200 sitting in my garage as a result of the UK indecision...harrumph!

Anyone want to buy it? Cheap for US buyers, now that the £ has fallen through the floor.

[Ragwing nut]

Re: BC-12D from A-65 to O-200

Terry, we field approved the O-200 install on my Deluxe, and my uncle field approved a C90-8 on another years ago. For that matter we field approved O-235 as well. I have all the N numbers when and if you need them.

No mods required to fuselage on postwar models, only prewar. Postwar all that is required is the strut attach fitting mod, and if you don't do the big baggage and gross weight increase no need to X the baggage floor.

Mike

[David Price]

Re: BC-12D from A-65 to O-200

Ok Tribe,
have found an A-65-8F but no data plate. both case #'s match. how does one obtain an exceptiable engine data plate?

[astjp2]

Re: BC-12D from A-65 to O-200

Fresno sells replacements, you will need to find a logbook with the serial number for the engine, the it will require a tear down and conformity inspection, its all up to your IA and what they are willing to work with you on. Tim

[David Price]

Re: BC-12D from A-65 to O-200

astjp2,
Thanks for the info. Shall concider this carefuly.

[David Price]

Re: BC-12D from A-65 to O-200

Well it comes back that out of two engines, 4 cyl are toast and the other four are in need of costly repair. Both cams are good as well as both cranks and cases.
Looks like new cylinder kits this time

[David Price]

Re: BC-12D from A-65 to O-200

Now have two (2) A-65's (1) -8 & (1) -8F both with new Superior Millinium Cylinder Kits. They sure am pretty. I guess I was lucky to find the last two Superior Kits on the market.

Hope that the airframe work will be completed by May.

Did I mention that I am now broke!

[tim]

Re: BC-12D from A-65 to O-200

wow there is new work on an stc sorry i have been gone from the forum foer some time whats up with the stc ???

[senior]

Re: BC-12D from A-65 to O-200

No mods required to fuselage on postwar models, only prewar. Postwar all that is required is the strut attach fitting mod, and if you don't do the big baggage and gross weight increase no need to X the baggage floor.

Mike

I know this is an older thread but curious what this "strut attach fitting mod" is?? I to plan on a no electric 0-200, or 85 depending on what I can pick up.

[Ragwing nut]

Re: BC-12D from A-65 to O-200

I know this is an older thread but curious what this "strut attach fitting mod" is?? I to plan on a no electric 0-200, or 85 depending on what I can pick up.

there is a plate that gets welded to tie the strut attach fittings on both sides of the spar together. I thin it is suppose to be .080 4130 plate

[Pearson]

Re: BC-12D from A-65 to O-200

Senior,

The "strut attach fitting mod" is a part of a larger mod you may have heard of called the Harer STC. Using this STC one can install a C-85 engine and, increase the gross weight to 1500 lbs by moving the engine forward 4". Or you can install the C-85 in the original location and increase the gross to 1280 lbs. You can do a search on this site for Harer STC and get a lot of info.

I would like to suggest that, even if you don't want to do the Harer STC, you do the portion of it which would be impossible or very difficult to do after you recover. Those portions would be the addition of an additional cross brace between the lower longerons beneath the baggage area, the installation of larger bushings in the wing spar, and the addition of small plates welded between the spar straps (attach fittings) at the wing attach and strut attach points.

If you want to do the complete Harer STC, you will have to wait awhile. Mr Harer recently died and the STC is now in limbo. Some say you can do all of the mods and use the STC as approved data to get them approved. I do not know about that. I feel that would usurp the whole STC process. But, if you do the mods I suggested, and later obtain the STC, you could legally apply the STC to your plane. Even if you never obtain the STC, you could have piece of mind knowing your larger spar bushings are approved for up to 1500 lbs.

PM me if you have more questions or need more info.