Engine upgrade

[Ben1946]

Need info. on paper work to up grade my 1946 BC12 Taylorcraft from a C75 to a C85 - C90 or a 0200. And can I do this without changing the cowling an engine mount.This is my first plane and I,am taking lessons it, but would like to have radios an starter,

[Pearson]

Re: Engine up grade

Suggest you contact Mr. C.R. Harer at [email protected]. He owns the stc to install a C-85 with electrical system.

[paulp]

Re: Engine up grade

Howdy Ben,

You can go to a larger engine with the proper STC; however, you most definately will have to change the engine mount and the cowling if you add an electrical system. The gererator will require that engine be moved 4" forward, ergo, new mount. New mount means new cowling or you can modify the existing cowling by adding 4" of sheet alum. That's what I did and it's ok but I'm not that happy with the result. The Harar STC will allow for the installation of an 85 TCM and the accompanying electrical system and then you can modify the 85 with the 0200 STC(o200 crank, pistions & rods) &you will then basically have an 0200 or 100hp. Again, that's what I did and I am very pleased with the results. Of course, this also means an new prop, tac and new tac cable, ammeter, volt meter, primer line, fuel line and oil pressure line and so on. It ain't no small trick and it ain't cheap-but damn, it's worth it!! I took my first flight, after the mods, in Aug of this year and I smile everytime I leave the ground.

[jgerard]

Re: Engine up grade

I have seen info regarding the 0-200 / non electric / no gross weight increase STC but I have never spoken with anyone who has done the conversion. I'll try to contact the owner of the STC sometime this week to get more info.

Jason
N43643


STC Number:
SA5028NM

This certificate issued to:
Dutton William A

STC Holder's Address:
15156 Rancho Vicente Road
Ramona CA 92065
United States

Description of the Type Design Change:
Installation of a Continental O-200-A engine, McCauley 1A101/DCM propeller, and associated installation components. Limited to installation on serial number 7274 ONLY.

Application Date:
06/19/89

Status:
Issued, 02/08/1991

Responsible Office:
ANM-100L Los Angeles Aircraft Certification Office Tel: (562) 627-5200

TC Number -- Make -- Model:
A-696 -- Taylorcraft Aviation, LLC -- BC12-D

[jgerard]

Re: Engine up grade

Well tribe,

After a long conversation with the LA FAA branch office about the above STC here is what I found out.

One time use, not applicable to any other SN aircraft than 7274

The aircraft had previously been converted to a model 19.

The aircraft was destroyed and the airwothiness certificate was surrendered.

Someone in FL bought the plane and has placed a reserve on the registration # Let's hope she will be back in the air soon.

This STC contained lots of hand drawings specific to SN 7274 and it's previous modifications, so it's likely it can not be used as reference data to obtain a 337 for installing a 0-200 in a stock bc12d

Jason
N43643

[Jim Herpst]

Re: Engine up grade

NO ONE is currently stepping forward to support a Non electrical install in a T craft . Too bad its been done and the results on a light bird will make you wanna cry as the homesick angel flys climbs like ....well the best damn plane she is for the money. Nothing will surpass her. With the STC for the 0-200 crank AND a new cam I hate to think what the results would be !! Jim "its worth going expermintal for"

[Acroeric]

Re: Engine up grade

You know. . . . .the STC process is a bit of a pain but you would think we as a group could apply and get a STC for the installation of an 0-200 in the BC12-D and maintain the gross weight. . . .

I happen to have knowledge of the process if anyone has else has interest just let me know. Maybe we could pool our resources and get it for the Tcraft Club.

I just got back from flying my old BC12-D with the C85. We were flying formation with a J3. . . .I was turning 1800 rpm to keep from leaving him- what a plane! Luckilly my friend bought it and I get a bit of time every once in a while.

[Dick Smith]

Re: Engine up grade

Eric, could you throw out a wild guess at the $ involved in an STC such as you mentioned? Just something that would indicate what "might" be involved?
I'm not trying to pin anyone down...just trying to get a handle on the cost picture....$5000.00?? $150,000?? Some of this stuff is not exactly rocket science...but present day costs are sometime surprisingly high. Thanks...Dick

[Acroeric]

Re: Engine up grade

Dick- from what I have seen it varies considerably. If you change weights, moments, loading, or the basic design it could be very costly with engineering data, flight test, etc etc etc. I have always thought that an STC for the O-200 could be done efficiently if you left the cowling, weight, and other aspects the same and just increased the horsepower. There are a few minor design changes that would have to be addressed like the fuel line diameter and exhaust but for the most part it will bolt on. I know it will bolt on because my Swick Tcraft had a stock firewall forward with the exception of a Luscombe 2 piece exhaust. The data is already done in the Swick STC for the O-200 but Mike's STC includes all the other stuff. Unfortunately you can not just accomplish portions of any STC, you have to do the entire thing.

We (FAA) are currently doing one time STC's for the more complicated field approvals. My experience is limited to this type of STC but it is the same process. There is a good advisory circular that describes the process start to finish. The STC is worked through your regional ACO (Aircraft Certification Office) and is accomplished using FAA Engineers instead of inspectors like myself. The FAA assigns a project manager to work with the person submitting the package to help them along. If I were to start the process I would call the ACO and ask for the antique aircraft guy.

If we get the changes in 43.13 that we want this will all be possible following the AC.

I still feel there is a good arguement for a logbook entry C-85 installation on any BC12-D per the Type Certificate if you maintain gross weight.

Forrest- any thoughts?

[Yellow Duck]

Re: Engine up grade

I certainly would be interested.

[Jim Hartley]

Re: Engine up grade

I am interested as well!

Jim

[Don Eide]

Re: Engine up grade

I think the best way to go is the Harer STC for the BC12D-85.
It includes a couple spar mods, front and rear Strut Fitting mods,
new front and rear Butt Fittings, a right wing tank, (left optional)
check for 5/16 I.D. fuel lines, and an C-85-8 (non electric) engine.
Thats it. Now if you want an electrical system, the work really begins.

For an engine, why not call Don's Dream machines in Griffion, GA.
He has the STC to put 0-200 parts in a C-85 which dynos out at 97hp.
Thats almost a 0-200. Everything is STCed.
Just my thoughts.
Don

[Jim Hartley]

Re: Engine up grade

Don and tribe,

I just got home from talking to a friend who just retired from the FAA as an inspector and his response to me,after reading the posts on this thread,was the same as yours, Don. "Contact Don's Dream Machines".

For those of us with the light birds(non-electric)and our bodies weighing in at the FAA standard of 170# or less I think the C-85 is just fine. Works for me!

Come overhaul time though...????

Jim

Don,
I just looked for a web site and no luck...do you have a phone number?

For an engine, why not call Don's Dream machines in Griffion, GA.
He has the STC to put 0-200 parts in a C-85 which dynos out at 97hp.
Thats almost a 0-200. Everything is STCed.
Just my thoughts.
Don

[crispy critter]

Re: Engine up grade

I think we should consentrate on a bolt on STC for the C-85-8 with no electric,no gross weight increase,and no major airframe mods.I'm about to get mine approved(I hope)and I'll help all I can.

[Jim Hartley]

Re: Engine up grade

Kevin, in your case you are talking about a "Field Approval",correct?

Jim