Engine Upgrade Cost

[PA1195]

Re: Engine Upgrade Cost

Got a soft spot, that's the problem.

I wonder if an A-75 could be installed, or an A-65 upgraded to that configuration without the CAP STC fuselage mods? Might take some engineering stress and fuel flow analysis?

May be more here:

http://www.bowersflybaby.com/tech/fenton.htm

https://www.cubclub.org/tc/Continental/E-205,%20A65.pdf

https://www.cubclub.org/tc/Continental/E-213,%20A75.pdf

If not then pursue a tight A-65 with the right prop in a light fuselage with VG's.

Gary

[astjp2]

Re: Engine Upgrade Cost

I flew about 500 times out of D66 between '06 and '09, also landed in one of those fields out east of there along the Tanana, it was soft enough dirt that with 8.50's on it I about put her on its back. Had to use full throttle to taxi. It was dry but powder up to my ankles when I stepped out. I was visiting a Major who had a an Orange and brown 170, I landed in the wrong field. Oops. Just taxied out to the road and took off. JW used to give me crap because I would always take off from Delta at a Max climb. Hated fighting the winds when the came over the trees. That is a fun place to fly. Tim

Hi Jim and thanks. This will be my 9th plane (2nd was another '41 - N29694) and likely the last. These old birds can get like Christmas trees adorned with too many decorations...wing loading and #/hp go up and performance suffers. And they're never worth what went into the build.

So we'll see. I'll fly it on wheels to get familiar with the behavior before I put the floats on in a couple of weeks. Will do a review when I get the numbers figured out. It has a Field Approved 74/40 Sen (from my PA-11) mainly for floats and skis, and the new by Custom Aircraft STC'd 85 get it up kit with some C-90 parts so will be all it can be.

My former Taylorcraft also had the Gilberti/Harer mod with a heated up 85...Mac 75/38 prop and some O-200 stuff attached. If I could get to 38 mph it'd fly on floats loaded but the stall was non-VG and had to be paid attention to. I took off in Delta Jct from a farm field I kept it at on wheels and skis and barley (Pun) made it over the pucker brush. Once the crop grew up it really lengthened the roll. I landed at D-66 and the open gear was plugged full of grazing vegetation. It looked like a hungry cow with grass sticking out both sides of its mouth.

I hope the OP of this thread is able to get an I/A to help with his plane's performance. A light 65 T-Craft with the right prop and intake system should do very well.

Gary

[Ragwing nut]

Re: Engine Upgrade Cost

I wonder if an A-75 could be installed, or an A-65 upgraded to that configuration without the CAP STC fuselage mods? Might take some engineering stress and fuel flow analysis?

May be more here:

http://www.bowersflybaby.com/tech/fenton.htm

https://www.cubclub.org/tc/Continental/E-205,%20A65.pdf

https://www.cubclub.org/tc/Continental/E-213,%20A75.pdf

If not then pursue a tight A-65 with the right prop in a light fuselage with VG's.

Gary

you would not really see any difference. Major difference is prop and rpm, internally only real differences are to manage temperature.

[otrcman]

Re: Engine Upgrade Cost

you would not really see any difference. Major difference is prop and rpm, internally only real differences are to manage temperature.

I agree with Mike. You get 75 HP by cutting down the prop diameter to increase RPM. Whatever you gain in engine power you lose in prop efficiency. The net gain is next to nothing, especially in the takeoff run and initial climb regime where thrust is everything.

Dick

[PA1195]

Re: Engine Upgrade Cost

I agree with Mike. You get 75 HP by cutting down the prop diameter to increase RPM. Whatever you gain in engine power you lose in prop efficiency. The net gain is next to nothing, especially in the takeoff run and initial climb regime where thrust is everything.

Dick

Ok guys good to know. I did see the 2600 rpm rating of the 75 and wondered if they changed internals similar to the C-90 vs O-200. Never bothered to dig out the parts manual between the A-65 an A-75 to not any difference.

So, like the Helio Courier, a long prop turning slow is better than a short one turning fast in certain flight regimes.

Gary

[astjp2]

Re: Engine Upgrade Cost

Well think of what the Borer prop is, long and flat. If you want climb like a cub on floats or big tires you want a long prop. Most o-200's went into C-150 type airplanes so they needed the short prop, EXCEPT for the 150 seaplane prop which was 75"x38 pitch, some were 35 pitch. Taylorcraft had the F-19 approved under a note to be able to use a 74" diameter, 43 pitch and the BC-12 series has a 74" diameter approved on wheels, so you CAN put a long prop on an o-200 but not a 85, the longest prop on one of those was 72" 2 inches of length don't seem like much but really can affect climb. Tim

[PA1195]

Re: Engine Upgrade Cost

Well think of what the Borer prop is, long and flat. If you want climb like a cub on floats or big tires you want a long prop. Most o-200's went into C-150 type airplanes so they needed the short prop, EXCEPT for the 150 seaplane prop which was 75"x38 pitch, some were 35 pitch. Taylorcraft had the F-19 approved under a note to be able to use a 74" diameter, 43 pitch and the BC-12 series has a 74" diameter approved on wheels, so you CAN put a long prop on an o-200 but not a 85, the longest prop on one of those was 72" 2 inches of length don't seem like much but really can affect climb. Tim

I've finally got possession of the paperwork and have the 337 for the Sen AK76-2-** if you need a copy.

Gary

[Joe cooper]

Re: Engine Upgrade Cost

I've finally got possession of the paperwork and have the 337 for the Sen AK76-2-** if you need a copy.

Gary

The 65 and 75 hp t craft are underpowered on a short field. There is little difference in the two on climb out, etc. You really need to go to at least an 85 hp to see a decided difference. You can land at a short grass field with a 65 or 75 and be unable to take off. I tried going to a new McCauley prop from a wooden prop on my 65 hp bc12 d, ( a trophy winner in perfect condition) it made very little difference. The answer is more horse power. An 85 makes a big difference in a t craft. Plus......do you like to hand prop? Especially on a hot day or cold day when it refuses to start? for me it got old fast. Electric start is much safer if you fly often. If you want performance , a 65-75 hp TCRAFT is not the answer! I've owned three and tried everything. An 85 - 12 with the Don swords conversion is the answer but I wasn't willing to spend all that money. Better off with a rans courier.

[astjp2]

Re: Engine Upgrade Cost

Gary, For an 85? or the O-200? Tim

I've finally got possession of the paperwork and have the 337 for the Sen AK76-2-** if you need a copy.

Gary

[PA1195]

Re: Engine Upgrade Cost

Gary, For an 85? or the O-200? Tim

C85-12F

Gary

[akndrifter]

Re: Engine Upgrade Cost

My 65 hp with a 74x38 prop was plenty good at short field, just couldn't do it with much of a load though.

[astjp2]

Re: Engine Upgrade Cost

Its amazing how we compare a 65 hp tcraft performance with a 150 or 180 cub...

[labe0202]

Re: Engine Upgrade Cost

Got in touch with an A&P/IA local to me and it sounds like he should be a good fit. Right now I'm planning a metal climb prop, Micro Aerodynamics VG's, doing whatever I need to to get compressions high again (hoping it's rings), and a new intake filter. Gary, you mentioned Donaldson or Challenger for the new intake filter. Any idea of what number the Donaldson would be? On their application guide I see nearly every model except a BC-12D. There's a BC-12D1 which I thought was the same besides a removed door and removed wing tank, but no BC-12D listed. I'm probably missing something though. Hoping to get moving in the next couple weeks. Thanks everyone for helping get my butt in gear.

[PA1195]

Re: Engine Upgrade Cost

Got in touch with an A&P/IA local to me and it sounds like he should be a good fit. Right now I'm planning a metal climb prop, Micro Aerodynamics VG's, doing whatever I need to to get compressions high again (hoping it's rings), and a new intake filter. Gary, you mentioned Donaldson or Challenger for the new intake filter. Any idea of what number the Donaldson would be? On their application guide I see nearly every model except a BC-12D. There's a BC-12D1 which I thought was the same besides a removed door and removed wing tank, but no BC-12D listed. I'm probably missing something though. Hoping to get moving in the next couple weeks. Thanks everyone for helping get my butt in gear.

P10-7150, they're all the same airbox mounting pattern I believe for the small Continentals. You will not be disappointed.

Gary

[astjp2]

Re: Engine Upgrade Cost

Actually the prewar Taylorcraft uses a much different box. Tim