Tweet
Hello everyone. I haven't been on here for quite some time(since I bought my 2nd T-craft). I have a 46 BC12D with an A75. It had a 71X44 prop when I bought it and it would static 2500 easily. I got another prop that is a 70X48 and it statics @ 2300 but still won't get out loaded like my 1st T-craft with the A65. I would love to hear what everyone is running on their T-crafts as I'm still not able to outrun my IA's C75 powered Champ.
-
-
Re: BC12-D prop question
There are several threads with lots of comments and info on different props here. Do some searches.
DC -
Re: BC12-D prop question
I am not sure if it is type certified for a 65 hp or 75 hp, but I just put an new senseninch 76-2-40 on my 85 hp, and it turned it into a rocket, both out of the water, and on cruise speed. Have to do some homework though on yours.Comment
-
Re: BC12-D prop question
General rule of thumb...the longer the prop, the better the climb. You should look at 74" or a 75" cessna McCauley 1A90 seaplane prop, you will need it to be pitched for correct static..... They are even approved for your Tcraft.N29787
'41 BC12-65Comment
-
Re: BC12-D prop question
Do you mean Sensenich? The longest 1A90 allowed by Cessna on the C85 or McCauley on the A75 or C85 is 71"...Originally posted by astjp2 View PostComment
-
Re: BC12-D prop question
my tcraft has a MCcauley 74-42 great climb prop.Comment
-
Re: BC12-D prop question
so....on a BC12D...65 horsepower what would be the ideal prop for decent climb out and cruise? JCComment
-
Re: BC12-D prop question
III - Model 150G, Model 150H, Model 150J, Model 150K (cont’d)Originally posted by NY86 View Post
2. McCauley 1A100/MCM 21 lb. (-32)
Diameter: not over 69 in., not under 67.5 in.
Static r.p.m. at maximum permissible throttle setting:
not over 2475, not under 2375
No additional tolerance permitted
3. McCauley 1A90/CF (seaplane only) 24 lb. (-32)
Diameter: not over 75 in., not under 73.5 in.
Static r.p.m. at maximum permissible throttle setting:
not over 2600, not under 2500
see the type cert. for the prop, you can run from 78" to 70" @2600 on a 85 hp engine.
Or if you look at item 5 of the Taylorcraft F-19 allows for a 74-43 with the O-200 and this would be justification for a FIELD APPROVAL to use the 1A90CF on the 85 hp engine. TimN29787
'41 BC12-65Comment
-
Re: BC12-D prop question
Sen. M74ck-0-43, the 46 is standard but the reduction in pitch will increase climb without sacraficing much in cruise. TimOriginally posted by jim cooper View PostN29787
'41 BC12-65Comment
-
Re: BC12-D prop question
We're not talking about an O200.Diameter: not over 75 in., not under 73.5 in.
but not any 85 hp engine. and specifically, not a C85.see the type cert. for the prop, you can run from 78" to 70" @2600 on a 85 hp engine
Read note 9 of the prop TCDS.
I'm all for field approvals, but there are times when they should not be granted. When McCauley refers to vibration they aren't talking about a minor annoyance, they're talking about something that can cause the crank or prop to fail.Comment
-
Re: BC12-D prop question
Recall the debate a few months ago about whether or not to use the wood prop's front plate with a metal prop?
See note 1b in P842, the answer is in there;
NOTE 1. Installation. The model 1A90/CH propeller is to be assembled only with the Continental Motors tapered
crankshaft hub detail No. 3745. The propeller nut and snap ring, Continental Part Numbers 21202 and
21203 are also used. The model 1A90/CF and 1B90/CM propellers are equally adaptable to the Continental
tapered crankshaft (CMC 3745 hub) or the flanged crankshaft (SAE No. 1) using bushings A-1170 as
required. The model 1C90/LF and 1C90/LM propellers are eligible only with McCauley adapter C-1210
which permits installation on an SAE No. 2 flange.
Bolts, nuts and front plates furnished by the engine manufacturer are not to be used. The propeller
manufacturer will furnish the necessary bolts, bushings and adapters or spacers as needed for the desired
installation. See NOTE 2 for installation drawing requirements.
It doesn't make any sense to me but it needs to be complied with.
My field approval falls within their rules in NOTE 9; on a
Continental A-65 diameter between 76" to 69 ½" for an 1B90/CM propComment
-
Re: BC12-D prop question
I run a 74x38 on a 65hp, I think it's a sensi. Works awesome for t.o, I cruise at about 85mph. My t.o.s are usually under 250' when light.Last edited by akndrifter; 03-25-2010, 13:46.Catch the fish, to make the money, to buy the bread, to gather the strength, to catch the fish...Comment
-
Re: BC12-D prop question
I'm flying off of a 1700ft grass strip so I need it to climb pretty well but without sacrificing cruise too much. My first T would take 2 200+ people out on a warm day and still criuse just above 100 on an A65. This one has the A75 so I would like to get at least close to what I had before. Still trying to locate 43781 to find out what prop it had.Comment
-
Re: BC12-D prop question
Ok, here's a little summary. I have owned 3 BC12's. Two 65's and my present 85.
1. Forget the 100 mph cruise unless you run 100% power. Tcraft airspeed indicators are notorious for being all over the board. Likely due to the stock location of the "static" port in the wing, where it really isn't very static. Cut the one you have now some slack and take anything over 90 as good.
2. Ok, enough of that. Props: Since you can run a 74, and since they are LONGER, they will give you more thrust and are the best legal/safe choice.
3. On a land BC12-65 the 46 pitch is a good all around choice. I have run one on 2 different -65's and both worked well for cruise and climb.
4. Maybe some airplane guys can loan you a 7443 to try, which, according to a response above, works well on a 65. I also suspect that is so.
That is my best shot on land 65 props.
Good Luck,
Darryl
BIG OOPS here. Sorry, C.J., I missed the 75 HP part. Thought you were talking about a -65.
I will leave this here, but I am talking about a -65 only for you guys who might profit from this info.Last edited by flyguy; 03-02-2010, 19:07.Comment
Comment