Taylorcraft air speed

[McRay7ac]

this has probity been discuss before what speed
does in clear air and no wind is cruse speed of
Taylorcraft BC12D - my Taylorcraft gets 85 to 90
at 2100 rpm still having rigging problem with
pulling to right adjust strut left down and right up
each turn it gets better would like hands off in no wind and air

[Guest]

Re: Taylorcraft air speed

Has the plane been rigged according to the wing rigging drawing in the manual?

Drawing has been posted on the sit ea few time if you need to see it.

Dave R.

[McRay7ac]

Re: Taylorcraft air speed

I have drawing that shows 9 in from front spare with a 30 in level from the rear spar 15/16 in when level is
thrust line that is for checking angle of rib for correct wash of wings is there another drawing I should be looking at

[McRay7ac]

Re: Taylorcraft air speed

I have drawing that shows 9 in from front spare with a 30 in level from the rear spar 15/16 in when level is
thrust line that is for checking angle of rib for correct wash of wings is there another drawing I should be looking at

[Guest]

Re: Taylorcraft air speed

Mine doesn't have a front spare.

It sounds about right, I don't have drawing memorized.

Just asking if the plane had been rigged per that drawing?

[Guest]

Re: Taylorcraft air speed

It's 1-5/16" not 15/16"

[flyguy]

Re: Taylorcraft air speed

Adjusting the left wing down, if that is what you mean, will cause the airplane to roll/turn right. Sounds like you are adjusting it backwards if I understand what you are saying accurately.
Darryl

[McRay7ac]

Re: Taylorcraft air speed

I ment to say controls to right with right rudder left wing heavy instead of pulling to the Right it get better every
time I fly it what I wanted to fine out what is the average air speed for a BC12D

[woodmw]

Re: Taylorcraft air speed

Ray.....

I have a 7242 wood prop.
Speeds:
2000 rpm -- 83 mph
2150 rpm -- 86 mph

With 7444 metal prop:
2000 rpm -- 82 mph

Here's a link to the thread showing my data. (On second page, near bottom)

http://vb.taylorcraft.org/showthread.php?10357-What-s-needed-to-go-from-metal-to-wood-prop&p=85772#post85768

[McRay7ac]

Re: Taylorcraft air speed

thanks Mike thats what I was wondering about what speed at about 2100 Rpm the aircraft should cruse at

[Guest]

Re: Taylorcraft air speed

I use a McCauley 1B90 CM7049 and it climbs and cruises really well. Used to go 99mph at 2200 rpm with one person in the plane. I gained a couple of MPH above 99 after I replaced the struts and rigged per that drawing. Prop is special and required a field approval. Speed seems to vary with fuel quality 100LL id better than mogas.

[Mark Bowden]

Re: Taylorcraft air speed

Hi, @3500’, ~2200 rpm, I typically see indicated 89-94 mph throughout the seasons & weather. (No idea on ASI calibration) but with myself and about ½ gas power off stall is 42-44.

I have a McCauley 1A90 CF7443 on fresh engine. I’m not optimally rigged. Note, my prop has been reworked with 4” reduction in diameter.

Some things to check:
1) Power off stalls with just pilot and ½ gas. What is yours at?
2) Check your tach with an optical tach, it could likely be off some. Check it at 2150 and 2300 rpm
3) Has the airspeed indicator ever been calibrated? They are calibrated to standard temp and sea-level pressure.
4) Your static line back to the wing could be in a bad spot or if you have air moving through it, it can affect the ASI too.

A check on PERFORMANCE is to fly a triangular course. This can get you to true airspeed, it takes wind effects out of the exercise and use gps to get ground track distance. Try and pick a “steady, non-thermal” close to standard day pressure, 60-80 deg. You want to be smooth, not bouncing around.

If you are actually out of rig, fly the triangle get a baseline, then fly again when rigged to satisfaction. It should improve.

The Continental Operation manual from 1944, with revisions in ’46 & ’48 gives the following:
65 hp at 2300 rpm @ sea level
29.4” Hg max manifold pressure at 2300 rpm
2150 rpm for recommend cruise.
26.8” Hg max manifold pressure at 2150 rpm
Fuel flow at 2150 is 4.4 gph

Engine manual is going to be conservative on fuel flow; in calm air, @3500’, turning 2150-2200 I see at or just under 4 gph.
Mark

[jstall]

Re: Taylorcraft air speed

this has probity been discuss before what speed
does in clear air and no wind is cruse speed of
Taylorcraft BC12D - my Taylorcraft gets 85 to 90
at 2100 rpm still having rigging problem with
pulling to right adjust strut left down and right up
each turn it gets better would like hands off in no wind and air

TAS has no relation to clear air no wind or whatever, but the TAS relative to
power setting, temp and altitude does

Mine as far as I can tell about 90 mph to 95 IAS and about 75 to 77 kts true
at 2000 feet and 2150, airspeed indicators are all over the place, one way to null those
as you probably know is to fly into wind note ground speed/ then reverse and note GS
then add together and divide by 2, the average that will give you an approximate speed
compair to the indicated and you can work numbers backwards to get the IAS verses TAS
doing this down low your IAS and TAS should be pretty well the same

JS

[Guest]

Re: Taylorcraft air speed

Hi, @3500’, ~2200 rpm, I typically see indicated 89-94 mph throughout the seasons & weather. (No idea on ASI calibration) but with myself and about ½ gas power off stall is 42-44.

I have a McCauley 1A90 CF7443 on fresh engine. I’m not optimally rigged. Note, my prop has been reworked with 4” reduction in diameter.

Some things to check:
1) Power off stalls with just pilot and ½ gas. What is yours at?
2) Check your tach with an optical tach, it could likely be off some. Check it at 2150 and 2300 rpm
3) Has the airspeed indicator ever been calibrated? They are calibrated to standard temp and sea-level pressure.
4) Your static line back to the wing could be in a bad spot or if you have air moving through it, it can affect the ASI too.

A check on PERFORMANCE is to fly a triangular course. This can get you to true airspeed, it takes wind effects out of the exercise and use gps to get ground track distance. Try and pick a “steady, non-thermal” close to standard day pressure, 60-80 deg. You want to be smooth, not bouncing around.

If you are actually out of rig, fly the triangle get a baseline, then fly again when rigged to satisfaction. It should improve.

The Continental Operation manual from 1944, with revisions in ’46 & ’48 gives the following:
65 hp at 2300 rpm @ sea level
29.4” Hg max manifold pressure at 2300 rpm
2150 rpm for recommend cruise.
26.8” Hg max manifold pressure at 2150 rpm
Fuel flow at 2150 is 4.4 gph

Engine manual is going to be conservative on fuel flow; in calm air, @3500’, turning 2150-2200 I see at or just under 4 gph.
Mark

Hi Mark,

Can you explain the math behind the "triangle course" how does that work?

I have heard of it before but it has never made sense to me.

Very interested in the mathematical theory behind it.

Figured you were a good guy to ask with your engr. background.

Dave R

[3Dreaming]

Re: Taylorcraft air speed

TAS has no relation to clear air no wind or whatever, but the TAS relative to
power setting, temp and altitude does

Mine as far as I can tell about 90 mph to 95 IAS and about 75 to 77 kts true
at 2000 feet and 2150, airspeed indicators are all over the place, one way to null those
as you probably know is to fly into wind note ground speed/ then reverse and note GS
then add together and divide by 2, the average that will give you an approximate speed
compair to the indicated and you can work numbers backwards to get the IAS verses TAS
doing this down low your IAS and TAS should be pretty well the same

JS

A straight out and back will not provide an accurate speed if there is any wind.