best glide speed of a warrior

the best glide speed of a warrior is quoted as 73 kts. but best glide should
be at best lift /drag ratio which I recall is at about 4 degree angle of
attack. But this must be a function of weight. So my questions are what
weight is the 73 kts based on ? and how much does this best speed change say
between maximum weight and minimum wight , or lets just say an 80 kg ( 176
pounds for the folks up over ) pilot flying solo with half fuel? Why ? I
am just curious, I like practicising my forced landings ( solo) and just
wondered how much extra time /distance i might get by flying at a more
"correct" speed. My flying school actually rounds it off to 75kts,
regardless of weight.
Terry

73 kts is the stall speed at max gross and aft CG.

Vs(actual)=[sqrt(actual wt/gross wt)]*Vso(gross)


d&tm wrote:
the best glide speed of a warrior is quoted as 73 kts. but best glide should
be at best lift /drag ratio which I recall is at about 4 degree angle of
attack. But this must be a function of weight. So my questions are what
weight is the 73 kts based on ? and how much does this best speed change say
between maximum weight and minimum wight , or lets just say an 80 kg ( 176
pounds for the folks up over ) pilot flying solo with half fuel? Why ? I
am just curious, I like practicising my forced landings ( solo) and just
wondered how much extra time /distance i might get by flying at a more
"correct" speed. My flying school actually rounds it off to 75kts,
regardless of weight.

73k stall speed? a Warrior? I don't think so or I'd have crashed on final
many
times.




"john smith" wrote in message
...
73 kts is the stall speed at max gross and aft CG.

Vs(actual)=[sqrt(actual wt/gross wt)]*Vso(gross)


d&tm wrote:
the best glide speed of a warrior is quoted as 73 kts. but best glide
should
be at best lift /drag ratio which I recall is at about 4 degree angle of
attack. But this must be a function of weight. So my questions are what
weight is the 73 kts based on ? and how much does this best speed change
say
between maximum weight and minimum wight , or lets just say an 80 kg (
176
pounds for the folks up over ) pilot flying solo with half fuel? Why ?
I
am just curious, I like practicising my forced landings ( solo) and just
wondered how much extra time /distance i might get by flying at a more
"correct" speed. My flying school actually rounds it off to 75kts,
regardless of weight.

john smith wrote:
73 kts is the stall speed at max gross and aft CG.

Vs(actual)=[sqrt(actual wt/gross wt)]*Vso(gross)

Vbg is the stall speed at max gross and aft CG? Where did you get that
from???

Hilton


d&tm wrote:
the best glide speed of a warrior is quoted as 73 kts. but best glide
should
be at best lift /drag ratio which I recall is at about 4 degree angle of
attack. But this must be a function of weight. So my questions are
what
weight is the 73 kts based on ? and how much does this best speed change
say
between maximum weight and minimum wight , or lets just say an 80 kg (
176
pounds for the folks up over ) pilot flying solo with half fuel? Why ?
I
am just curious, I like practicising my forced landings ( solo) and just
wondered how much extra time /distance i might get by flying at a more
"correct" speed. My flying school actually rounds it off to 75kts,
regardless of weight.

On Sun, 12 Dec 2004 22:43:48 GMT, "Hilton" wrote:

john smith wrote:
73 kts is the stall speed at max gross and aft CG.

Vs(actual)=[sqrt(actual wt/gross wt)]*Vso(gross)

Vbg is the stall speed at max gross and aft CG? Where did you get that
from???

It was either a brain fart, or a typo. :-)



Hilton


d&tm wrote:
the best glide speed of a warrior is quoted as 73 kts. but best glide
should
be at best lift /drag ratio which I recall is at about 4 degree angle of
attack. But this must be a function of weight. So my questions are
what
weight is the 73 kts based on ? and how much does this best speed change
say
between maximum weight and minimum wight , or lets just say an 80 kg (
176
pounds for the folks up over ) pilot flying solo with half fuel? Why ?
I
am just curious, I like practicising my forced landings ( solo) and just
wondered how much extra time /distance i might get by flying at a more
"correct" speed. My flying school actually rounds it off to 75kts,
regardless of weight.

Yup, brian fart.
The equation is the same, just change the Vso to Vglide and the best
speed at reduced weight will be correct.

Jay Somerset wrote:

It was either a brain fart, or a typo. :-)

According to the ASA "generic" Warrior Pilot's Guide, the Warrior II
(not the Cadet version) has the following airspeed limitations:

Vne 160 kts
Vno 126 kts
Va 111 kts at 2240 pounds
Va 88 kts at 1531 pounds
Stall 50 kts (clean)
Stall 44 kts (full flaps)

And remember, as per Kershner, stall & glide speed are dependent
on weight.

OBTW - same numbers for the Cadet (I just turned the page)

"john smith" wrote in message
...
73 kts is the stall speed at max gross and aft CG.

Vs(actual)=[sqrt(actual wt/gross wt)]*Vso(gross)


I am not talking about stall speed but it makes sense to me that the
calculation should be the same for the change in glide speed,

so if my best glide speed is 73kts at gross wt (1055 kg), then with just me
and half fuel at about 850 kg
this would give a speed of 66kts, which is a significant difference (
especially from the 75 the flying school suggests)

now that i think about it your equation makes sense. lift required should
be proportional to weight. but lift generated by the wing is proportional to
v^2. So for the same angle of attack it makes sense that the speed should
be a factor of
sqrt ( actual wt/gross wt). in the stall example you are just talking about
a different angle of attack ( 16 degrees) instead of the best glide angle of
attack (4 degrees)

thanks for the help John.

Terry

I usually have my student's fly final at 60. I would think we'd have
noticed if stall speed were 73.

BTW: There is a formula to get Vy, Vx, and Vso (and probably best
glide) for each weight. I don't have it in front of me right now. That
formula is on the Flight Engineer FAA written exam.

-Robert, CFI