Stupid hp to thrust question

people sure like to over think things. The same prop can be put on any
engine of any horse power and if it is turned 2300 rpm then the thrust is
the same.

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"Gilan" wrote ...
people sure like to over think things. The same prop can be put on any
engine of any horse power and if it is turned 2300 rpm then the thrust is
the same.

Not necessarily. If one of the engines has a larger frontal area then part
of the flow will be blocked and that engine/prop will produce less thrust.
The extreme example is the engine that's larger than the prop diameter.

Rich

there you go thinking again.
you just added something into the question that wasn't there
Just stick to the original question and the answer is still the same.

--
Have a good day and stay out of the trees!
See ya on Sport Aircraft group
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He got a point!

"Gilan" wrote in message
nk.net...
there you go thinking again.
you just added something into the question that wasn't there
Just stick to the original question and the answer is still the same.

--
Have a good day and stay out of the trees!
See ya on Sport Aircraft group
http://groups.yahoo.com/group/Sport_Aircraft/

In article , Mark says...

Does a prop turning at 2300 rpm on a 150hp motor produce more thrust than a
prop spinning 2300 rpm on a 100 hp motor ?

If it's the same prop and it turns 2300 on a 150 hp engine the 100hp engine
won't have the power to turn it 2300. If it turns 2300 on the 100 hp engine then
the 150 hp engine will over rev it and run away the prop. At 2300 rpm the prop
will produce the same thrust regardless of engine but the 150 hp engine would
really like a bigger prop to use the remaining 50 hp.

see ya Chuck (ain't no free ride in airplanes) S

In article , ChuckSlusarczyk
writes:


Does a prop turning at 2300 rpm on a 150hp motor produce more thrust than a
prop spinning 2300 rpm on a 100 hp motor ?

If it's the same prop and it turns 2300 on a 150 hp engine the 100hp engine
won't have the power to turn it 2300. If it turns 2300 on the 100 hp engine
then
the 150 hp engine will over rev it and run away the prop. At 2300 rpm the
prop
will produce the same thrust regardless of engine but the 150 hp engine would
really like a bigger prop to use the remaining 50 hp.

see ya Chuck (ain't no free ride in airplanes) S



Ah Hell Chuck, you missed the point of the question here. The thrust produced
will remain the same in both instances regardless of the engine horsepower. If
indeed the 100hp engine is turning the prop at 2300 rpm and requires the full
100 hp to do so, the 150 hp engine is not producing full power to turn the
prop. A 1000 hp engine turning the same prop at the same rpm will still
produce the exact same thrust.


Bob Reed
www.kisbuild.r-a-reed-assoc.com (KIS Builders Site)
KIS Cruiser in progress...Slow but steady progress....

"Ladies and Gentlemen, take my advice,
pull down your pants and Slide on the Ice!"
(M.A.S.H. Sidney Freedman)

"RobertR237" wrote

Ah Hell Chuck, you missed the point of the question here.

Bob Reed

I don't think the OP was asking a trick question. While you and I
understand the relation between thrust and HP, I do not think the OP has a
grasp on it. What was not said, was, "if I use the correct prop to get 2300
RPM at full power, will the 100 HP and 150 HP engine have the same thrust?"

On the other hand, I could be reading too much between the lines, and could
be completely wrong. If so, "never mind" :-)
--
Jim in NC

In article , "Morgans"
writes:


Ah Hell Chuck, you missed the point of the question here.

Bob Reed

I don't think the OP was asking a trick question. While you and I
understand the relation between thrust and HP, I do not think the OP has a
grasp on it. What was not said, was, "if I use the correct prop to get 2300
RPM at full power, will the 100 HP and 150 HP engine have the same thrust?"

On the other hand, I could be reading too much between the lines, and could
be completely wrong. If so, "never mind" :-)
--
Jim in NC




Now that is an entirely different question and the answer is likewise entirely
different. I was not reading anything extra into the original question (for a
change) and the answer would be no difference.




Bob Reed
www.kisbuild.r-a-reed-assoc.com (KIS Builders Site)
KIS Cruiser in progress...Slow but steady progress....

"Ladies and Gentlemen, take my advice,
pull down your pants and Slide on the Ice!"
(M.A.S.H. Sidney Freedman)

In article , RobertR237 says...

Ah Hell Chuck, you missed the point of the question here. The thrust produced
will remain the same in both instances regardless of the engine horsepower. If
indeed the 100hp engine is turning the prop at 2300 rpm and requires the full
100 hp to do so, the 150 hp engine is not producing full power to turn the
prop. A 1000 hp engine turning the same prop at the same rpm will still
produce the exact same thrust.

Ah hell Bob,I guess I don't see what point I missed :-) Seems we're both saying
the same thing. Given it's the same prop on both engines and the prop is turning
2300 rpm it will always produce the same thrust at that rpm regardless .However
if you start to open the throttle the 1000 hp engine it will turn faster and
produce more thrust because it has the power to do so...But the prop will be
spinning faster than 2300 . Maybe I'm not understanding the question.

See ya

Chuck (time for Beany) S

In article , ChuckSlusarczyk
writes:


Ah hell Bob,I guess I don't see what point I missed :-) Seems we're both
saying
the same thing. Given it's the same prop on both engines and the prop is
turning
2300 rpm it will always produce the same thrust at that rpm regardless
.However
if you start to open the throttle the 1000 hp engine it will turn faster and
produce more thrust because it has the power to do so...But the prop will be
spinning faster than 2300 . Maybe I'm not understanding the question.

See ya

Chuck (time for Beany) S


Depends on rather you answer the question as written or read more into it.
Answering the question directly as written the answer is both would produce
exactly the same thrust. If the question however asked which was capable of
producing more thrust, the answer changes.

Bob Reed
www.kisbuild.r-a-reed-assoc.com (KIS Builders Site)
KIS Cruiser in progress...Slow but steady progress....

"Ladies and Gentlemen, take my advice,
pull down your pants and Slide on the Ice!"
(M.A.S.H. Sidney Freedman)