Today's Message Index:
----------------------
1. 07:29 AM - Re: Engines-List Digest: 7 Msgs - 05/31/03 (Jerry Reynolds)
2. 08:19 AM - Re: Franklin Versus Lycoming (Dennis O'Connor)
3. 09:47 PM - Re: Franklin Versus Lycoming (albert piccioni)
Message 1
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Engines-List Digest: 7 Msgs - 05/31/03 |
--> Engines-List message posted by: "Jerry Reynolds" <flyguy50@bluemarble.net>
> Subject: Re: Engines-List: Franklin Versus Lycoming
> At the risk of flogging a dead (or at least dull) horse, that's not true.
We
> measure torque directly and from it calculate power because it's more
> convenient. But we could just as well go the other way by, for example,
using
> the engine to raise a 550-pound weight and measuring the speed in feet per
> second to get a direct measurement of horsepower. We could then take that
> number and divide by rotational speed and the appropriate constant to get
> foot-pounds of torque.
Qualifying myself only as an observer, from behind the prop, of these
antique aviation engines, since a time when Dad submitted sketches for EAA's
original logo. And seeing that this arguement needs a degree of levity,
it's just too bad that both engines don't produce more horsepower, start
easier in cold weather, cost a lot less, be more available, or.... lawyers
forbid, have possibly evolved at any where near the same speed as sport
aviation in general and "garage built", sometimes minimal investment,
homebuilts!
And talk about flogging? Let's hope we don't have anyone tying a rope to
their prop hub, with a 550# weight at the end.. with their stop watch in
hand! Kids, don't try this at home. No offense intended, Tedd!
Jerry Reynolds
Bellaire Project, Indiana
Do not archive.
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Franklin Versus Lycoming |
--> Engines-List message posted by: "Dennis O'Connor" <doconnor@chartermi.net>
There is nothing like a long debate over the obvious...
----- Original Message -----
From: "Tedd McHenry" <tedd@vansairforce.org>
Subject: Re: Engines-List: Franklin Versus Lycoming
> --> Engines-List message posted by: Tedd McHenry <tedd@vansairforce.org>
>
> > Simply put,,,,to settle this thing in peoples minds,,,,,,we can MEASURE
> > torque to calculate H.P.
> > We cannot MEASURE H.P. to calculate TORQUE
>
> At the risk of flogging a dead (or at least dull) horse, that's not true.
We
> measure torque directly and from it calculate power because it's more
> convenient. But we could just as well go the other way by, for example,
using
> the engine to raise a 550-pound weight and measuring the speed in feet per
> second to get a direct measurement of horsepower. We could then take that
> number and divide by rotational speed and the appropriate constant to get
> foot-pounds of torque.
>
> Saying that torque is measured directly whereas power isn't tends to imply
that
> there's something vague or misleading about power, or that torque is
somehow a
> more meaningful measurement. Those assertions aren't true, either.
>
> Tedd McHenry
> Surrey, BC
>
>
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Franklin Versus Lycoming |
--> Engines-List message posted by: "albert piccioni" <adpiccioni@cnx.net>
The original meaning of h.p. is,,,,how much land can one hose till in one
hour.
Also anyone can build a direct reading torque measuring devise,,,,called a
brake,,,,with an arm exactly 12" long measured from center of shaft for
measurements in foot ponds.
alberto
----- Original Message -----
From: "Tedd McHenry" <tedd@vansairforce.org>
Subject: Re: Engines-List: Franklin Versus Lycoming
> --> Engines-List message posted by: Tedd McHenry <tedd@vansairforce.org>
>
> > Not so,,,what you say has been tried and found unsatisfactory,,,,,,the
> > system you advocate uses too many items that introduce inconsistent
> > varialbles.
>
> Alberto:
>
> Your statement was...
>
> > > > We cannot MEASURE H.P. to calculate TORQUE
>
> I wasn't proposing that measuring power directly was the best way, I was
simply
> pointing out that your statement above was not true. It quite clearly IS
> possible to measure power directly, as I described, and in fact that is
how
> horsepower was originally defined.
>
> But the entire issue is silly since, strictly speaking, we don't measure
torque
> directly, either. We measure volts, the output of the piezoelectric cell
> attached to the dynamometer. Then we calculate torque from that (in most
cases
> the dynamometer calculates it for us). Then we calculate power from that.
>
> Tedd McHenry
> Surrey, BC
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|