Victoria power output

[john carruthersParticipant @johncarruthers46255]

Sorry if this has been asked before but what sort of power output would a Stuart Victoria (single) engine produce and at what pressue?

[john carruthersParticipant @johncarruthers46255]

[roy entwistleParticipant @royentwistle24699]

If I remember 2x pressure x length of stroke x area of piston x rpm / 33000 = horse power

Thats from nearly 70 years ago

Roy

[Ian S CParticipant @iansc]

John, you can work out the indicated HP using the formula P.L.A.N/33,000(see Roy's entry), and when you have built the engine you can measure the brake HP by measuring the torque in(for this size engine) inch oz, and RPM/ 1352 to give the power in Watts, or gram x cm x RPM x .00001026.

I only had to remember back 53 yrs, it's about the only formula I remember from my mechanics class. Still got my copy of "Engineering Science" Vol 1, by Brown & Bryant, mines a 1957 edition, but it dates back to a first ed 1937, and I don't think it was updated, still I don't suppose physics changes.

Ian S C

[JasonBModerator @jasonb]

Am I using the right figures as I get quite a high HP using Ians formula, My thoughts last night were about 0.15 to 0.2 actual HP using 100psi and 750rpm.

 

With the formula using 100psi, 2" travel, 0.78sq in, 750rpm

100x2x0.78×750 /33000

117000 / 33000

3.54HP

Seems there is a decimal one place out

Roy's with the extra 2x would give 7hp

Edited By JasonB on 02/07/2015 14:34:12

[roy entwistleParticipant @royentwistle24699]

The 2x is because its double acting

Roy

[JasonBModerator @jasonb]

Thanks Roy, I had a feeling that may be the reason though sitll seems to be a high result?

[JasonBModerator @jasonb]

ME Handbook to the rescue

L should be in feet not inches

So 2x100x0.167×0.78×750/33000

19539/33000

0.6HP

Though whether the relatively long stroke of the victoria compared with its bore would suit such high revs is debatable, and pressure could be a bit high so lets say

2x 75psi x0.167x 325/33000 = 0.25HP

Edited By JasonB on 02/07/2015 15:36:56

[Nick_GParticipant @nick_g]

.

Slightly related and perhaps off topic a tad. (depending upon the OP's reason for asking)

What sort of steam engine HP would be required to run this 30 amp alternator.? **LINK**

Nick

[john carruthersParticipant @johncarruthers46255]

Thank you gentlemen, I found PLAN but not the constant and was wondering why the HP value was so high.

The little Flexispeed could run on a nominal 1/4 HP electric motor but I'd like to see it run on steam.
Also I'd like to build an engine that can do useful work so I'm looking around.

[JasonBModerator @jasonb]

Nick basic calculation is W = V x A so 420w or .56HP you would need to allow for losses etc.

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