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  #21  
Old 03-15-2021, 06:54 AM
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GalinHdz GalinHdz is offline
 
Join Date: Mar 2010
Location: KSGJ / TJBQ
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Quote:
Originally Posted by flyboykelly View Post
If you pay for it, I'll do it . BTW I remember your talk at our EAA chapter. It was great meeting with you and hope to again some day.
It's a deal. Meet up that is, not the paying for a propeller part. Fly that beautiful piece of art up here to St. Augustine (KSGJ) and lunch/dinner is on me.
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  #22  
Old 03-15-2021, 08:42 AM
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flyboykelly flyboykelly is offline
 
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Location: Port Orange, FL (7FL6)
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Quote:
Originally Posted by emsvitil View Post
Is the 158 HP @ 2400 a continuous rating?

Can you go to a higher rpm for more HP? Maybe a 5 minute rating......
I'm not going to mess with the manufactures ratings or limits. the 158@2400 rating is for take off power and is limited to 5 mins. 138hp is the continuous power output. Keep in mind that radial engines make a lot of torque at low RPMs
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  #23  
Old 03-15-2021, 09:43 AM
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DanH DanH is offline
 
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Quote:
Originally Posted by flyboykelly View Post
... the 158@2400 rating is for take off power and is limited to 5 mins. 138hp is the continuous power output. Keep in mind that radial engines make a lot of torque at low RPMs
Torque is a force. Power is the rate at which work is done.

Horsepower is torque x RPM divided by a constant (5252). More torque at less RPM is the same as less torque at more RPM. For example...

9S radial (346 lbs-ft x 2400)/5252 = 158 HP
O-320 (307 lbs-ft x 2700)/5252 = 158 HP

Either way, torque is just one component of a force-distance-time definition for power. Power makes airplanes go, in particular go up.
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  #24  
Old 03-16-2021, 07:52 AM
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Snowflake Snowflake is offline
 
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Location: Sidney, BC, Canada
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Quote:
Originally Posted by DanH View Post
Torque is a force. Power is the rate at which work is done.
I was told once that power tells you how fast you'll hit the wall. Torque tells you how far you'll move it.
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  #25  
Old 03-16-2021, 09:47 AM
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Originally Posted by Snowflake View Post
Torque tells you how far you'll move it.
Technically, no. Again, torque is only a force. Force x distance ("how far you'll move it") = work. Common terms would be Joules or ft-lbsf.

Let's not get too far afield here. Subject is a lovely radial RV-8. I was merely noting more torque at lower RPM is not in itself significant. Potentially, in some applications the lower RPM could allow a larger prop disk at the same tip speed (72"@2700 is the same as 81"@2400), and some advantage might be found. However, that route is limited by the RV-8's leg length.
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Last edited by DanH : 03-16-2021 at 10:35 AM.
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  #26  
Old 03-16-2021, 09:55 AM
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Roadjunkie1 Roadjunkie1 is offline
 
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Location: Erie, Colorado
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Default Round engine RV-8

Attachment 9300[/quote]

Um.....could all those people in front of a (probably) really cool-looking airplane step just a little to the left (or right) so we can see the airplane.....? Asking for a friend...............

Is there a photograph somewhere that could posted that doesn't involve Facebook? Asking for another friend...........
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  #27  
Old 03-16-2021, 10:09 AM
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What diameter of prop will you be swinging with the new engine?
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  #28  
Old 03-16-2021, 11:12 AM
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airguy airguy is offline
 
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Quote:
Originally Posted by azrv6 View Post
What diameter of prop will you be swinging with the new engine?
Depends on how much torque he can get.


Sorry, sorry.... couldn't resist.. running and hiding now.
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Garden City, TX VAF 2021 dues paid
N16GN flying 750 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #29  
Old 03-16-2021, 11:15 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
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Quote:
Originally Posted by airguy View Post
Depends on how much torque he can get.


Sorry, sorry.... couldn't resist.. running and hiding now.
How can have any pudding if you dont eat your meat?
I am still waiting
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WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2021, worth every penny

RV9A- Status:
Tail 98% done
Wings 98% done
Fuselage Kit 98% done
Finishing Kit 35% canopy done for now
Electrical 85% in work
Firewall Forward 5% in work
Fiberglass 0%, thought i was building in metal?
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  #30  
Old 03-16-2021, 12:29 PM
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DanH DanH is offline
 
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Quote:
Originally Posted by Roadjunkie1 View Post
Is there a photograph somewhere that could posted that doesn't involve Facebook?
Photo from EAA Sport Aviation, October 2016.
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