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richard.goode(at)russiana
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 Posted: Tue Jul 21, 2009 12:26 am Post subject: M14P and IO540 |
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An interesting aspect of Kevin's thrust figures is not the amount of thrust from the M14 family of engines,but how little thrust from the Lycoming.
With 11:1 compression,I suppose it must be at least a nominal 320 HP,but even if only a nominal 300,it's thrust should be 1387 lb,if mathematicly compared to the 400HP "PF" engine rather than the actual figure of 1245!!
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
[quote][b]
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kjkimball(at)aol.com
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| Posted: Tue Jul 21, 2009 3:19 am Post subject: M14P and IO540 |
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Richard,
The additional 80 cubic inches of displacement, gear box and of course, super charger all help create the additional thrust in the M14. FYI, the 11:1 Lycon was fitted with the MTV9 203-20D 3 blade prop. We also tested a stock 260hp IO 540 lycoming as in an S2B or S2C and found a 2 blade thrust of 880lb and a 3 blade thrust of 960lb. So, 1245 is a large increase within the 540 parallel valve lycoming engine.
To compare (same scales used):
200lb pilot/chute
90lb 15 gal fuel
70lb 10 gal smoke
Single seat S2S with the 11:1 lycon parallel 540, MT 80" empty weight 1219 lb, thrust 1245 lb take off weight 1579lb thrust to weight: 0.78:1
Ti-12 and Beast (single seat model 12) BPE M14P, 102" MT, empty weight 1417 lb, thrust 1845 lb take off weight 1777lb, thrust to weight 1.03:1
This data shows a lightweight, single seat model 12 with the BPE engine or PF engine exceeds 1:1 thrust to weight during the entire show flight. An airplane powered by the example flat engine would need to be sub 848lb empty weight to achieve the same thrust to weight ratio.
I suppose my point is that it is difficult to match the thrust of the M14 series of engines for aerobatic airplanes.
Sincerely,
Kevin Kimball, Vice President
Jim Kimball Enterprises, Inc.
PO Box 849
5354 Cemetery Road
Zellwood, FL 32798-0829
407.889.3451 phone
407.889.7168 fax
www.pittsmodel12.com
www.jimkimballenterprises.com
Email: Kevin(at)jimkimballenterprises.com (Kevin(at)jimkimballenterprises.com)
On Jul 21, 2009, at 4:14 AM, Richard Goode wrote:
| Quote: | An interesting aspect of Kevin's thrust figures is not the amount of thrust from the M14 family of engines,but how little thrust from the Lycoming.
With 11:1 compression,I suppose it must be at least a nominal 320 HP,but even if only a nominal 300,it's thrust should be 1387 lb,if mathematicly compared to the 400HP "PF" engine rather than the actual figure of 1245!!
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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richard.goode(at)russiana
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| Posted: Tue Jul 21, 2009 4:54 am Post subject: M14P and IO540 |
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Yes,interesting.The thrust figures support my long-held view that Lycoming horses are somewhat arthritic,and that the Russian figures are pretty conservative!!
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
[quote] ---
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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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| Posted: Tue Jul 21, 2009 6:22 am Post subject: M14P and IO540 |
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Yes,interesting.The thrust figures = support=20 my long-held view that Lycoming horses are somewhat arthritic,and that = the=20 Russian figures are pretty conservative!!
Richard
Richard Goode Aerobatics
Rhodds = Farm
Lyonshall
Hereford
HR5=20 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544=20 340129
www.russianaeros.com
---
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