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saurian
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« on: December 12, 2009, 07:29:59 PM » |
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hi guys, One of my friends builds airplanes and is interested in the valk engine as a power plant. What we need to know is the weight of the engine and carb set up. Can anyone shed some light? Thanks in advance.
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X Ring
Member
Posts: 3626
VRCC #27389, VRCCDS #204
The Landmass Between Mobile And New Orleans
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« Reply #1 on: December 12, 2009, 08:28:01 PM » |
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i don't know if anyone here can answer your question but Pinwall might. They sell used Valk parts and I'm pretty sure they've sold an engine or two.
Marty
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People are more passionately opposed to wearing fur than leather because it's safer to harass rich women than bikers.  |
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saurian
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« Reply #2 on: December 13, 2009, 04:26:45 AM » |
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thanks Marty, I knew someone would have a better idea than I. But I did know that the board was the place to garner that idea.
Monty
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Jeff K
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« Reply #3 on: December 13, 2009, 05:34:22 AM » |
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I don't know a lot about airplane motors but the great majority of the Valk motor's weight is the transmission. Why would you use any motor with an integral transmission?
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Ricky-D
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« Reply #4 on: December 13, 2009, 09:41:16 AM » |
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Some guy on E-Bay a while back, selling a motor, said to use 350 pounds to calculate shipping.
I think a motor designed for an airplane has much better weight to horsepower ratio. They're air cooled besides.
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2000_Valkyrie_Interstate
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9Ball
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« Reply #5 on: December 13, 2009, 09:54:46 AM » |
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let's give you the proper answer...
49 state/Canada type...118.7 kg (262 lbs)
California type.............119.0 kg (262 lbs)
The service manual is a great resource.......
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VRCC #6897, Joined May, 2000
1999 Standard
2007 Rocket 3
2005 VTX 1300S
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GJS
Member
Posts: 424
Today is the tomorrow you worried about yesterday.
Vancouver Island, BC, Canada
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« Reply #6 on: December 13, 2009, 10:09:01 AM » |
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Hi there,
Unless you go to a set of fuel injectors to replace the carbs, I think this could be a very poor choice.
Small planes that use carborated engines suffer from carb icing. The Dew Point is where moisture can/will turn to ice. A normal small plane has Carb Heat as a control. The pilot has an option to direct exhaust heat and air back towards the carb. This causes a drop in RPM, but melts the ice. Once above the Dew Point altitude, the problem disappears. So, if you are to use an engine with six carbs, you will need to develop a Carb Heat system as well.
My gut instinct tells me a Valk engine may not be a good choice. Rotax makes good small aircraft engines. Lycomming and Continental makes the more traditional engines.
Best Regards,
Glenn Schentag
Private Pilot w/Night Rating
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The tragedy of life is not that it ends so soon, but that we wait so long to begin it.
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saurian
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« Reply #7 on: December 13, 2009, 01:21:09 PM » |
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Thanks to all you guys. The answers and comments are welcome and we appreciate them. The weight to power ratio is why we were interested in the first place. Again, thanks for the interest. Will let you know if he does decide to try our favorite engine.
Monty
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RP#62
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« Reply #8 on: December 13, 2009, 04:34:52 PM » |
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An O-200 Continental puts out the same power at around 180 pounds.
-RP
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GJS
Member
Posts: 424
Today is the tomorrow you worried about yesterday.
Vancouver Island, BC, Canada
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« Reply #9 on: December 13, 2009, 05:03:45 PM » |
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Yer right about the O-200. But I bet a new one is $35K and old and used $12K.
No?
I'm not sure, but I can see the attraction.
Honda engine for 1, Cheap Cheap for 2 (by comparison to standard aviation engines)
Cheers,
Glenn
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The tragedy of life is not that it ends so soon, but that we wait so long to begin it.
- W. M. Lewis
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RP#62
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« Reply #10 on: December 13, 2009, 05:24:20 PM » |
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Thats true, and definitely one of the considerations, but in aviation, the other considerations are reliability, redundancy and efficiency. In the case of the valk motor you've got, single ignition dependant on an external electrical source, the added weight of liquid cooling, the added weight of the transmission, the added weight of an additional gearbox to drive the prop as the output shaft bearings wouldn't be designed to handle direct drive prop loads, carburetors without a mixture control, etc. Not saying it can't be done and the cost of the valk motor is definitely attractive, just other things to consider.
-RP
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