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CY MODELS La-7//Evolution 160 radial

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CY MODELS La-7//Evolution 160 radial

Old 12-16-2017, 02:54 PM
  #426  
n8622t
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The Evo160 is back. I spoke with the mechanic and they replaced the entire cam block with a brand new one then tested the engine to ensure the problem wasn’t duplicated. I should have it mounted some time tomorrow I feel confident that the engine is repaired and look forward to flying the Model again ��
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Old 12-16-2017, 05:45 PM
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Good news!!
Old 12-17-2017, 08:00 AM
  #428  
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got information on the Evo160 pushrods from UMS.....changed from aluminum to stainless steel to eliminate the mushroom problem HH doesnt know anything about them, go figure
Old 12-20-2017, 07:02 AM
  #429  
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Almost ready for flight #2 😃
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Old 04-25-2018, 06:12 AM
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Originally Posted by n8622t
Almost ready for flight #2 😃
just to touch base with any La-7 fans....mine is still alive and flying great. The Evo160 went through some issues but it’s running as it should now. Great flying Model 😃
Old 04-26-2018, 08:06 AM
  #431  
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Good to see some more LA-7's out there. Mine's a brute with a DLE-120 in the nose.


Old 04-26-2018, 09:37 AM
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Great photo!! Maybe I can get a pic of mine in the air. Going to Joe Nall so maybe I can get a good flying pic there
Old 04-26-2018, 09:43 AM
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Hey Todd what’s size tires are you using ?
Old 05-02-2018, 06:28 AM
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Those are 5.25" wheels I got from a friend. Not sure what brand they are.
Old 05-02-2018, 03:11 PM
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Originally Posted by Hot Rod Todd
Those are 5.25" wheels I got from a friend. Not sure what brand they are.
Thanks Todd. I’ve been running 5” wheels but haven’t landed on grass yet so I’m considering 5 1/2” wheels....I’ll consider it a little more
Old 05-02-2018, 03:13 PM
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These are the 5 1/2” FW wheels I’m considering
Originally Posted by Hot Rod Todd
Those are 5.25" wheels I got from a friend. Not sure what brand they are.
Thanks Todd. I’ve been running 5” wheels but haven’t landed on grass yet so I’m considering 5 1/2” wheels....I’ll consider it a little more
Old 05-20-2018, 07:44 PM
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My first flight video....tenth flight ��
Old 05-21-2018, 06:31 AM
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Jimmy,
Congrats!
The plane looks great and the engine sounds wonderful, nicely done!
Question, Do you have to access the primer bulb on the engine when you start it or no?
Old 05-21-2018, 03:37 PM
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Yes I do BobH....I built removable hatches on the cowl, one for needles and one for the carb bulb. The landing was a little on the rough side and it’s because the plane is nose heavy so I’m gonna rebalance it tomorrow and that will fix the landings. I’ll try to get another video this upcoming weekend. Going to a big warbird fly in in Monroe, Louisiana
thanks for the nice comments
Old 05-21-2018, 03:43 PM
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By the way, that entire flight including the manuvures was done at 1/2 throttle ��
Old 05-21-2018, 06:21 PM
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Jimmy,
Thank you for the reply. At half throttle the engine sounds wonderful!! Truly a winner!
Old 05-22-2018, 05:45 AM
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Thanks BobH...I’m thinkin about getting a second CY La-7 ....this model is a really easy flyer!!
Old 05-22-2018, 09:45 AM
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Jimmy,
I guess you must "prime" the engine via the primer bulb.
Have you ever considered the electric fuel pump from Vogelsang Aeroscale? He claims that it fixes all the issues with fuel delivery to the radial engines.
http://vogelsang-aeroscale.com/
look under Moki accessories for the fuel pump.

APS Fuel Pump PowerFuel RX

$245.00

Old 05-22-2018, 09:58 AM
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The carb primer bulb is really no trouble to access and it works great. The engine is also solid in fuel deliver from the tank so, unless a guy just feels the need for a pump, the engine is fine without it. If the tank were 18” or more away from the carb then a pump could be necessary but my set up is good enough that the fuel flow is fine for all my vertical manuvures
Old 05-22-2018, 09:59 AM
  #445  
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BTY the prime is only needed for the first flight of the day....fuel stays at the carb from there on
Old 05-22-2018, 11:46 AM
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Jimmy,
I asked about the fuel bulb because when I pumped mine fuel leaked from around the base of it. I don't know why. I replaced the bulb thinking it had a hole in it but it didn't.
Does yours leak fuel when you push it?
Just wondering here.
Thanks buddy.
Old 05-22-2018, 07:32 PM
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Originally Posted by BobH
Jimmy,
I asked about the fuel bulb because when I pumped mine fuel leaked from around the base of it. I don't know why. I replaced the bulb thinking it had a hole in it but it didn't.
Does yours leak fuel when you push it?
Just wondering here.
Thanks buddy.
BobH that’s normal, your bulb is fine. If you look closely you will see there is a nipple that looks like a fuel line should be on it and that’s where the fuel flows from. It’s a one way outlet to prevent pressure from building too high once the fuel has reached the.bulb. The fuel simply pumps out of the nipple once the bulb is full. Hope this helps
Old 05-23-2018, 04:19 AM
  #448  
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Jimmy,
Thank you. I've never seen that arrangement before. Now I know, great!
thanks buddy.
Old 05-23-2018, 04:31 AM
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No problem I’m glad I could help
Old 05-23-2018, 04:54 AM
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Ok here’s the rub ....my first flight was down right perfect from take off to landing. This model is as stable as they get and really easy to land and being the first flight, the plane was set up and balanced as it should be. I landed on asphalt and the plane set down on a three point landing at a walk speed. I was thrilled! The second flight didn’t go so well. I tried landing in the grass off to the side of the asphalt. I set the plane on its mains in a wheel landing and the plane flipped immediately when the wheels touched down. Broke the cowl and tore up the Robart’s.
Fortunately, nothing else was damaged, not even the prop. But, I realized that I placed my gear to close to the CG, even though I had moved them 1/2” further forward of the original location. I called Darrell at Sierra and he happened to have some gear that would fit perfect and wouldn’t fail like the Robart’s had. I shimmed the gear in order to move the axles forward and that fixed the grass landings. With all the repairs on the nose plus the addition of the baffeling added to the cowl, I ended up nose heavy and it’s made landings difficult....I’ve actually bent three axles now but Ive just finished rebalancing so I expect smooth landings like the first one.
I’ll let you know how it goes this weekend in Monroe, Louisiana

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