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Author Topic: A new one, even for me.  (Read 888 times)

Offline Perry Rose

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A new one, even for me.
« on: August 16, 2022, 01:31:42 PM »
I replaced parts in 3 .40 LA's that I used to make 3 .46 LA's several years ago.  I was flying one of the .40's and it was not making much power. Today I flew it and the engine stopped after a few trips around the circle. At home I found that the back plate had fallen off. I guess I didn't tighten the screws much. The screws were found in the engine compartment. Try again in the morning.
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Offline Tim Wescott

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Re: A new one, even for me.
« Reply #1 on: August 16, 2022, 03:17:54 PM »
Quote from: Perry Rose on August 16, 2022, 01:31:42 PM
The screws were found in the engine compartment. Try again in the morning.

Ahhh -- so that's why we fly full fuselage planes!
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Offline RandySmith

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Re: A new one, even for me.
« Reply #2 on: August 16, 2022, 04:09:09 PM »
Quote from: Perry Rose on August 16, 2022, 01:31:42 PM
I replaced parts in 3 .40 LA's that I used to make 3 .46 LA's several years ago.  I was flying one of the .40's and it was not making much power. Today I flew it and the engine stopped after a few trips around the circle. At home I found that the back plate had fallen off. I guess I didn't tighten the screws much. The screws were found in the engine compartment. Try again in the morning.

How  did you make  46s  from LA 40 ?

Randy
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Offline Dan McEntee

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Re: A new one, even for me.
« Reply #3 on: August 16, 2022, 04:09:26 PM »
  The devil is in the details!! VD~ VD~ VD~ VD~ VD~ VD~
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Offline Dan McEntee

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Re: A new one, even for me.
« Reply #4 on: August 16, 2022, 04:20:32 PM »
Quote from: RandySmith on August 16, 2022, 04:09:09 PM
How  did you make  46s  from LA 40 ?

Randy

  If you start with .46 cases, all you need is a Brian Gardner P&L set along with one of his heads. Then all you need is the crank, back plate and rod, prop drive hub and thrust washer plus front prop washer and nut. I built up 5 or 6  LA.46's that way while that clearing house in Japan ( R/C Japan??) still had the cases real cheap. I had a box full of swap meet LA.40s that I robbed pretty much everything else that I needed. As other cheap engine cores made themselves available, even with broken cases, I picked them up to put the .40's back together to a point where all they needed is a venturi and NVA. I don't worry too much any more about metal back plates and pick up the plastic ones pretty cheap, but still keep a few metal ones on hand just in case.
  Type at you later,
   Dan McEntee
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Offline Perry Rose

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Re: A new one, even for me.
« Reply #5 on: August 17, 2022, 05:49:29 AM »
What Dan said.
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Offline Motorman

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Re: A new one, even for me.
« Reply #6 on: August 17, 2022, 06:20:00 AM »
If you start with a 46 case how are you making it from a 40? You take all the parts that cross over from the 40 and discard the case, P/L, head, seems like most of the engine.
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Offline Steve Helmick

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Re: A new one, even for me.
« Reply #7 on: August 17, 2022, 01:26:06 PM »
What Dan and MM are saying is that the .46LA case, head, piston, cylinder...and probably the wristpin are .46 specific. All the rest can be .40LA or probably even T.40, .35FP or .40FP parts.

Can anybody confirm my suspicion that the .46 wristpin in longer than the one for a .40LA? If the P/N is different, that is enough evidence to suit me. I'm sure that none of this is a surprise to Randy Aero.  H^^ Steve
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Offline Perry Rose

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Re: A new one, even for me.
« Reply #8 on: August 18, 2022, 05:57:30 AM »
The parts list says the .40 pin is #23356000 and the .46 is #45806000. That could mean the pins are a different length or the same length with different size nylon pads. All I can take from this is they won't interchange.
  On a brighter note my engine runs a lot better with the back plate secured in place.
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I may be wrong but I doubt it.
I wouldn't take her to a dog fight even if she had a chance to win.
The worst part of growing old is remembering when you were young.

Offline Perry Rose

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Re: A new one, even for me.
« Reply #9 on: August 18, 2022, 08:33:36 AM »
I went to measure the pin lengths but the stock p & c doesn't come with the pins.
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I may be wrong but I doubt it.
I wouldn't take her to a dog fight even if she had a chance to win.
The worst part of growing old is remembering when you were young.

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