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Author Topic: Stalker 76 Hot Re-start No bueno  (Read 1538 times)

Offline Mike Callas

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Stalker 76 Hot Re-start No bueno
« on: August 20, 2017, 09:48:04 PM »
Re-starting my Stalker 76 is difficult to impossible until it cools completely, usually around 15 to 20 minutes. It starts fine if I use water to cool the motor 10 minutes after shut down.
Is this inherent to this design, or a sign the compression is too low?
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Offline Brett Buck

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Re: Stalker 76 Hot Re-start No bueno
« Reply #1 on: August 20, 2017, 09:50:13 PM »
Quote from: Mike Callas on August 20, 2017, 09:48:04 PM
Re-starting my Stalker 76 is difficult to impossible until it cools completely, usually around 15 to 20 minutes. It starts fine if I use water to cool the motor 10 minutes after shut down.
Is this inherent to this design, or a sign the compression is too low?

    I don't have one, but I would be surprised if that was impossible. When it is hot, what do you do and how much do you choke it?

    Brett
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Offline Air Ministry .

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Re: Stalker 76 Hot Re-start No bueno
« Reply #2 on: August 20, 2017, 10:13:57 PM »
see the stalker site says 3/4 Castor .

Is it fully cowled . Is the outlet 2x inlet + .
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Online Lauri Malila

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Re: Stalker 76 Hot Re-start No bueno
« Reply #3 on: August 20, 2017, 11:57:02 PM »
Have you used it a lot? One reason is carbon residue on piston sides/cylinder wall. Maybe time to clean? L
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Offline Mike Callas

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Re: Stalker 76 Hot Re-start No bueno
« Reply #4 on: August 21, 2017, 01:52:51 PM »
It is almost fully enclosed. I choke it like normal, nothing. I choke it more, nothing. I flood it and drain the fuel by removing the plug, nothing. I cool it off with water and it starts up.
I use ~ 2% castor. I have run 3 gallons thru it and it runs better and better, except for this one minor issue.

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Offline Reptoid

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Re: Stalker 76 Hot Re-start No bueno
« Reply #5 on: August 21, 2017, 04:09:34 PM »
Quote from: Mike Callas on August 21, 2017, 01:52:51 PM
It is almost fully enclosed. I choke it like normal, nothing. I choke it more, nothing. I flood it and drain the fuel by removing the plug, nothing. I cool it off with water and it starts up.
I use ~ 2% castor. I have run 3 gallons thru it and it runs better and better, except for this one minor issue.
Normally, a warm/hot engine will not want a prime at all. Just fuel it up, flip over a few times without battery, then attach battery and start it. Muffled engines when hot tend to get fumes (burned exhaust) in the muffler which is drawn back in when flipping it over. Whatever amount of fuel (choke or prime) you give it when cold, it will want a lot less or none when warm/hot.
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Offline Peter Nevai

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Re: Stalker 76 Hot Re-start No bueno
« Reply #6 on: August 21, 2017, 06:31:18 PM »
Ultimately, whats the rush? I have had OS 40FSR's that would not like to do an immediate restart, and some of those were in a profile with the engine hanging out in the breeze. Giving it a rest actually improved my flying as it is beneficial to unwind after a flight. Unless of course you are just knocking about for fun. Besides it gives a chance for others to get their flights in and time to knock back a beer and gossip.
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Offline Brett Buck

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Re: Stalker 76 Hot Re-start No bueno
« Reply #7 on: August 21, 2017, 09:10:59 PM »
Quote from: Mike Callas on August 21, 2017, 01:52:51 PM
It is almost fully enclosed. I choke it like normal, nothing. I choke it more, nothing. I flood it and drain the fuel by removing the plug, nothing. I cool it off with water and it starts up.
I use ~ 2% castor. I have run 3 gallons thru it and it runs better and better, except for this one minor issue.

   You definitely don't want to choke it "normally" on the second-in-a-row flight, that will cause "shrinky piston syndrome" and then it doesn't want to start and the compression will go away. Cold fuel gets on the back of the piston, cools it off, the cylinder is still hot, so no go. Try it with no choke at all. If it burps and then quit lean like it ran out a prime, then you are in trouble, because now it won't start. Remove the battery, flip it through a few dozen times, attach battery, then back-bump. Next time, try ONE pull-through with your finger over the hole, then start.

    My guess is that your "normal" choking is far too much, and you need to do it less, or not at all.

    Brett
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Offline Mike Callas

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Re: Stalker 76 Hot Re-start No bueno
« Reply #8 on: August 21, 2017, 11:23:10 PM »
I shall try the "no prime" method next. The shrinking piston theory sounds plausible.

The only reason I want back-to-back flights is to squeeze in a couple of flights after work before the sun gets too low.

Practice, practice, practice. I hope to make it to Carnegie Hall someday.
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Offline Peter Nevai

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Re: Stalker 76 Hot Re-start No bueno
« Reply #9 on: August 21, 2017, 11:44:40 PM »
Quote from: Mike Callas on August 21, 2017, 11:23:10 PM
I shall try the "no prime" method next. The shrinking piston theory sounds plausible.

The only reason I want back-to-back flights is to squeeze in a couple of flights after work before the sun gets too low.

Practice, practice, practice. I hope to make it to Carnegie Hall someday.

Words from the wise. Les McDonald quote "CLPA became an obsession it impacted my marriage, my relationships, my life, so much so that I could never go back to just causal Sunday flying" Remember this is only a hobby, miniature model airplanes that go round and round in a circle and all.
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Words Spoken by the first human to set foot on Mars... "Now What?"

Offline Brett Buck

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Re: Stalker 76 Hot Re-start No bueno
« Reply #10 on: August 22, 2017, 01:00:45 AM »
Quote from: Mike Callas on August 21, 2017, 11:23:10 PM
I shall try the "no prime" method next. The shrinking piston theory sounds plausible.

The only reason I want back-to-back flights is to squeeze in a couple of flights after work before the sun gets too low.

  We do that all the time, basically, take two flights back-to-back, then the next guy does two, etc. It cuts time spent moving airplanes on and off the circle in half.

    It's a very well-known issue. The PA61 didn't want *any* choking on the second flight. The RO-Jett 61 takes a few pull-throughs. But you can't choke it too much or it does exactly as you indicate, and you can feel the compression go away (and come back after a lot of flip-throughs).

   Almost always, the engine will start in any conditions, if you find the right technique. I sometimes flew 10-15 flights in a row with the Fox 35, land, fuel up, hook up stooge, flip, fly again, day after day, no problems. And the Fox is notorious for "poor hot starts".

    Brett
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Online Steve Helmick

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Re: Stalker 76 Hot Re-start No bueno
« Reply #11 on: August 25, 2017, 08:22:58 PM »
'Lectric finger. This setup is just awesome!   y1 Steve
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