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Old Nov 12, 2006, 07:44 PM
Private Pilot/K5MBV/SCUBA
Nicetie's Avatar
Garland, Texas
Joined Jan 2006
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Discussion
US Engines and Quadra

I bought an airplane with a US Engines 41. Does anyone know the history
of these engines. I'm told they are identical to the Quadra. They aren't.

I know it's a heavy low powered engine, but don't know how well they start,
run, and last. If you have experience with them, fill me in.

Mine had a stripped prop adapter that I repaired with a heli-coil. The metal
(aluminum) seemed awful weak to tighten a prop bolt onto, but now it's OK. Is the rest of the engine poor quality too?

Ken K5MBV
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Old Nov 12, 2006, 08:34 PM
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Blissfield, Michigan
Joined Apr 2005
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I have a couple of US Engines 35 and one 25 - they have always ran just fine for me - no complaints , Jim W1SJG
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Old Nov 12, 2006, 08:44 PM
Private Pilot/K5MBV/SCUBA
Nicetie's Avatar
Garland, Texas
Joined Jan 2006
1,077 Posts
Quote:
Originally Posted by Maineiac63
I have a couple of US Engines 35 and one 25 - they have always ran just fine for me - no complaints , Jim W1SJG
Jim, does the kill switch short the wire to ground for running or for
disabling the magneto? I haven't started mine yet and don't want
to accidently get spark while choking the engine. ...ouch

tnx, Ken K5MBV
73's
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Old Nov 13, 2006, 12:58 PM
NM2K
Ringgold, GA, USA
Joined Jan 2006
1,045 Posts
Quote:
Originally Posted by Nicetie
I bought an airplane with a US Engines 41. Does anyone know the history
of these engines. I'm told they are identical to the Quadra. They aren't.

I know it's a heavy low powered engine, but don't know how well they start,
run, and last. If you have experience with them, fill me in.

Mine had a stripped prop adapter that I repaired with a heli-coil. The metal
(aluminum) seemed awful weak to tighten a prop bolt onto, but now it's OK. Is the rest of the engine poor quality too?

Ken K5MBV

--------------


They weren't bad before they moved the factory. After that they suffered a great deal in their reputation.

If you have a good one, they will do the job.

Once you get the starting drill down, they really aren't bad to hand start. But you will need a good shoulder and arm if the spring starter is missing.
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Old Nov 13, 2006, 01:04 PM
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Palmdale, CA
Joined Oct 2000
13,371 Posts
Quote:
Originally Posted by Artisan
--------------


They weren't bad before they moved the factory. After that they suffered a great deal in their reputation.

If you have a good one, they will do the job.

Once you get the starting drill down, they really aren't bad to hand start. But you will need a good shoulder and arm if the spring starter is missing.
.
AMEN!
I bought a US Engines 35 cc after having a Quadra 35cc.
Supposedly, the US E had been factory run.
After pumping on that thing for 4 hours, the next day after I recovered, I found the carb had been installed -backwards-... so the pressure input to the carb from the crankcase was facing out, to atmosphere. It couldn't pump diddly!
Fixed that, and installed the spring starter, and it worked fine.
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Old Nov 15, 2006, 10:58 AM
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God's gift to mankind for flying anything.
Joined Aug 2004
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Running a 41 cc US engine. A bit hard to start "on its own", but I do use a small squirt of "canned engine starter". One small squirt, one pull and she runs.
You do have to make sure that your needles are set correctly.
I also use the angled deflector intake on it. Do not really know if it helps or not.
If you do "prime the engine", you do not have to worry that she will accidentally start. Just keep your thumb on the inlet and rotate (not flip) a couple of times while holding the prop with your full hand, and do not let go until you have turned the prop fully.
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Old Nov 15, 2006, 03:08 PM
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Blissfield, Michigan
Joined Apr 2005
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The wire from the magneto goes thru the kill switch, so when the kill switch is off the plug gets no spark. I do mark my switch with a red mark so I know if it's in the right position. I don't know who or when but someone showed me how to take the prop in hand and just go back and forth thru the compression stroke while stuffing a finger (thumb?) in the carb to prime the engine and when the finger tip gets wet the you're ready to open the switch and she should fire right up.
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Old Nov 15, 2006, 03:50 PM
Private Pilot/K5MBV/SCUBA
Nicetie's Avatar
Garland, Texas
Joined Jan 2006
1,077 Posts
Quote:
Originally Posted by Maineiac63
The wire from the magneto goes thru the kill switch, so when the kill switch is off the plug gets no spark. I do mark my switch with a red mark so I know if it's in the right position. I don't know who or when but someone showed me how to take the prop in hand and just go back and forth thru the compression stroke while stuffing a finger (thumb?) in the carb to prime the engine and when the finger tip gets wet the you're ready to open the switch and she should fire right up.
Maineiac63,
OK, Thanks for the info. Hope mine works this well. I had to cut a big hole
in the cowl to get my finger in for choking.

The weather is really nasty out right now. Maybe tommorrow I can run it.
It's 49 deg, but the wind is blowing 35MPH with gusts to 50MPH!

One question: When the switch is OFF is it closed or open ie. wire to coil
grounded not? This was what I should have asked in the beginning, since
I still don't know the answer. My switch has no marking but I can check
it with an ohmeter after pulling the connecter from the coil pin.
Thanks, Ken
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Old Nov 15, 2006, 06:52 PM
Ascended Master
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Palmdale, CA
Joined Oct 2000
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My experiences with gas motors led to use two kill switches, in series.
One the usual manual, easily accessied without exposure to the prop, and the other on a servo, which could be shut off in flight.
This is particularly useful in a twin.
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Old Nov 15, 2006, 07:45 PM
Private Pilot/K5MBV/SCUBA
Nicetie's Avatar
Garland, Texas
Joined Jan 2006
1,077 Posts
Quote:
Originally Posted by Sparky Paul
My experiences with gas motors led to use two kill switches, in series.
One the usual manual, easily accessied without exposure to the prop, and the other on a servo, which could be shut off in flight.
This is particularly useful in a twin.
Hi Sparky Paul,

But, does grounding the mag/coil kill pin allow the engine to start or does it kill it? I guess by deduction from your post that grounding the pin allows
the motor to run since you had them in series so that either could kill the engine. I've had several replys to this post and not one of them has answered
the question, but I got a lot of good advice.

I like the servo method. Is there a gizmo to operate as a switch from a servo channel output or do I have to cobble a mechanical one?

Ken
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Old Nov 15, 2006, 08:27 PM
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Palmdale, CA
Joined Oct 2000
13,371 Posts
Ken, it's as simple as using a servo wheel with a cutout that releases the roller on a switch..
Channel 5 is usually the retract channel, and works fine for this.
I've used it for on-off with electric motors, before the days of ESCs, also.
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Old Nov 15, 2006, 08:57 PM
Private Pilot/K5MBV/SCUBA
Nicetie's Avatar
Garland, Texas
Joined Jan 2006
1,077 Posts
Quote:
Originally Posted by Sparky Paul
Ken, it's as simple as using a servo wheel with a cutout that releases the roller on a switch..
Channel 5 is usually the retract channel, and works fine for this.
I've used it for on-off with electric motors, before the days of ESCs, also.
Guess I'll visit Radio Shack tomorrow. Everything electronic and
semiconductor in junk boxes, but no electrical parts here. No switches
of any kind. Haven't even seen a microswitch in years. This would be
the easist way to do this. Two switches would be safer too, so I'll
pick up a SPST toggle switch while I'm there.
Ken
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Old Nov 16, 2006, 01:30 AM
Registered User
Joined Oct 2006
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Quote:
Originally Posted by Nicetie
Hi Sparky Paul,

But, does grounding the mag/coil kill pin allow the engine to start or does it kill it? I guess by deduction from your post that grounding the pin allows
the motor to run since you had them in series so that either could kill the engine. I've had several replys to this post and not one of them has answered
the question, but I got a lot of good advice.

I like the servo method. Is there a gizmo to operate as a switch from a servo channel output or do I have to cobble a mechanical one?

Ken
Grounding the wire from the Mag kills the ignition
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Old Nov 16, 2006, 06:42 AM
<>< AKA W4BPS
USA, TN, Tullahoma
Joined Dec 2001
2,428 Posts
Us 41

About 6 years ago I built a Sig 120 4 Star. I put a US 41 on it.. It started, ran, and pulled the model "very" well. I flew it for 2 yars, traded it, that owner flew it for a year or so and sold it to the 3rd owner. I saw it at a flyin this summer and it is still running perfect. I ask the present owner about the motor and he told me he had done nothoing to it but clean the screen and replace the plug.. The US 41 is a little heavy, but used on the right model, they are a great motor for the money.. Brian Smith
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Old Nov 16, 2006, 11:04 AM
Private Pilot/K5MBV/SCUBA
Nicetie's Avatar
Garland, Texas
Joined Jan 2006
1,077 Posts
Quote:
Originally Posted by Crusty
Grounding the wire from the Mag kills the ignition
THANK YOU Crusty!
Ken
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