Today's Message Index:
----------------------
1. 04:09 AM - Re: Twin lead throttle cable (wingnut)
2. 06:05 AM - Re: Twin lead throttle cable (Tom Jones)
3. 08:16 AM - Re: Fuel line (Don G)
4. 10:06 AM - Re: Twin lead throttle cable (wingnut)
5. 10:53 AM - Re: Re: Twin lead throttle cable (Pete Christensen)
6. 12:02 PM - Re: Re: Twin lead throttle cable (floran higgins)
7. 01:47 PM - Re: Re: Twin lead throttle cable (Vic Baker)
8. 03:39 PM - Re: Kreem Problem Follow Up (Ken Potter)
9. 06:00 PM - Re: Twin lead throttle cable (wingnut)
10. 07:42 PM - Re: Re: Kreem Problem Follow Up (Brian Morissette)
Message 1
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| Subject: | Re: Twin lead throttle cable |
Sounds like the spring on your throttle is reversed from mine. On mine, the throttle
wants to go wide open. The idea of a friction lock being the only thing
keeping the the engine from roaring to full throttle when I'm taxiing around makes
me nervous. I've heard of people installing counter balance springs on the
old cam operated version of the throttle. Anyone figure out how to do something
similar with the twin lead throttle?
> I started out flying my kitfox by setting the friction enough to hold the RPM
but still be able to push the throttle in...I thought. On my second or third
takeoff I took my had off to scratch my nose and it slipped back to idle at about
100 feet off the ground and scared the crap out of me. I thought the engine
had done did the dreaded two stroke seizure.
--------
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=254070#254070
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| Subject: | Re: Twin lead throttle cable |
> Sounds like the spring on your throttle is reversed from mine. On mine, the throttle
wants to go wide open.
Yes, two stroke Bing 54 carbs. The carb springs close the throttle.
--------
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=254079#254079
Message 3
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I replaced the tank to header mil-spec fuel hose with SAE J30R9 fuel injection
hose last year on my speedster. I did NOT replace the smaller line from fuel pump
to Tee to carbs on the 912. It looked so good ....and I did not the right
size on hand. "Gonna do that later" I told myself.
Last month...the KitFox put me a foot for the first time. Had an off field landing
due to extreme reduction in power...but not quite engine out..ran fine at
idle or slightly above..but not enough to keep flying. This after aprox 30 minutes
of flight at normal performance.
Anyway...found the smaller size fuel line (and still the original Mil-spec) from
mechanical pump to carbs was swelled shut inside, or almost shut.
Felt pretty dumb.....
another queer thing...after I slit the mil-spec fuel line to examine the curious
swelling inside, I threw it over on the bench and left it. The following day,
a hanger neighbor came over and asked if I had discovered what was wrong..I
say yea..look at that piece of line over there on the bench. He walked to the
bench and examined it...I was busy working on the aircraft...and he said...so...what
wrong with this?
I went over there and was going to show him and guess what...the swelling was gone
and it looked as new...aside of the slit I had made in it!
I told him..well, believe it or not, yesterday this line was swelled shut inside
with all kind little bumps and baggy things and...!..He looked at me kinda
funny and said..Oh yea?
This prompted me to stick a bolt in the end of the other intact piece from the
other carb, and hang it in the vise and fill it with fuel..(93 octane alcohol
free mo-gas). Yes, it had returned to normal also..after about 20 minutes..I looked
over and the fuel was running out of the top and it was swelling shut inside.
Important point here..I have never had an alcohol in this plane, ever.I test it
all the time....only straight mo gas and 100LL.
The different solvents and additives that are in mo-gas that are destructive to
rubbers are not limited to alcohols. Congress has a great time re-formulating
mo-gas yearly and Fuel component mfgs. are struggling to keep up with resistant
products. Today..SAE J30 R9 spec hose is about as tough a product as you can
get..and as resistant..although not conforming to the latest non-permeable requirement.
It seems it takes a "tygothane" style line to comply with that...but
I dont like them due to their fragility. I like thick walled..corded style
automotive for its durability and puncture resistance and bend radius. USe you
own judgement,,,but if your fuel lines are over a couple years old..replace the
with the latest production and SAE spec you can find, regardless of their condition.
If you are building...use steel or aluminum where ever you can.
--------
Don G.
Central Illinois
Kitfox IV Speedster
Luscombe 8A
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=254112#254112
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| Subject: | Re: Twin lead throttle cable |
Part of the problem with the throttle spring is that they are relatively short
so the tension is quite high at the idle setting. Perhaps a longer spring would
even out the tension and keep it reasonable at idle. Any thoughts on the wisdom
of modifying the spring mechanism in a 912UL throttle?
--------
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=254135#254135
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| Subject: | Re: Twin lead throttle cable |
What's wrong with no spring?
Pete
----- Original Message -----
From: "wingnut" <wingnut@spamarrest.com>
Sent: Tuesday, July 21, 2009 12:03 PM
Subject: Kitfox-List: Re: Twin lead throttle cable
>
> Part of the problem with the throttle spring is that they are relatively
> short so the tension is quite high at the idle setting. Perhaps a longer
> spring would even out the tension and keep it reasonable at idle. Any
> thoughts on the wisdom of modifying the spring mechanism in a 912UL
> throttle?
>
> --------
> Luis Rodriguez
> Model IV 1200
> Rotax 912UL
> Flying Weekly
> Laurens, SC (34A)
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=254135#254135
>
>
>
Message 6
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| Subject: | Re: Twin lead throttle cable |
I tried to operate a 912 ULS without the throttle springs. The throttles
would not stay in syc.
I wound up installing lighter springs. Still have to use the friction lock,
but it is much easier with the lighter springs.
Floran Higgins
Helena, Mt.
Speedster
912 ULS
----- Original Message -----
From: "Pete Christensen" <pchristensen10@austin.rr.com>
Sent: Tuesday, July 21, 2009 11:41 AM
Subject: Re: Kitfox-List: Re: Twin lead throttle cable
> <pchristensen10@austin.rr.com>
>
> What's wrong with no spring?
>
> Pete
>
> ----- Original Message -----
> From: "wingnut" <wingnut@spamarrest.com>
> To: <kitfox-list@matronics.com>
> Sent: Tuesday, July 21, 2009 12:03 PM
> Subject: Kitfox-List: Re: Twin lead throttle cable
>
>
>>
>> Part of the problem with the throttle spring is that they are relatively
>> short so the tension is quite high at the idle setting. Perhaps a longer
>> spring would even out the tension and keep it reasonable at idle. Any
>> thoughts on the wisdom of modifying the spring mechanism in a 912UL
>> throttle?
>>
>> --------
>> Luis Rodriguez
>> Model IV 1200
>> Rotax 912UL
>> Flying Weekly
>> Laurens, SC (34A)
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=254135#254135
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
Message 7
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| Subject: | Re: Twin lead throttle cable |
There was a post some months ago concerning a Kitfox crash into the trees
off the end of a runway. The carb springs had been changed out for a weaker
spring. One of the throttle cables failed and the weaker spring would not
return the carb to full open.
Consider getting a "vernier" type throttle setup, Kitfox LLC can fix you
up. I've still got the friction lock type throttle with the original
carb springs. I'm used to it now, but, for awhile had considered weaker or
no springs - or the "vernier" type throttle.
Vic Baker
S7 912S Warp
Carson City, Nv
----- Original Message -----
From: "floran higgins" <cliffh@outdrs.net>
Sent: Tuesday, July 21, 2009 11:35 AM
Subject: Re: Kitfox-List: Re: Twin lead throttle cable
>
> I tried to operate a 912 ULS without the throttle springs. The throttles
> would not stay in syc.
> I wound up installing lighter springs. Still have to use the friction
> lock, but it is much easier with the lighter springs.
>
> Floran Higgins
> Helena, Mt.
> Speedster
> 912 ULS
> ----- Original Message -----
> From: "Pete Christensen" <pchristensen10@austin.rr.com>
> To: <kitfox-list@matronics.com>
> Sent: Tuesday, July 21, 2009 11:41 AM
> Subject: Re: Kitfox-List: Re: Twin lead throttle cable
>
>
>> <pchristensen10@austin.rr.com>
>>
>> What's wrong with no spring?
>>
>> Pete
>>
>> ----- Original Message -----
>> From: "wingnut" <wingnut@spamarrest.com>
>> To: <kitfox-list@matronics.com>
>> Sent: Tuesday, July 21, 2009 12:03 PM
>> Subject: Kitfox-List: Re: Twin lead throttle cable
>>
>>
>>>
>>> Part of the problem with the throttle spring is that they are relatively
>>> short so the tension is quite high at the idle setting. Perhaps a longer
>>> spring would even out the tension and keep it reasonable at idle. Any
>>> thoughts on the wisdom of modifying the spring mechanism in a 912UL
>>> throttle?
>>>
>>> --------
>>> Luis Rodriguez
>>> Model IV 1200
>>> Rotax 912UL
>>> Flying Weekly
>>> Laurens, SC (34A)
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=254135#254135
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
>
Message 8
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| Subject: | Re: Kreem Problem Follow Up |
Brian;
Kreem is available from JC Whitney online and they do ship to Canada.
Cheers
Ken
--------
Ken Potter
Model II, No. 483
Rotax 582, C-Box,
98% Complete
C-FJKP (marks reserved)
Lanark, Ontario
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=254204#254204
Message 9
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| Subject: | Re: Twin lead throttle cable |
I definitely would have considered the venier type throttle from Kitfox but I'd
already purchased this one from Aircraft Spruce. I didn't realize the implications
of the friction style lock until I had it installed.
The instructions for the throttle state that they can not be used to 'push' so
some kind of spring is necessary. The crash report on a Kitfox using weaker springs
is sobering. I think I'll try finding a way to fit longer springs that will
provide the same tension but more consistently.
Thanks all for the ideas.
--------
Luis Rodriguez
Model IV 1200
Rotax 912UL
Flying Weekly
Laurens, SC (34A)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=254233#254233
Message 10
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| Subject: | Re: Kreem Problem Follow Up |
Hi Ken
Thanks
I found it today locally here in Sudbury at a business called the "Shop"
705-682-4463. They bring it in at $48.95 for a one liter kit.
Brian
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Ken Potter
Sent: July 21, 2009 6:36 PM
Subject: Kitfox-List: Re: Kreem Problem Follow Up
Brian;
Kreem is available from JC Whitney online and they do ship to Canada.
Cheers
Ken
--------
Ken Potter
Model II, No. 483
Rotax 582, C-Box,
98% Complete
C-FJKP (marks reserved)
Lanark, Ontario
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=254204#254204
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