Today's Message Index:
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1. 05:34 AM - Re: Yak-50 shuttle valve assemblies - WTB (Roger Kemp)
2. 05:39 PM - Re: cold starting savvy, Housai... advice? (JL2A)
Message 1
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| Subject: | Re: Yak-50 shuttle valve assemblies - WTB |
Doug,
Nothing to apologize for. Glad to see YOU are able to be up and at =98
em again. Rest when you need and don=99t over do it. The I need it Now
May need to wait until tomorrow. Your recovery is more important.
God Speed,
Doc
Sent from my iPad
> On Dec 18, 2019, at 3:53 PM, doug sapp <dougsappllc@gmail.com> wrote:
>
> =EF=BB
> Marco,
> Send me a photo of your shuttle valve.
> It looks like they are cutting me loose from the cancer clinic for a few d
ays so we will be back in Omak Sat, Sun, and Monday filling and shipping tho
se orders received via email in the past two weeks.
> My apologies to all those who we have kept waiting.
>
> Doug
>
>
>> On Wed, Dec 18, 2019 at 12:48 PM Marco Caflisch <marco.l.caflisch@gmail.c
om> wrote:
>> Anyone have suggestions for a source for shuttle valve assemblies (housin
g plus ball) for a Yak-50 landing gear system? I'm told that unfortunately o
ne can't use those from a Yak-52.
>>
>> I've so far drawn blanks with M-14P Inc, Doug Sapp and George Coy here in
the US; I also have an email out to Plamen Petkov in Bulgaria. Any other su
ggestions are much appreciated!
>>
>> Many thanks,
>> Marco
>>
>> San Francisco, CA
Message 2
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| Subject: | Re: cold starting savvy, Housai... advice? |
lots of prime on a stationary engine leads to a lot of liquid fuel in the lower
cylinders. Have heard of a few destroyed HS6 'static' priming. I can't see how
pulling blades through by hand has much effect on fuel distribution.
In cold weather I'd say most of the fuel getting sprayed into the supercharger
case from the primer is remaining liquid and pooling in the lower cylinders. This
way you have 3 cylinders way too rich to start, spark plugs literally drowned
in fuel, and the remaining 6 way too lean.
While we don't experience the cold temps of the OP, try just 1 prime, hit start
while simultaneously priming until it fires.
Logic here is that the supercharger impeller is spinning at maybe a couple hundred
RPM while fuel is sprayed onto it, flinging it around to give a more uniform
mixture delivered to *most* of the cylinders.
Drastically reduces the risk of hydraulic lock due over priming, and you don't
have to keep getting in and out of the cockpit!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=493912#493912
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