Yak18 overheating

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Yak18 overheating

Postby zeberdee » Mon Feb 20, 2006 8:59 am

Hi all I downloaded the yak 18t from avsim  yakovlev_yak-18t.zip First what a fantastic plane BUT the problem I am having is keeping it cool. I have read all 47 pages of the read me document but still can't keep it cool. Taxiing from the GA parking to runway 28 at Blackpool (UK) the cylinder head temp was well into the red ( over 300*c)  ;D as I started the take off run the engine quit due to overheating. :o ??? Help Please.
P.S The cowl flaps were full open!!!!
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Re: Yak18 overheating

Postby Falcon500 » Mon Feb 20, 2006 9:04 am

try keeping the propeller pitch at half or 3/4's and make sure you have enough runway for a low power setting and make sure the mixture isnt to thin. ;D Or ask your local aircraft parts dealer for JATO :P
What do I do you ask? I struggle! Then destroy! Then try to put back together what I just broke on accident.....




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Re: Yak18 overheating

Postby Ivan » Mon Feb 20, 2006 10:36 am

Known problem. Fix is coming, but i have no idea what the progress is.

OK first the checklist (there is one in the readme, but that listst the actual values and not the buggy ones in FS)
For any operation on the ground, (and anything under normal cruise levels): open the cowl flaps completely. Don't keep them shut as the manual says unless the temperature gauge refuses to move on 40% RPM setting.
Don't takeoff with the temperature in the 'high' yellow, because you can't make enough speed to get the engine to cool down enough to climb to a cruise altitude.

Max Cruise: max throttle, prop at the big marker at 70%. At the moment this is the maximum climb setting that doesnt overheat, and the maximum cruise setting that doesnt go into overspeed at small wind changes.

Lowest Eco cruise: throttle to around 750mbar then lower pitch to the 60% maker.

As soon as there is a way to fix it i'll post an update, but it seems they are going for a full update path instead of fixing the dynamics (as the temperature stuff works reasonably well inflight)
Last edited by Ivan on Mon Feb 20, 2006 10:40 am, edited 1 time in total.
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Re: Yak18 overheating

Postby zeberdee » Mon Feb 20, 2006 12:08 pm

Many thanks for the replies, Ivan please do post when the update is available. Many thanks Chris
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