---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Wed 09/21/22: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:28 AM - Re: Yak50 (Richard Goode) ________________________________ Message 1 _____________________________________ Time: 03:28:42 AM PST US From: "Richard Goode" Subject: RE: Yak-List: Yak50 All the Yaks had the same oil cooler which when new and with a standard 360 hp engine is more than adequate. However what people don't realise is that, over a period of time the inside of the cooler becomes coated with a layer of hard oil residue which acts as a very good insulator and prevents the cooler from working efficiently. People then think that they can simply wash out this residue with a solvent like petrol, but after so many years, there's no way that this will remove everything. So the only way to ensure that the cooler can actually do its job is to send it to a specialist business who have industrial ultrasonic cleaning machines which vibrate the residue out of the coolers. There is also a 50% larger cooler =93 actually the gearbox oil cooler for the MiL 17 helicopter which has exactly the same fittings as the smaller Yak cooler and we have sold a number of these to Sukhoi owners where they are dealing with tuned engines of over 400 hp. But not a simple conversion since inevitably the cowlings need to be modified for the cooler which is physically somewhat larger. Richard. RICHARD GOODE AEROBATICS Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129 e-mail: richard.goode@russianaeros.com www.russianaeros.com WORLD LEADERS IN SOVIET & CHINESE RADIAL AIRCRAFT ENGINES In partnership with Aerometal Kft, Hungary. From: owner-yak-list-server@matronics.com On Behalf Of Peter Gardiner Sent: 21 September 2022 03:50 Subject: Re: Yak-List: Yak50 How many changes to Yak coolers? same cooler for all? different mounts? Regards Peter Gardiner SYLVAN BEACH RESORTS http://www.gumsanchorage.com.au/ http://www.sylvanbeachresort.com.au P.O. Box 380, BRIBIE ISLAND, Queensland...4507 0734088300 0417646838 _____ From: owner-yak-list-server@matronics.com > on behalf of Bill > Sent: Wednesday, 21 September 2022 11:20 AM Subject: Yak-List: Yak50 > Need Yak50 oil cooler. My 50 doesn=99t have the original and oil runs hot. 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