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	PeterOZ Site Supporter	Joined: April/04/2009 Australia Posts: 2392 IP Logged
Posted: March/29/2020 at 12:30am		Quote

I'm bored,sick of watching netflix, back to playing world of warships for a while.

Curse certain group, they should stick to making fried rice not viruses!

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	narora Site Supporter	Joined: November/15/2014 India Posts: 60 IP Logged
Posted: March/29/2020 at 12:40am		Quote

Quote: Dragon Slayer

Hey Peter,

 

I have made an aluminium heat shield for the Hitec 645 MG choke servo.

 

You think that this move will help? The proof of the pudding is in the eating, as they say. We shall see.

 

Thanks for your input.

 

I was finally getting around to finishing off the refurbs to the fuse and starting to paint. But it is cold and now pouring rain. This is said to be set in for the next day or two.

 

Cheers

 

Ken

Ken
Dissipation would improve if you increase the surface area of the heat shield by milling channels over it or even better if you can divert this heat from the shield to some metallic/alu component on the fuselage bottom via a flat copper/alu cable. Enjoying your build. Thanks
Naveen

	Doc. Lifetime Site Supporter RAAFMAC, Sydney	Joined: February/04/2005 Australia Posts: 1718 IP Logged
Posted: March/29/2020 at 1:51am		Quote

Hey Ken,

You can get paintable ceramic heat shield from BVM. It's really good stuff, no heat will get through it.

Enjoying this.

BVM Heat Sheild

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	Richard Crapp Lifetime Site Supporter Richard Crapp	Joined: October/30/2004 United Kingdom Posts: 5291 IP Logged
Posted: March/29/2020 at 2:43am		Quote

I know someone who got through 4 throttle servo's in a short time because it was mounted nere the engine.

Servos are not meant to be cooked then hit 7 thousand times a minuet! just saying

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	Dragon Slayer Lifetime Site Supporter Dragon Slayer	Joined: August/04/2006 Australia Posts: 8065 IP Logged
Posted: March/29/2020 at 2:49am		Quote

Thanks Naveen and Doc for your helpful suggestions wrt to the heat shield.

The problem will be attacked one step at a time.

As it is, the servo heat shield has a big negative pressure zone right behind it. If we subscribe to the laws of fluid dynamics (gasses are treated as fluids) then the open gap produced by the open cowl flaps will afford us a considerable flow of air out of the cowl. The low pressure zone behind the t.e. of the open cowl flaps will suck the air out of the hot chamber. This should surely help with the cooling of the servo/heat shield.

If one stands behind the running engine with cowl on, and allows the engine to warm up, and then places a hand behind the cowl flaps you can actually feel warm air emanating from the gap. It is never hot, but just warm. The laser temperature gauge that I use for CHT's will come in handy later to test the level of heat in that servo area.

Then if the temperature in the area in question is too high ( "too high" being defined as the temperature at which the servo no longer works as it should) then we will have to resort to a Doc or Naveen solution in addition.

Of course, we mustn't forget that the servo may not operate correctly because it is too near to EMF splattering around from the close engine and ignition unit.

Also, it must be remembered that the choke servo is designed to run only when the engine is cold. Think about it!

When will we ever use the choke, baring start up, unless it is an emergency and we want to use the choke to stop the engine ?

Stay tuned.

Ken

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To repair.
102" Meister P-47 Moki 150
1/4 Scale P-47 Moki 400
To maiden
Fatface Skyraider DLE 130
Ziroli Hellcat Moki 150

Flying ...
Westland Lysander 168" Moki 250

	Geezer Lifetime Site Supporter	Joined: January/19/2008 United States Posts: 17633 IP Logged
Posted: March/29/2020 at 5:31am		Quote

I ran all the servos (throttle, elev, rudder) under the cowl on a 1/4 scale Nieuport for 15 years and had no problems at all, I'll admit though the engine was a good bit less mass and heat wise.

Doc

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	Dragon Slayer Lifetime Site Supporter Dragon Slayer	Joined: August/04/2006 Australia Posts: 8065 IP Logged
Posted: March/29/2020 at 7:11am		Quote

Quote: Geezer

I ran all the servos (throttle, elev, rudder) under the cowl on a 1/4 scale Nieuport for 15 years and had no problems at all, I'll admit though the engine was a good bit less mass and heat wise.

Doc

Thanks for your input, Doc. Good to know. To me I am more concerned about EMF than heat, but we shall see.

Ken

__________________
To repair.
102" Meister P-47 Moki 150
1/4 Scale P-47 Moki 400
To maiden
Fatface Skyraider DLE 130
Ziroli Hellcat Moki 150

Flying ...
Westland Lysander 168" Moki 250

	PeterOZ Site Supporter	Joined: April/04/2009 Australia Posts: 2392 IP Logged
Posted: March/29/2020 at 7:17pm		Quote

Ken,

get a couple of heat sinks from jaycar or similar place.

https://au.element14.com/fischer-elektronik/sk-81-50-sa/heat -sink-extruded/dp/1211718?gclid=EAIaIQobChMI-vOF3PXA6AIVB7eW Ch3GogLrEAQYBCABEgIVevD_BwE&mckv=s_dc|pcrid|380892800521 |pkw||pmt||slid||product|1211718|pgrid|76493923343|ptaid|pla -840218752289|&CMP=KNC-GAU-GEN-SHOPPING-TEST-NEW

cheers

Peter

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