Cox 020...muffler? - RC Groups
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Nov 09, 2017, 04:38 PM
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Cox 020...muffler?


I picked this up, I can't quite figure out the purpose of this thing wrapped around the cylinder. Maybe a muffler or something to reduce the power?
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Nov 09, 2017, 05:26 PM
the great GassifÔer
Probably just something to keep the crud out after a bad landing or so....

These engines were used mainly in free flight and such, and landing was uncontrolled....
Nov 09, 2017, 07:39 PM
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fiery's Avatar
Looks like a band from a worm drive clip adapted for the purpose noted in the above post.
Nov 09, 2017, 08:23 PM
Registered User
Quote:
Originally Posted by fiery
band from a worm drive clip .
A piece of hose clamp around here.
Nov 09, 2017, 09:52 PM
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coriolan's Avatar
It was a Cox experiment around 1976/77( also done on .049 Babe Bee)to replace the earlier version which was a screen. Explained here:
https://www.rcgroups.com/forums/show...ee-020-exhaust
About mid page:
http://www.mh-aerotools.de/airfoils/...uctengines.htm
Product Engine .049 (0.8 cm≥)

Quote:
Manufactured between 5/1976 and 9/1977 (#191-5, ECJ #28d)

This engine was equipped with a mesh exhaust screen to prevent painful burns. This was the first solution for people complaining about burning their fingers when priming with too much fuel might have caused a small fireball when they applied power to the glow plug. Another (and maybe more important) effect of the wire screen was to limit power and thus speed, facilitating to fly the C/L models. A small and heavy plastic C/L model with a .049 running at full speed can fly quite fast and is thus difficult to control for the beginner.

This particular engine has probably been used in a PT-19 trainer airplane.

{thanks to Joe Wagner for discussing the exhaust restriction topic}


Quote:
Product Engine .049 (0.8 cm≥)

Manufactured between 9/1977 and 2/1978 (#192-3, ECJ #34a)

As the mesh screen was difficult to manufacture and to attach to the cylinder, this engine was equipped with a slotted exhaust screen. The final, cost effective solution to limit power was the double slotted cylinder.

This engine has been used in the F-15 Eagle and Falcon airplanes. The screen was spot welded to the cylinder.
Nov 09, 2017, 09:58 PM
Registered User
Ah, interesting. Thanks.


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