Since 2012 I have been chipping away at building two Sugden Specials and two Nalon Vipers. All four motors are virtually complete. In fact the Sugdens are ready to run, the Viper just need needle valve assemblies

They are all 2.5c.c. compression ignition model aeroplane engines. The Sugden was presented in Aeromodeller magazine as a build series in the mid 50s. The Nalon Viper was designed and built by Norman Long, also in the 50s, it/they (there was a Mk1 and Mk2 version) were reviewed by both Aeromodeller and Model Aircraft magazines.

Thanks to David for the EN36a material, heat treatment and grinding of the crankshafts for the Sugdens.

I have built both a Mk1 and Mk2 Viper, sadly the bosses camera developed an issue when photographing the Mk2. Maybe later….

cheers

Bill

ps The phots are also in an album, they have been inserted apparently at random in and around the text!!

Edited By Bill Pudney on 25/03/2016 02:12:24

Edited By JasonB on 25/03/2016 07:36:51