Fuel tank 120ccm for the legendary stunt model Nobler or similar models.
Weight only 20 grams in Polyamid(PA)
Two chambers for shorter engine run after finished stunt program
Uniflow pipes both upwards and downwards (just plug the one not needed)
A plug is available for the Ø20 hole in the front end.
Look for "Plug for fuel tanks" at this site.
Seal off the plug with an O-ring Ø15 x 2. Silicon for glow and nitrile for diesel.
Secure with a few drops of thick cyano on the outside for easy removal.