Today I first started my sj.91 with torque muffler,after about 1 liter of fuel(5%) the engine made 12.1k with an apc 12/8,the engine is also quite noisy but not these is the problem: because the end of these huge muffler is ver near to the wing's L.E. I nstalled a du-bro exaust diverter secured with a plastic tie zap, what happened? after 5 seconds a full military the ex. diverter is blown away and the (very )hot gases warm the monokote tht covers the wing,I also noticed that without the ex diverter the engine is more noisy. the question is :how can I secure the ex diverter to the muffler(cyano?)

Hi,

Thank you for writing....

A number of Jett pilots fly with the exhaust diverter tubes. However, you want to make sure you have the larger one, with an inside diameter that is larger than the exhaust outlet.

If the ID is too small, or if you have a kink in the tube, you will restrict the exhaust and cause the engine to run poorly.

Typically installation of a silicone type extension tube is simple.

1) clean the tailcone of the muffler with alcohol. Let dry

2) clean the diverter with alcohol

2) apply a thin film of high temperature RTV silicone. You only need a small amount.

3) Install the exhaust diverter. Use the cable tie to secure it in place.

Allow this to cure/dry for at least 24 hours.

When done, it should remain secure.

Attached is a photo of such an installation. A good number of flights on this particualar aircraft.


I trust this is helpful.

Bob Brassell

pease explain me what means RTV silicone, I glued my ex. diverter with black c.a. and seems to work

Do a web search for RTV + silicone + "high temp"

It is "room temperature vulcanizing' silicone glue/sealant. Fairly common.

Dow Corning, GE, Permatex and others make similar 1 part silicone sealant that is suitable for higher temperatures. They all come in tubes. Locally here, the material can be found at any automotive parts store.