"CindyB" wrote in message
...
On Jan 20, 11:01 am, " wrote:
Our club in Indiana is looking for advice and / or experience in
converting Pawnee Tow planes to run on motor fuel. Any comments or
advice would be gratefully accepted .

Aside from all the other valuable technical expertise which has
been shared,

check your insurance policy. You may find that, FARs and STCs
notwithstanding, use of MOGAS may be prohibited by your coverage.

Best wishes,
Cindy B

So, MOGAS is not really practical, safe or insurable and no other substitute
for 100LL is currently available or likely to be in the foreseeable future.

100LL requires TEL which is only made by one company in India. This
company's product is not primarily for use in airplane fuel but for those
few countries that still allow leaded automobile fuel - most of whose names
end in "stan". AVGAS uses only a tiny fraction of their production.
Globally, there seems to have been an accelerating move to eliminate TEL
from motor fuels. The latest to ban TEL is Uganda. The future looks grim
for the worlds sole TEL producer.

In the US and Canada there was a huge protest from auto racing organizations
who said they needed TEL for their high octane racing fuels. They lost
because the courts said that auto racing was a "hobby" whose need for TEL
did not offset the far greater risk to public health.

There is now a move afoot within the US EPA to characterize those remaining
non-turbine aircraft as "antique and hobby in nature". The environmental
lobby is submitting petitions claiming that the lead exemption for aviation
gasoline "has lasted long enough".

We need to be thinking of some alternatives.

Bill Daniels