Fuel drain holes
It is a good safety practice to drill a series
of 1/16" holes in the bottom of the fuse (or wings) wherever fuel spills or
leaks from fuel tanks might accumulate.
Additionally drill a few 1/16" holes in the bottom of the
engine bypass duct. A wet spot under your model may alert you to a leaking tank
or an overfill condition. More importantly, eliminating any puddling of fuel in
the model will reduce the risk of a serious fire during a bungled
Slightly Wrinkled Tailpipes O.K.
Wrinkles, ripples, dimples, etc. in a
stainless steel tailpipe are caused by slightly "rich" (too much fuel) during
engine start-ups. This is a common occurrence, especially with electric auto
Deformations of 1/8" to 3/16" depth are not serious and will not
measurably affect the engine or flight performance. The spot welds on a .007"
stainless steel pipe are extremely strong and we have not seen any that have
seperated as a result of a flaming start.
Ideally, the parameters of the E.C.U. program
and operator technique should produce a lean-as-possible start sequence, thus
eliminating the flaming start.
A serious tailpipe fire that causes significant
deformation of the tailpipe will require that it be replaced. The incidence of
flaming starts reduces considerably with operator experience.
On two occasions we have had problems using
pump kerosene. Depending on the supplier, K-1 may not be consistent in quality,
water content, contamination, etc.
Our experience has shown that if you can get Jet-A fuel
at your local airport you should not have any problems that can be attributed
to fuel. Be sure to accurately measure the oil content as your engine
manufacturer recommends and avoid skin contact (with the turbine oil) and
breathing the fumes.
Common sense handling is all that is required.
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