| ENYA
continues its tradition of high quality model airplane engines
in the current Super Sport (SS) series. These initially
came out in R/C versions; but many in the range can now be
obtained as control-line fitted with a venturi and needle
valve assembly. I have had very good success with the
ENYA 40SS flying stunt and sport.
My motor is the version with plain bearing front end and iron/steel
piston and liner. In contrast, the 45 and 50SS are both
ringed pistons. Ball bearing front ends are available
on all the displacements in the series. The same crankcase
is the base for the larger displacement motors so it is very
sturdy for the 40SS. This results in greater weight
than other 40 size engines but gives more durability.
I think the power available from the 40SS definitely compensates
for the greater weight. So, I do not view the weight
as a major disadvantage. My motor started as an R/C
version converted with ENYA parts available from the manufacturer.
You can either go this route or start directly with the C/L
model (internal parts are the same).
A stock venturi of 0.277" inside diameter is fitted.
This can be either ENYA part number S5021 as I used or a custom
venturi fabricated for the motor. The NVA is standard
ENYA of approximately 0.155" diameter. A Super
Tigre type NVA will also work and is about the same diameter.
Fuel tank is a 4 oz. Sullivan Clunk set up for uniflow without
muffler pressure. I did try muffler pressure but found
the motor runs nicer without it. Also, I suggest you
plan on a 5-6 oz. tank if possible as the 4 oz. is marginal
for the full pattern. The muffler is a tongue design
fabricated by local source.
The 40SS has been flown with both the standard head (full
squish band) and one modified to give a hemi shape to the
combustion chamber. The hemi shape was cut into a regular
stock head to remove about half of the squish band.
Leave about 0.060" of the original squish band remaining.
Both heads run very well but with different styles.
The stock head with full squish band will give a constant
speed run with little break through the maneuvers. The
aircraft is very manageable and there is no evidence of the
dreaded schneurle wind-up. The hemi-head will give a
bit of a 4-2 break; although not the deep traditional 4-2
stunt run. My own preference for the motor favors the
hemi-head providing the slight break. But, your style
may differ. I suggest you start with the stock head
and go from there. The stock head with the full squish
band certainly is acceptable "as is".
Fuel is 5% Nitro with 25% oil (50/50 Castor and synthetic).
Best props to date are either the 11x4 or 11.5x4 APC.
My preference is for the latter to give the larger diameter
resulting in better line tension and acceleration.
After working through the variables to get this engine set
up it has easily become my favorite. The run characteristics
are excellent. The power is quite sufficient to fly
a 600 square inch thick wing stunter through the turbulent
air common at our tree lined flying site. The ENYA quality
is legendary. You may want to consider a 40SS for your
next airplane.
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