To get the prop flange in the center of the existing
hole I need some cowl measurements.
Place the cowl sitting on the floor in the corner of a room and
and measure the distance to the center of the hole. The
floor represents the firewall.
Then measure the hole diameter. I assume the hole is in the center
of the spinner location.
Also measure the height of the cowl so the prop flange
comes out nearly flush.
The other thing I need is the down thrust and side thrust angles.
Those numbers should be in the plans.
BTW If you don't have a cowl and need to make one it is always a
good idea to use a 16 or 18 inch spinner with the rotary as that
gives more useful volume in the cowl.
Paul Lamar
Hi Paul, here are the cowl photo's and measurements in MS paint, i spoke
with the factory manager, he will trade in my cowl and make me another cowl
in the mold here that can be longer to accomodate a longer firewall to prop
flange distance.
(They offered me the option of doing another complete cowling for the rotary
tango at cost, as they want to support future rotary tangos so we can do
another cowl with a 16" or 18" spinner if you think that will work better)
There is no prop flange cutout in this current cowling yet, the height of
this current cowling differs on either side as shown on photo no. 1
No down thrust angle required, side thrust angle is 1.25 degrees, i have
Tracy's 2:85:1 PSRU.
Alex
Hi Paul, I will do the cowl straight away and email the measurements.
I just finished up the jig for the hole locations with the strips, the photo
is attached now. I had to use 1/8th thick by 1.25" wide steel strips as I
found I kept damaging anything thinner, I will find a UPS or FedEx tomorrow
to ship that over,
Alex
It would be nice if the air scoops were moved down several inches
and made round or half oval instead of oblong. It might be an aesthetic
challenge :) I'll do a 3D of a suggested new cowl. Here it is.
BTW Tango can offer these motor mounts as well as a rotary cowl.
Once the set up is paid for follow on motor mounts will be cheaper.
----------------------------------------------------
I forgot to mention this is an 18 inch spinner and the scoop positions
are optimized for a side mounted rad.
Paul Lamar
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