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Arnold and Judy Charlton
South Africa
KIS TR1
Jabiru 3300
Airmaster AP332
We sure are enjoying the Airmaster Propeller.
In general, the average improvement is around 20 %.
During our early test-flights we noticed that the CHT would remain high during climb-out & full throttle straight & level. We had used the cylinder-baffles as supplied by Jabiru, all details according to their specs. We then made new baffles from fibreglass which have more space on top of the cylinders.
Problem solved, we can now operate at full throttle continuously without seeing more than 150 degrees C, a reduction of 50.
However we noticed that the oil-temp increased as a result, no doubt, of internal air-flow. We then queried the oil-cooler as supplied by Jabiru (transmission type) & figured that this cooler was designed for low pressures. We then replaced it with a Serck-type engine-oil cooler (which we used in our motor-racing days) & modified the internal ducting to give a dedicated outlet. This also increased the oil quantity slightly. Problem solved again.
We now have no cooling problems at all, even with our sometimes 38 degrees C ambient & 4700 ft field height.
As a matter of interest, we have a mould for these baffles & as indicated to Marcus earlier we could supply these at a nominal US $50 plus freight.
We also had to manufacture our own engine mount to mate the Jabiru 3300 to the standard KIS (now Pulsar), which meant constructing a jig which was then given to our local aircraft-specialist welding expert who constructed a masterpiece. We still have the jig & could reproduce those as well.
Come to think of it we also made all engine cowls firewall-forward from scratch & have those moulds too!!
The following information is from data collected from our Kis TR-1 with Jabiru 3300 engine, fitted with the Airmaster prop.
Airfield elevation is at 4740ft., so we checked ROC 5500ft to 6500ft, stabilised, then from 6500ft to 7500ft, stabilised, then from 7500ft to 8500ft.
This was repeated in all 3 modes, being
T/O at 3000 rpm
Climb at 2800 rpm
Cruise at 2600 rpm
T/O mode 800, 600 & 550 fpm
Climb mode 550, 500 & 475 fpm
Cruise mode 550, 500 & 400 fpm
The above speeds were tested at a climb-speed of 100 mph IAS, but we intend to re-test at higher speeds.
Our all-up weight was around 1330 lbs, ambient temp around 10 degrees C.
We also checked IAS at 6500 ft, straight & level in all 3 modes.
T/O mode 155 mph
Climb mode 163 mph
Cruise mode 160 mph
(These figures have not been corrected for Density Altitude)
Take-off distance was about 650 ft, approaches were flown at 85 to 90 mph in T/O mode (during which we carry more rpm than previously)]
Thanks again for a super product,
Regards, Arnold & Judy Charlton.
charlton@parys.co.za
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