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NO. 23

Quickie GU Airfoil Tuft Testing
QAC Horizonltal Rule

QAC Horizonltal Rule


     Many people have asked if anything
can be done to improve the trim change phenomenon associated with rain and
bugs on aircraft which already have the GU canard airfoil. At QAC we have never stopped researching this problem. Some recent tests indicated that a possible solution has been found. To understand how we have “cured” the problem, we must first know what causes it. Research by NASA, QAC, and others indicate that contamination on the leading edge of the GU airfoil causes the boundary layer of air moving over the surface to thicken. As the boundary layer gets thicker, it can no longer follow the top surface and begins to separate at the trailing edge. This separation moves forward increasing the drag and decreasing the lift of the airfoil. This can be seen by the pilot in rain. He will notice that droplets of water will appear to be stagnant on the top rear surface of the airfoil. This clearly indicates separation.
     The solution we have found is the application of Vortex generators to the top surface of the canard airfoil. Vortex generators provide a powerful mixing of the boundary layer and delays the separation.
     We have tested one configuration of Vortex generators on Scott Swing’s Q2 s/n 2229. In these tests we applied the generators to about 24” of span on both
sides and flew with and without tape transition strips with no apparent change in performance or elevator position.
     These tests are just beginning and much remains to be done but we are convinced that this will solve the problem.

Q2 Revmaster New Heads
     Many builders did not receive the letter that QAC sent out regarding the new heads for the Revmaster engine, so we are repeating the announcement here.
     We have asked Revmaster to extend the deadline on this option and they have graciously agreed.
     As mentioned in Newsletter # 22, Quickie has been testing some new cylinder heads and lower induction pipe for the Revmaster engine. This testing has now been successfully completed and the package is now approved.
     The new heads feature larger stainless steel valves, improved seat material, larger ports, and combustion chamber modifications to unshroud the valves.
     The new lower intake manifold is required to flow the extra air that the engine can now use. The compression ratio remains the same. Flight tests by QAC indicate that you may expect the following:

1. At least a 10 mph increase in both cruise & top speed.
2. At least a 200 fpm increase in rate of climb at all gross weights.
3. Improved mixture distribution between the cylinders.
4. Equal or better cooling.
5. At least equal fuel economy at the same cruise speeds.
     A special rate has been established for QAC customers until August 6, 1984 of $650.00 exchange. After that date the price for this option goes to $750.00. Anyone who is flying will be given priority over other orders.
     A core charge of $250 .00 has been established. What this means is that you need not send in your old components until after you have received the new ones. This way no one’s aircraft will be down while waiting for delivery of this option. The core charge will be refunded within 10 days of receipt of the original components.
     A complete set of installation instructions will be included with each package. These instructions will also be available to anyone who wishes to avoid the core charge by sending in the old heads and manifold first
     Revmaster will do the installation for anyone who wishes at their Hesperia, CA facility for a labor charge of $100.00.
     You may order this head option thru your local dealer or QAC and if you have any questions, don’t hesitate to call.

     Current prices will hold until August 6, 1984 when the following prices will be in effect:
1A $4,700.00 - an increase of $805.00
1B. $3,500.00 - an increase of $450.00
Q2 Package 2 $2,050.00 - an increase of $200.00
Q-200 Package 2 (no change) $2,900.00
     There will be a discount of $1,000.00 for those who purchase 1A, 1B, & 2 all at one time after August 6, 1984.
     Those of you who have only purchased Package 1A should keep the deadline in mind.


     Quickie Aircraft has been using and testing Bel-Ray’s Aero-l synthetic aircraft oil for over two years in a number of different aircraft and engines. Aero-1 is FAA approved for both Lycoming and Continental engines including turbo charged models. It is STC’d for 100 hour oil changes. Our experience indicates that oil consumption is drastically reduced with Aero-1 as compared to other oils we have used. Aero-1 does not thin out with heat and can be used at extremely low temperatures as well.
     Aero-1 will be available through QAC shortly, contact us for details.