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Aviation

Navion

 

TO ALL NAVION OWNERS:

If you own a Navion, it is certain that you will be interested in what Wing Tip Tanks can do, from the standpoint of transferring rearward loaded aux fuel, to the center of gravity at the wing tip. If you are without an existing auxiliary fuel system, you will be even more interested in our OSBORNE 20 gallon Wing Tip Tanks. Even on short flights, for example from point A to point B and returning without having to refuel at point B, not to mention the fuel savings when topping off with low priced fuel.

OSBORNE, formerly Brittain Industries, pioneered the development of wing tip tanks for civilian aircraft many years ago. Recently, we developed a completely redesigned wing tip tank (20 gallons each) for the Navion, Twin Navion, Bonanza and (15 gallon) tip tank for the Single and Twin Comanche. The all aluminum 20 gallon wing tip tank, is streamlined and smooth, with recessed Nav/Strobe lights, a flush filler well and concealed drain. By means of drop hammer dies, the shells are formed of heat treated aluminum which is hardened to resist dents and distortion. The tank is assembled with flush welds, eliminating any raw edges or flanges protruding into the line of flight. We consider this tank aesthetically and aerodynamically outstanding. Its appearance and design is such that Princeton University Research Center chose our tank for external fuel cells on a ground effect vehicle that was under development.

Salient features of the installation are simplicity of the mounting of the tank which requires no rework of the wing whatsoever. Fuel lines are readily routed on the external surface of the rear spar in the aileron and flap bay. The fuel system is a direct feed system with manually operated four-position selector valve. A unique aileron balancing method, which eliminated the external bob-weight beneath the wing of the Navion, is utilized.

The aerodynamic efficiency of the airplane itself is improved by addition of the new style tip tank. Proof of this statement is found in carefully controlled FAA Flight Tests which established enough end plate effect, and consequent improvement in rate of climb, as to allow for additional gross weight increase of 250 pounds (See Table 1). Further proof of additional lift is found in the fact that those Navions equipped with stall warning devices require relocation of the actuator on the leading edge of the wing to compensate for the increased angle of attack of the wing required to produce a stall with the OSBORNE tanks in place on the tip.

An increase in cruising speed is obtained as a result of increasing the lift where, at high altitudes in thinner air, on-the-step performance occurs even at the lower indicated air speed. Furthermore, the fact that the weight carried in the OSBORNE Wing Tip Tank is precisely at the c.g., eliminates the disadvantages of under-seat or baggage compartment fuel installations wherein one is conscious of a rearward loading condition. Owners who have installed the OSBORNE Tank will attest to an overall increase in cruising speed of 4-6 mph.

Another outstanding feature is the increased stability, which results from the installation of wing tip tanks. This can best be compared with a tight-rope- walker who carries a long pole that is weighted at either end. Without it, he surely will topple to one side or the other. Although the Navion is an outstanding stable aircraft, the increased stability and the “feel” that results from the addition of wing tip tanks gives the airplane the feeling of a light Twin and can only be fully appreciated by flying a Navion that is so equipped.

All in all, you find that the installation of the OSBORNE Wing Tip Tank is a great step toward the improvement of the performance of and utilization of the Navion and a definite stride in the modernization of what is basically a very fine airplane. The increase in resale value of Navions so equipped makes it obvious that this is an improvement and rather than an expenditure. The total weight added by the modification is only 20 pounds. The allowable increase in gross weight in 250 lbs. (see Table). One can readily see that the net increase is an appreciable increase in pay-load.
The OSBORNE Wing Tip Tank is produced under careful quality control and FAA Parts Manufacture Approval. The kits come complete with tubing and all necessary hardware and fittings. There are no special jigs or complicated blueprints required. The installation is a recommended 16-25 man hour job, is straight forward and simple enough to be accomplished in the field by the average mechanic. For more information write or call: 

 J. L. OSBORNE Incorporated
18173 OSBORNE Road
Victorville, California 92394
Telephone Number (800) 963-8477
or (760) 245-8477
Fax number: (760) 245-5735