GR7Racer
Posts: 77
Joined: 2/6/2006
From: , CA, USA
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Ok everybody.....these are very PRELIMINARY....but here's the first draft on the new rules for the Sundowner class. We're still trying to nail down the details on the muffler, so stay tuned. You can get more info on Giant Scale racing and the USRA at www.usrainfo.org
The racing schedule is also up there, and the Sundowner class will be offered at the final two events this year in August at Ohio, and in October at Arizona/California.
Here's what we have so far, and let me know if you have any questions.
12 USRA Provisional Class: Hangar9 Sundowner F-1Lite Class
12.1 INTENT
To provide a low cost “entry level” Reno style F-1 racing event for all pilots. The Sundowner/F-1 Lite class is intended to provide a less expensive means of introducing “new “racers to giant scale racing and to increase membership in the USRA. Initially, The specifications have been developed to create a one plane and engine event that will provide a level playing field amongst the aircraft and place the competitive emphasis on flying and calling. Once a competitor has grown proficient in this class, they will be encouraged to move on to the Giant Scale USRA classes.
12.2 SPECIFICATIONS
12.2.1 GENERAL - All pertinent AMA / USRA safety rules apply. Servos operating all control surfaces must be of sufficient size with at least 69.5 in.oz. of torque. The battery capacity must be a minimum of 200 mah per servo. USRA engine safety cable is required.
12.2.2 AIRCRAFT – Hangar 9 Sundowner ARF kit with no modifications to the airframe. Model must be built according to manufacturer instructions including control linkages, tail wheel assembly, etc. Tape can be used to seal airframe gaps or openings. When in doubt, if the rules don’t say that you can do it, then you can’t.
12.2.3 ADDITIONAL AIRFRAME REQUIREMENTS
12.2.3.1 Landing Gear - Landing gear and wheel pants must be used unmodified as they come in the kit. Replacement wheels of the same diameter and width as the original units may be used. A cover may be fashioned to fill the space on the bottom of the fuselage where the landing gear mounts.
12.2.3.2 Spinner - Must be the diameter specified in the manual and of metal construction. No plastic allowed.
12.2.3.3 Covering – Covering may be removed and replaced with different color scheme to aid identification.
12.2.4 ENGINES – Evolution 35GT in stock configuration. No modification is permitted except for screws, spark plugs, prop washers and prop nuts that may come from any source. Carb must remain in stock configuration and the choke plate may not be removed.
12.2.5 Muffler – Muffler must be the stock production unit for the Evolution 35GT designed to fit in the Hangar 9 Sundowner kit. No modifications will be allowed.
12.2.6 Kill Switch – aircraft must have a manual emergency ignition kill switch (momentary push and hold pushbuttons are not permitted) visibly mounted on the exterior of the aircraft. Marking of the kill switch location is encouraged. All aircraft are required to use an on-board ignition kill switch operable from the transmitter, preferably operated by a dedicated servo. If a separate radio channel is not available the ignition switch servo may be slaved to throttle command via a "Y" harness however one servo cannot perform both functions.
12.2.7 Fuel Tank – May be any commercially available tank compatible for use with Gasoline. No bladder or bubble-less tanks. Fuel system must have provision for completely defueling aircraft prior to filling.
12.2.8 PROPELLER - APC 15x12 pattern propeller will be used and will be supplied by the race organizer. No modifications can be made to the prop. Shaft hole may be enlarged. If balancing is necessary, material can only be removed on the front side of one blade.
12.2.9 WEIGHT - Ready to fly dry weight should not be less than 14 lbs, 8oz.
12.2.10 FUEL - Provided by event organizer. A fueling station will be provided to de-fuel and re-fuel aircraft before they are staged for racing. The gasoline/oil mix will be 25:1 as specified in the USRA common rules for AT-6 and F-1GT classes.
12.2.11 RACE IDENTIFICATION - Racing identification will use brightly colored stickers on either the right or left wing panel. The participants will be divided into 5 groups each day and will place the appropriate sticker in the proper location on your aircraft. Each day these groups will be reassigned and the participants aircraft relabeled.
12.2.12 RACE COURSE - The standard 1600 ft. course is normally used for giant scale racing, however for smaller flying sites a 1200 or 1000 ft could be used. It is recommended that typical USRA race procedures be used. This information can be obtained via the USRA Internet site at www.usrainfo.org.
Thanks!
KennyMac
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RE: Sundowner from Hangar 9 - 
