Rubber Speed Event

The lighter side of things

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kittyfritters
Posts: 124
Joined: Tue Sep 27, 2016 8:13 pm

Rubber Speed Event

Postby kittyfritters » Tue Dec 18, 2018 4:39 am

Well, there could be debate about whether or not this is really free-flight but the Black Sheep Exhibition Squadron has a Round the Pole Speed contest coming up in the next few months. A typical rubber powered speed model will be about 22 inches long, have about a 9 inch wing span and a 4 bladed prop. In round-the-pole contests they have landing gear since ROG is required.

The speeds are amazing. The model takes off and the speed timing is done on the second two laps. Since the models are flying on a fifteen foot line if the two laps take 1 second each the model is flying at 64.26 miles per hour! (Yes, we round to two decimal places.) However, the contest is for the total time on however many laps the CD decides.

I will post details on this thread and a thread about the model I build.

KF
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kittyfritters
Posts: 124
Joined: Tue Sep 27, 2016 8:13 pm

Re: Rubber Speed Event

Postby kittyfritters » Sat Dec 22, 2018 2:57 am

Here are the preliminary rules set for the Rubber RTP Speed event.

RUBBER POWERED RTP SPEED EVENT RULES
(Preliminary)

Pole
    The pole will be three feet tall with a headed nail in the top.
    The line will be fine sewing thread with a paper clip at each end as a swivel and a hook. The swivel to hook length, including the paper clips is 10 feet. This gives a circle of 62.83 feet. (1 second lap equals 42.84 mph.)
    A 1/8 inch high, foam, curb is placed across the path of the flying circle at one side as a timing point.
    Three people with stop watches will do the timing unless there is an electronic timing system


Models

    Classes

      Covered motor
        “Plausible scale” (i.e. must have a cockpit)
        Motor completely enclosed by fuselage
        Flying surfaces built up and tissue covered
        Landing gear has rolling wheel(s)
        Detachable dollies allowed
        (If you think you can make that work!)
        Hook attaches at wing tip
      Unlimited
        Motor sticks allowed
        All balsa flying surfaces allowed
        Landing gear has rolling wheel(s)
        Detachable dollies allowed
        (If you think you can make that work!)
        Hook attaches at wing tip

Competition

    For a qualifying flight the model must ROG, from the floor, from any point past the curb and must be airborne and clear the curb at the end of the first lap.
    The timing starts when the model crosses the curb at the end of the first lap. The model is timed for the second and third lap and the speed is calculated.
    Winner in each class is the fastest speed.

These rules are preliminary and will be revised after flight testing and experimentation.
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staubkorb
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Re: Rubber Speed Event

Postby staubkorb » Thu Jan 03, 2019 11:13 am

This should prove to be interesting! I know that the speed class was popular up thru the '50s and Outerzone has a couple of plans IIRC (I know that I have one or two in my collection).
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kittyfritters
Posts: 124
Joined: Tue Sep 27, 2016 8:13 pm

Re: Rubber Speed Event

Postby kittyfritters » Sun Jan 13, 2019 10:06 pm

Here is the preliminary drawing for The Speed Merchant, my Round-The-Pole rubber powered speed model, for the contest at Duarte on February 16th. Before I cut wood I'm considering moving the wing to the bottom of the fuselage. the tether wire will go from the right side of the fuselage, embedded in bottom of the wing about half way between the leading edge and the spar, to the left wing tip where it will have a loop. Will test both two and four blade prop. If other obligations permit I will have both the built up fuselage and rolled tube versions ready for test flying at Duarte on January 19.
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