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Speed Merchant - RTP Rubber Speed Model (Read 179 times)
Reply #11 - Jan 25th, 2019 at 6:46pm

Sky9pilot   Offline
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Very interesting Howard...I look forward to your next model.  Thanks for sharing the video!
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #10 - Jan 24th, 2019 at 3:24pm

Kittyfritters   Offline
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California

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Here's a video of my test hack at OFFC Wednesday morning. Couldn't get it over 13.5mph at Duarte last Saturday, Changed to a smaller prop and cut the wings back down, in stages, to the original span and got a 24.43 mph flight out of it, probably the limit for that airframe, The vid was taken at the end of the session when the rubber was getting tired. It's only doing 16.34 mph in the video, Has too much incidence, jumps off the ground too soon and flies too high, but I think it give me the parameters for my real racer. Oddly enough, I think a scale D-12 Bonzo would do quite well.
https://www.youtube.com/watch?v=1MoqCCBgFmc

More Later!

KF
 

Qua sublata omnia praecepta legis
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Reply #9 - Jan 14th, 2019 at 10:36pm

bigrip74   Offline
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Austin, Texas

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No rush KF, I was wanting to see this in action.

Bob
 

IF IT AINT BROKE DONT FIX IT!
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Reply #8 - Jan 14th, 2019 at 10:17pm

Kittyfritters   Offline
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Stick & Tissue
California

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bigrip74 wrote on Jan 14th, 2019 at 8:48pm:
kf, interesting rules. I assume some photos will be posted of the attempts to help us?

Bob


With videos if I can get good ones.

KF
 

Qua sublata omnia praecepta legis
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Reply #7 - Jan 14th, 2019 at 8:48pm

bigrip74   Offline
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What did l do this time!
Austin, Texas

Posts: 5569
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kf, interesting rules. I assume some photos will be posted of the attempts to help us?

Bob
 

IF IT AINT BROKE DONT FIX IT!
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Reply #6 - Jan 14th, 2019 at 6:58pm

Kittyfritters   Offline
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California

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Sky9pilot wrote on Jan 14th, 2019 at 4:24pm:
Interesting model...and category.  I think it kinda reflects the FAC B.L.U.R. (Bee Line Unlimited Race ) You can see the rules on page 17 of the FAC Rules Book  Click Here

Looks like a lot of fun...please keep us informed!!! Smiley


The B.L.U.R. race is for scale models.  (And when I have seen it was fun to watch.)  The RTP race is for pure speed models.  The Covered Motor  class simply has to have a canopy, that's for "plausible scale".  The Unlimited Class can be a motor stick model.  Push/Pull designs have been suggested but they must R.O.G.

The Speed Merchant is a similar model to the Comet Racer, and other speed models of the 1930s, with a 9 inch wing span and is 22 inches long.  The difference is that is intended to be tethered at the wing tip to fly in a circle.  This is something the Black Sheep Squadron did many years ago and it was decided that it would be interesting to revive the contest.  I might also be fun to fly these things outdoors on a B.L.U.R. course.

Here are the rules:

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.

KF


 

Qua sublata omnia praecepta legis
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Reply #5 - Jan 14th, 2019 at 4:24pm

Sky9pilot   Offline
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Stick & Tissue
Kelso, WA 98626 USA

Posts: 10223
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Interesting model...and category.  I think it kinda reflects the FAC B.L.U.R. (Bee Line Unlimited Race ) You can see the rules on page 17 of the FAC Rules Book  Click Here

Looks like a lot of fun...please keep us informed!!! Smiley
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #4 - Jan 14th, 2019 at 2:18pm

bigrip74   Offline
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What did l do this time!
Austin, Texas

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Ian, I have that plan, but never found anyone to be a mentor to build one and as strat-o stated what are the rules.

Bob
 

IF IT AINT BROKE DONT FIX IT!
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Reply #3 - Jan 14th, 2019 at 10:14am

pb_guy   Offline
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So I'm just a kid at heart.
Youbou, BC, Vancouver Island

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Speed models have a long history it seems. The Comet Racer by Don Orman had a 9" wingspan and appeared in the August 1938 issue of Air Trails. Speed models might raise the interest of some of the younger generation.
Quote:
Models of this design have been clocked at 91.4 miles per hour over a 120-foot course. A second model with slight modifications turned in a speed of 96 mph. It averaged 80 mph for seven flights over the course

Model on Outerzone: https://outerzone.co.uk/plan_details.asp?ID=9859
ian
 

comet_racer.jpg (44 KB | 2 )
comet_racer.jpg
comet_racer2.jpg (61 KB | 3 )
comet_racer2.jpg
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Reply #2 - Jan 14th, 2019 at 9:26am

strat-o   Offline
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Interesting.  What are the rules?  Could you make the rolled-tube version push-pull?
 
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Reply #1 - Jan 14th, 2019 at 8:33am

bigrip74   Offline
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What did l do this time!
Austin, Texas

Posts: 5569
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kf, what is the wing span?

Bob
 

IF IT AINT BROKE DONT FIX IT!
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Jan 13th, 2019 at 3:59pm

Kittyfritters   Offline
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California

Posts: 565
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OK, so this is not quite free since it flies around a pole but it still fits here.

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.
 

Qua sublata omnia praecepta legis
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