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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion Docs  Sport mechanics in scale helis
01-08-2016 04:55 PM  4 years ago
Heli143

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Phenix City, Alabama

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that S-58 start with the sounds and puff of smoke is awesome!!

that is one of the coolest scale helicopters I have seen

thanks for sharing!
Roy Mayoral
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01-10-2016 10:36 PM  4 years ago
CopterDr

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West Plains, MO

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Thanks for the pics Bob...most appreciated.

I agree Heli143....been my favorite radial powered ship period.
To fly is Heavenly, to hover is divine!
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01-17-2016 04:32 PM  4 years ago
seahorse bob

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Arvada CO

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My latest modification to the Cobra head is eliminating the "control posts" as Thunder Tiger calls them. I had originally used them to enhance the scale appearance but since the full scale control rods are on the trailing edge of the rotor, it really wasn't very scale anyway. Additionally, since the posts were so long, there was a slight bending moment on the grips and I could get rid of it by having the rods going directly to the grips.
I took trig about 55 years ago, but if I'm calculating it correctly, there should be a slight reduction of response doing this. Since the rods tilt at about a 16 degree angle, which has a cosine of .96, there should be about a 4% change. I can't really detect any change in flying but it still flies very well.
Let me know of any questions or comments.
Bob

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01-17-2016 05:40 PM  4 years ago
CopterDr

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West Plains, MO

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Thanks awesome Bob......can't wait to see it in action.To fly is Heavenly, to hover is divine!
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01-19-2016 03:39 PM  4 years ago
seahorse bob

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Arvada CO

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Thanks, Barry

Bob
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06-15-2016 12:07 AM  3 years ago
seahorse bob

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Arvada CO

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Here are a few pics of the Cobra in flight. Thanks to Eric for taking these.

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06-15-2016 12:14 AM  3 years ago
seahorse bob

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Arvada CO

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I have several interests in modeling and I thought I'd show one that's been very interesting to me lately. These are all 1/6 scale. I've been running some rock crawlers and this one is based on the G.I. Joe model from about 15 years ago. The original version is on the right and the modified for crawling version on the left. I have an indoor venue near me called "the crawl space" and it's great fun in the winter with no weather worries.

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06-20-2016 03:19 AM  3 years ago
Billybezeau

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Mirabel,Quebec, Canada

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Hello,

what about the tailboom section of the mechanic? how to you mount in it and keep it away from moving in their. and on the strengh side, since their is no rods how would you get that stronger!?

thank you
Billy
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06-21-2016 03:34 PM  3 years ago
seahorse bob

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Arvada CO

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Bonjour,
If I understand your question correctly, the torque tube drive for the tail rotor forms a "spine" and provides strength for the assembly. In addition, the fiberglass fuselage also provides strength. There is some foam rubber in two locations between the fuselage and tube to separate them and prevent vibration, interference,etc.
Let me know if I answered your question and feel free to inquire further.
Bob
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06-22-2016 03:55 AM  3 years ago
Billybezeau

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Mirabel,Quebec, Canada

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That answer my question pretty well!! You understood my crooked english hehe!!

Because in my mind, where the tail rotor shaft gets out the fuselage it could possibly vibrate and wear out there. I hope you understand what I am trying to explain theire haha

Would it be possible to get some pictures of thoses piece of rubber in place, which reduces vibrations?

Best regards
Billy
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06-22-2016 04:50 PM  3 years ago
seahorse bob

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Arvada CO

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Hi Billy,
The pieces are fairly well hidden in the Cobra and I don't plan on seeing them until their next maintenance is required - or after a crash! So, instead of that, I'm posting some pics of another project of mine that will show the concept. Although the location isn't in the tail boom, it shows the same function. I used some dense foam that was packed with a Scorpion motor. Let me know if this answers your question.
Bob

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06-23-2016 01:42 AM  3 years ago
Billybezeau

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Mirabel,Quebec, Canada

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Yes sir, pretty well!

Thank you
Billy
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion Docs  Sport mechanics in scale helis
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