Stingray Build

[greenman407]

It looks like an F-86 Sabre........to start with.

[RCnut]

Your fault! You keep shoving this candy in our faces, then act surprised when we eat it up.

David

Weeeeeell, Not that surprised lol.

[RCnut]

I was more thinking about it switching on and off rather than speeding up or down, I think it would look silly stopped but still beating it's tail, but hey it sounds cool to me.

I know which sub David is thinking about, it could well be this one:

[ATTACH=CONFIG]14866[/ATTACH]

Thats the one, Based on an X5 experimental plane.

[Subculture]

That's even simpler. The elephant in the room is how you're going keep this thing going in a straight line. If you use flapping tail propulsion, it will be slow, if you use propulsors mixed with a flapping tail for effect, you have a huge rudder wiggling left and right. Drunken terror fish, anyone?

[Captain Scifi]

To speed up and slow down the tail? Yes that's possible, adds some slight complication to the code, as you will have to speed control the servo, but it's definitely doable.

Simpler if you divide the throttle response into a few discrete stages, e.g. half a dozen steps- you won't notice the difference from full proportional control.

I was more thinking about it switching on and off rather than speeding up or down, I think it would look silly stopped but still beating it's tail, but hey it sounds cool to me.

I know which sub David is thinking about, it could well be this one:

[alad61]

Now that is cool. An rc terror fish to chase the Stingray!!! I love it.:)

[He Who Shall Not Be Named]

Im gona post some pics of my Stingray and get this thread back lol. Should have kept my mouth shut lol.

Your fault! You keep shoving this candy in our faces, then act surprised when we eat it up.

David

[Subculture]

Could you link this to the speed controller?

To speed up and slow down the tail? Yes that's possible, adds some slight complication to the code, as you will have to speed control the servo, but it's definitely doable.

Simpler if you divide the throttle response into a few discrete stages, e.g. half a dozen steps- you won't notice the difference from full proportional control.

[RCnut]

Im gona post some pics of my Stingray and get this thread back lol. Should have kept my mouth shut lol.

[Captain Scifi]

Could you link this to the speed controller?

[Subculture]

Would be easier to use a servo hooked up to a picaxe microcontroller, programmed to shuttle back and forth.

[Captain Scifi]

It does wave it's tail but it's all for effect not really for locomotion. This did get me thinking however that a good swimming effect could be made with just the water flow over the model, it may mean a few compromises like changing the tail from a rigid material to soft flexible film or fabric. I am thinking for the motion that a limit switch or lever could be used to tilt the tail (rudder style) from a little port to a little starboard attitude, you wouldn't need much just enough to send it in the opposite direction. I'll try to find a few minutes to draw what I mean but it would be based on a clock ratchet armature where the water flow would over the tail would stand in for the pendulum or balance wheel and the rocker would alter the tail pitch to change it's direction. If the motion was left to cycle it would go first to one side then at the limit of travel actuate the angle of the fin to travel to the opposite side. I think this would capture the motion of the screen used model quite elegantly.

Alternatively, the tail is just the rudder and I am completely bonkers.

[He Who Shall Not Be Named]

You're going to end up with a skipjack inserted where you get to blow ballast if Ellie reads this!

Weight shifiting is an option if the fish is fairly slow. I'd have thought tiltable twin jets, with steering in a tank style would be best for this. IIRC, the Terror fish didn't flap its tail for propulsion.

LOL. Indeed! Today's mission to to keep her away from the monitor as I pull up this thread!

Good catch, Andy. I assumed (you know how that word breaks down!) it flapped its tail. Wrong! I should shut-up till we see how this thing matures as a master.

David

[Subculture]

You're going to end up with a skipjack inserted where you get to blow ballast if Ellie reads this!

Weight shifiting is an option if the fish is fairly slow. I'd have thought tiltable twin jets, with steering in a tank style would be best for this. IIRC, the Terror fish didn't flap its tail for propulsion.

[He Who Shall Not Be Named]

A female type Model Builder!? (thank God, by the way, the word 'partner' today goes down like razor wire ... you never know the context).

I've only seen two gal's worth a damn at the Craft in my life. No, Ellie is not one of them: in the shop she's a production drone (glass work and casting duties). That is, when she's not busy cutting finger-tips off on the table-saw or slinging molten white-metal around the shop... there's something about her and spin-casting that just does not gel. Eleanor's otherwise the MK-1, Mode-0 House Wife: she attends to the household domestic duties, keeps me in coffee, screens my incoming calls, and chases out the occasional home-invader. A tough old bird.



I'm not the Politically Correct type, so I was going to give that piece of news (the work of your Partner) a very wide berth. Thanks for the clarification. It does matter!

Now that fish vehicle (X-20's ride) is a project! Love the mottling effect at the front. Details! OK, propulsion and steering is obvious. How are we gonna control this thing in pitch?

(watch Andy jump in with the very European, shifting-the-battery-weight option).

David