needing to figure out a ratchet and free spinning fan

[ataripirate]

I am trying to create a hand powered fan. I am not familiar with some of the options that exist with the technic system, I have seen them but never had the chance to use them.

What I am wanting to do is have a lever push in and spring out, ( I believe I will have to rig up a spring) the lever get pushed in and spins a gear, this turns a gear up top with a fan attached to it. as the lever comes back to its starting position, it can not spin the gear backwards, similar to a ratchet, unless there is another way to do it, I have looked at setups like a train piston on the wheels.

at the top, the fan will spin with the gear movement, but continue to spin after the gear has stopped - never used a lego clutch gear, maybe this would work?

working on a rough draft drawing of the design

ask any questions, if I left anything out, just ask

thanks

Bobby

[Blakbird]

The 8232 helicopter has exactly the function you are talking about. Take a look.

[BusterHaus]

Flying a helicopter takes a great deal of coordination. Rather than subject helicopter pilots to complicated aptitude tests, regulatory authorities just make them do sweet dance moves as shown.

I love these objective reviews!

[ataripirate]

thanks, I will look into it

[Gnac]

The old Designer Set 4403 Air Blazers features one of the best implementations of this idea. Although the spinning rotor action is activated by squeezing the helicopter's bum to make a "scissor" assembly push the rack forward, it does have that nifty ratchet:

Not shown: the elastic band on the end of the rack to make it return. When the rack springs back, the 24Z gear (still spinning in the opposite direction from the energy of the rotors) would normally stop it, but it's hinged on an armature which instead causes it to skip.

[JJ2]

This set has that type of mechanism

It works very nicely

Edited September 18, 2015 by JJ2

[roxXx5]

Another set with a similar mechanism is the Lego Creator Set 31011.

There you can move the backwheel of the landing gear back and forth to spin the prop of the airplane.

[ataripirate]

thanks for all the ideas, keep them coming if you have any more. looking at the kits to see how they work

[ataripirate]

is there a place to get the parts break down on the sets? like the 8232 helicopter, or the manuals the best place?

thanks

[Jay Psi]

is there a place to get the parts break down on the sets? like the 8232 helicopter, or the manuals the best place?

thanks

Bricklink is usually good for set inventories. Here's the part list for 8232, for instance.

As for instructions, Lego has most of them online, and I've not had to look elsewhere for them.

[ataripirate]

thanks

[jono rocky]

G'day. Are you thinking on the lines of something like this. I havnt finished the instructions yet, they are about 70% done.

[ataripirate]

yes exactly thanks will be interested in the instructions

Edited September 28, 2015 by ataripirate

[ataripirate]

jono.rocky - would you happen to have the build plans for the trigger and propeller? thanks