Hi Thingiverse,

here is my Jet Turbine Project.
This is a hand operated high revolution compressor turbine blowing through a chopper ring thus generating pressure waves..

The design consists of a Modular High Ratio Step Up Transmission and a Fan/Chopper Stage.

My own challenge for this project is to get the biggest Step Up Transmission Ratio as possible!

The key to success is all about friction, strength and balance:

• lower friction -> higher possible StepUpRatio -> higher rpm
• get the tolerances right (gear play)
• strength to withstand high input torque to overcome all the friction.
• strong muscles, good grip
• well balanced turbine and drive shaft to avoid extreme wobble (more friction), wear, damage or even total failure from high rpm

PreReleaseV03 Prototype:
https://youtu.be/3Hs_fZ92kS8

Update 20151206 V05:

Uploaded AddStageV05 with Ratio i=4.71 and i=5.57 and corresponding Carriers

You can stack..
MainStage4.71 + MainStageCarrier4.71
AddStage5.57 + AddStageCarrier5.57
AddStage4.71 + Handle4.71
..or..
MainStage4.71 + MainStageCarrier4.71
AddStage4.71 + AddStageCarrier4.71
AddStage4.71 + Handle4.71

4.71x5.57x4.71 works but is much harder to turn. I think I reach higher rpm with 4.71x4.71x4.71 or maybe I'm just not strong enough. I will test more and measure over the holidays. V05 Stages are compatible with previous V04 prints as long as you use the corresponding V04 carrier/handle.

Update 20151103 V04:

uploaded new V04 Files:

• Adjusted tolerance of gearing
• Ratio of Main and Additional Stages still is i=4.71:
  (zR = -52; zS = 14; zP = 19; mn=1.1mm; Gear Play = 0.40mm)
• Connector size increased from Hex 12mm to Hex 18mm for higher strength (mainly for the first stage)
• Floating rotary joint for turbine tip to reduce wobble
• counter Thumb-lever on handle for better grip/higher torque input on startup

I haven’t fully printed this release yet so it’s not verified. Tolerance of the gearing works for me but my printer isn't as accurate as I'd like it to be. Gear play is 0.40mm. Fit is on the tight side for me.. Any reference values/guidelines from experts that works for most of you all are greatly appreciated. I can export and upload files with these values if needed.

Up Next::
Print and verify this Release V04.

I am also planning on doing Stages with other Ratios:

• i=4.4
• i=4.15
• i=3.78
• i=3.6
• i=???
  Some math to do first..

Further I want to export only the bayonet lock sections for you to design other attachments for the Main Stage/StepUp Transmission. Fast rotating stuff is always fun. Wondering what you all will come up with. Or in high StepDown configuartion for high torque output applications..

I also need to create a setup to measure the frequency to be able to calculate the max rpm of the turbine..

..so stay tuned