Video 4 of 4. Test Number Three-3D Printed Hamilton Standard 11x6 propeller on thrust test stand.

This is the third thrust test of a new 3D printed propeller. This also is a completely new and untried model of the Hamilton Standard propeller. The airfoil is under-cambered with the scale outline of blades used on the Douglas A-20 Havoc. The scale is 1/12 with a diameter of 11.38 inches and a six inch pitch angle. The thrust test for this propeller was the most impressive of all four tests.
The thrust testing is the first stage toward testing these propellers in flight. A trainer plane will be used for the flight testing, one that was built for and flown with the motor/propeller combination used as a control in the first test. The same motor and speed controller will be used for all 3D printed propeller tests.
The measuring device for thrust is a School Supply Company Spring Scale, commonly known as a fish scale. The track is 8mm steel rod with the carriage mounted on four LM8UU linear bearings.
Here is a summary of all four tests:
Test Number-1, Master Airscrew 11x6 electric propeller.
Performance:
1/4 throttle, 4 ounces of thrust.
1/2 throttle, 9 ounces of thrust.
3/4 throttle, 22 ounces of thrust.
Full throttle, 42 ounces of thrust.
Test Number-2, Hamilton Standard 3-blade propeller, 1/12 scale, 11.38x6 for A-20 Havoc.
Semi-symmetrical airfoil.
Performance:
1/4 throttle, 4 ounces of thrust.
1/2 throttle, 8.5 ounces of thrust.
3/4 throttle, 19 ounces of thrust.
Full throttle, 39 ounces of thrust.
Test Number-3, Hamilton Standard 3-blade propeller, 11.87x4 for Tower Hobbies F6F Hellcat.
Under-cambered airfoil.
Performance:
1/4 throttle, 6 ounces of thrust.
1/2 throttle, 14 ounces of thrust.
3/4 throttle, 21 ounces of thrust.
Full throttle, -------------Null------------.
Test Number-4, Hamilton Standard 3-blade propeller, 1/12 scale, 11.38x6 for A-20 Havoc.
Under-cambered airfoil.
Performance:
1/4 throttle, 8 ounces of thrust.
1/2 throttle, 21 ounces of thrust.
3/4 throttle, 32 ounces of thrust.
Full throttle, 49 ounces of thrust.

[@glennboyd939]

Get your print to stop for a colour change half way, and lay a loose sheet of carbon fibre on the print, then keep printing.

[@tejdz1337]

not surprised this works but still impressive. i myself have made alot of EDF impellers and ran them on a 2.2kw motor. i think my thrust record was like 2.1kg at 1200 watts.

[@coolmodelguy6304]

I am rather surprised at the results, but this was also just a bench test for a very limited duration. Flight test are next and I need to rig some video to record, though I am more worried about hitting a rock and chipping a blade on takeoff than anything else. I like the idea of 3D printed EDF impellers, sounds interesting!

[@S-RobotLabo]

That's an amazing technique! I'm impressed!😄 I would also like you to see the robots I made.😄

[@coolmodelguy6304]

Thank you, and I will check out your robots. Very interested!

[@daviddavids2884]

have you ever tried reversing the motor shaft. doing so would, among other things, reduce the distance that the prop hangs out in space.

[@pinoyrcmaker72]

Wooow super cool 👍 done subscribes bro

[@coolmodelguy6304]

Thank you so much 👍

[@mohammedaghazy6161]

how did you make this thrust stand, give me all info. please

[@coolmodelguy6304]

The rails are 8mm steel rod. The carriage rides on four LM8UU linear bearings (Amazon- uxcell SCS8UU Linear Ball Bearing Slide Block Units, 8mm Bore Dia, Pack of 4). A rubber band is stretched across the rails to keep the carriage from backing up too far (I did not want to cut the rods down, in case I needed them for something else), held in place by screw in hooks attached to the wood frame. A spring scale, what I know as a fish scale, attaches to the back of the carriage and the rear wood block on the frame.

[@okyereebenezer1828]

😊

[@user-ml5pm8es1t]

Bjr mous vous lon une version française Pour communiquer

[@vesh555]

You don't deserve it I like your videos