E-Props ...who has first hand experience with these

[AndysAtCoffs]

I agree with you Nev....smoothness introduced through a dynamic balance is just that and nothing more, smoothness contributes to ongoing wellness but if something was unwell to begin with then your simply masking it until the next degradation occurs....and it will

Edited December 11, 2024 by AndysAtCoffs

[Blueadventures]

45 minutes ago, AndysAtCoffs said:

the other issue with an extension shaft is that generally, in the ones I've seen, there are 2 flat plates that are bolted together with the engine/gearbox output flange with 6-8 bolts around the circumference, and the prop at the other end. They are supposed to be made so that the plate on the engine end, and the other are at a perfect 90 degrees to the shaft (and so perfectly in parallel to each other so that when everything is bolted up and you look for run out by spinning the gearbox/engine and measure at the haft as far away from the engine/gearbox as possible you don't see any/very little  which means the surface was at that exact 90 angle all around. If there is any introduced runout because of a manufacturing defect or the uneven bolt tensions have pulled the shaft away from its center position then no matter how good the static balance the shaft at speed will introduce a vibration because its center of mass is no longer in line with the output shaft of the gearbox/engine. If the runout cant be Zero'd with bolt tension variations/adjustments, then a dynamic balance can help counter the vibration but to me that's a bit lipstick on a pig..... swap out the pig....

 

At least thats what Id do....YMMV

The engine prop setup to look at with your device / method would be the Savannah S as they have a very long spacer between the engine flange and the prop hub.

[Kyle Communications]

Eprop balance the whole assembly inc the spacer no matter what length at the factory before delivery and each part is marked so it goes together exactly how it should be. All customers report that they have never flown behind a prop that is so smooth and finely balanced. I suspect that they use a 2 plane balancer at the factory because the balance of every prop is outstanding. There are balancing weights inside the spacer and also the spinner

 

[Garfly]

 

 

[Blueadventures]

For info I have recently purchased this adaptor tool for torquing the prop hub to flange nuts used for Eprops and some other propeller brands that are not attached using the usual drive lugs on the Rotax flanges.  Will be handy. Just need to do calculation for reduced Nm setting. 

[rgmwa]

If you attach the adaptor at right angles to the torque wrench there is no need to adjust the recommended torque.

[facthunter]

Check your torque wrench frequently. Any over-torqued bolt or stud must be replaced. .  Nev

Edited February 27 by facthunter

[magishme]

Who are importers/suppliers for Eprops in Australia?

[Garfly]

You could PM Kyle Communications on this site for more info.

[Kyle Communications]

Eprop are doing special design work to complete their project for making their incredible propellors. They are doing 2 blade full carbon props for all aviation engines other than Rotax.

Here is a email I got from Anne at Eprop who is the boss.

Let me know if you have any parts that can be used for this scanning and I can organise getting them to France. The upshot would be a far better prop for your Jab and I am sure we could come with a special deal for anyone willing to help with getting these parts

 

Hello Mark,

Since you're from the land of Jabiru engines, let me ask you this.
Do you know anyone who would give away out of order Jabiru 2.2 and 3.3 parts? What we are interested in : out of order crankshaft, connecting rod and piston.
We'll pay for shipping from Australia to France, of course.
In Europe, there are very few Jabiru engines.

These parts can differ according to the models (and sub-models) of each type of engine, and these differences influence the resonances generated and the consequences on the propellers.
The aim is to scan the parts and integrate this data into our LUKY software

For the various Lycoming and Continental versions, we found parts in Europe. 
An Italian mechanic has offered us 3 engines just because he appreciates our work and research - which is cool !

Thank you !