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

eightyknots

By eightyknots
in Engines and Props

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APenNameAndThatA Well-known member

APenNameAndThatA

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On 10/09/2021 at 11:24 AM, facthunter said:

 Maybe to the OFF topic section for your Humour. It's certainly got nothing to do with the thread topic. Nev

As far as I can tell, it is not possible to post to the off topic forum. Besides, I enjoy the off topic comments. 

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Kyle Communications
Kyle Communications

Another very happy customer      

Blueadventures
Blueadventures

Did another hour today; 2nd session and third flight with the E-Prop.  Pitched decreased to 24.5* from 25*.  Turbulent air so had to get above 3,500ft for smooth air.   Happy with results.  WOT s&

JG3
JG3

Gday, Finally the results of testing the EProp in comparison to Bolly and Kool (Luga), using manifold pressure to set engine power exactly equal for each. Once again surprising results that

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eightyknots Well-known member

eightyknots

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On 16/09/2021 at 3:07 PM, Garfly said:

Savannahs of Sardinia  - some with floats and E-props:

 

 

It is great to hear the real-world experience of this Savannah owner. He said that he was so "satisfied" with the E-props that he decided not to change out the engine for a more powerful one.

 

Thanks for sharing.

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Garfly Well-known member

Garfly

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And now for the E-Legs ?? 😉

Claimed to be something like half the weight and 4 times the strength of aluminium equivalent.

(vid in French - rough auto translation available in YT.)

 

 

 

 

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Bernie Well-known member

Bernie

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20 hours ago, Garfly said:

And now for the E-Legs ?? 😉

Claimed to be something like half the weight and 4 times the strength of aluminium equivalent.

(vid in French - rough auto translation available in YT.)

 

 

 

 

I couldn't understand him, was he talking metric

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Bruce Tuncks Well-known member

Bruce Tuncks

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The weight savings convince me. At the same efficiency, there is a big win for our type of plane with a 4kg weight saving.

If you also changed to a LiFe battery and the e-prop landing gear, you may be able to save 15kg total. Wow, that would transform many planes. Bugger it, I need to lose weight too.

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Garfly Well-known member

Garfly

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If I understand the claims made in the video, these legs are four to five times tougher than aluminium ones. So, on the face of it, I guess they'd be way over-spec even for the new 600Kg version.

 

We'll have to wait and see, even whether they are offering Ranger/Nynja legs. 

 

In any case, another interesting development in the more strength for less weight carbon fibre stakes.

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Garfly Well-known member

Garfly

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In the video the chap says that their first models are for the Super Guépard (another French design - see pic - very similar to the Skyranger) but that legs for others will follow. 

 

 

 

344623877_SuperGuepard.thumb.png.3ca49c63e9d0fa27e403d2f64ce881e8.png

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Kyle Communications Well-known member

Kyle Communications

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I have asked the question of Eprop and suggested some models and if they are going to make them..Skyranger/Ninja/jabiru/ Savannah ....will see what comes back

Will see what comes back as well as I have asked about any further info on the Jab prop

 

Busy week this week...3 props ordered and one of them is the CSU (Glorious) one

 

 

 

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Kyle Communications Well-known member

Kyle Communications

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Eprop is such a great company to deal with...always get back to me almost any day of the week.

 

Ok they are very satisfied with the new Jabiru prop.

The issue is they just do not have enough space at the current factory to keep doing what they are doing. You may have seen some posts where they are currently building a huge new factory. They are pushed to the limits with orders and space

So the upshot of this is until they get the new factory up and running they wont be producing the new jab prop or any of the undercarriages because they just dont have the physical room to store all the molds and for the new machinery they have designed and built to make them all.

They should have this operation by "spring"  so for them thats early in the new year.

 

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meglin Well-known member

meglin

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It may seem strange to someone, but for a spring, it is not weight and strength that are important, but the ability to bend and the ability to absorb energy. Therefore, I do not understand the excessive strength of the spring. It is important for me to know first of all the course of the spring. We produce our own fiberglass springs for our aircraft. Why fiberglass? Because it has a lower elastic modulus, it is more flexible. The operating stroke of the spring is 200+ / -20 mm. This allows you to significantly reduce the overload during landing.

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Garfly Well-known member

Garfly

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If you watch the video, the E-Prop man does not only (or mainly) use the word 'strength'.  That was my own rough (non-technical) short-hand.

 

Here is the translation provided in the YouTube video description:

 

"  E-PROPS works daily to propose solutions for a lighter and more efficient aviation. In this fight against useless masses, here is the new Composite Landing Gears for ultralight aircraft. The landing gear (the two composite legs) weighs 2 kg. Mass saving compared to metallic landing gear = 5.4 kg. The E-PROPS composite landing gear legs offer : - 4 times more max. deformation - 6 times more energy max. absorbed than the existing landing gear legs. E-PROPS composite landings gears : weight saving, mechanical strength gain, better damping. Info here :

https://aircraft.e-props.fr/trains.php   "

 

 

 

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Garfly Well-known member

Garfly

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18 minutes ago, Thruster88 said:

A spring cannot absorb energy or am I missing something.  

 

I don't think anyone's saying that Thruster.  It's just that I (mis)used words like 'strength' and 'tougher' to describe what the video was claiming for the new legs when, to be precise, 'max. deformation' and 'energy absorbed' are, as meglin points out, more relevant measures (and what's actually claimed in the vid.)

 

(Or maybe I'm missing something.   ;- )

 

 

 

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facthunter Well-known member

facthunter

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The "DAMPING" aspect needs to be explained. The effect might be something to do with the natural harmonics  of lighter material. Damping needs friction and that needs elements moving against  each other. It takes force to deform a spring but it returns it when  that force reduces.  That's why undamped legs can make you bounce so well. A properly damped undercarriage is far easier to land with as it removes some of the energy Nev

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