zee_man

Hi, I am looking for a good performer and lite weight 20" e-prop, for 3D.
Any suggestions ??
Thanks .

zee_man

I would be happy to hear your opinion about carbon vs wooden props ???

Hellcat1st

The best e-lectric props I have found for sport flying are the APC they do make 20+ inch props check them out Most of my e-flight so far has been park foamies And I am know venturing ito a 4o0 size convertion The same zize e-prop compared to glow gives a lot more pull and increased rpms in september 2005 Model airplane News did a 1/4 scale Pitts bipe convertion they used APC prop Hope this Helps some

zee_man

Thanks Hellcat,

From threads written in this forum I understood APC-E are not very good In these sizes, on the other hand many recommended MEJLZIK corbon props. correct me if I'm wrong.
Any other recommendation ? wooden props perhaps ?

thanks again,
Nir.

Greg Covey

Comparing APC e-props to Mejzlik carbon props is like comparing "apples to oranges". Both are fruit but very different from each other.

The 20" APC e-props are just fine for 3D. You can see them [link=http://www.hobby-lobby.com/elecprop.htm]here[/link] at Hobby Lobby for about $15 U.S.

The Mejzlik hollow carbon props are superb designs but also cost $51 U.S. at [link=http://www.desertaircraft.com/page.php?Page=Mejzlik]Desert Aircraft[/link].

So, are you willing to pay an extra $36 before even trying out an APC e-prop based upon something you heard on the Internet?

zee_man

got you Greg, you have a point.
Are the Mejzlik's in the link good for e-power?

Joacim

Comparing Mejzlik Electric props to APCE is like comparing a Lamborghini to a Volvo 740

Mejzlik is makin 20x11 and 20x12" E both standard and wideblade version, best there is for big electric setups!

zee_man

THanks Joacim,
The problemis that the pitch is to nuch for me, what I need is a 20"x8 prop, any of those available in Mejzlik ?
Thanks again.

Joacim

No not yet, but have a look at the RASA E props, carbon copy of APCE.

zee_man

Thanks Joacim,
have you tried them ?
perhaps you have a link with some information or the selection of props ?
Nir.

zee_man

link???

zee_man

Please guys, I have been searching like a mad man but haven't found anything....give me somehting, anything

algutkin

My Feedback: (1)

Zee Man;

I couldn't help but comment, I am very willing to put in one cent worth, but this one cent answer not answer your question.
The truth, and nobody else will tell you, is that there is no perfect answer.

Allot of the E-props flex, that is not good. However, on the other side, they are usually lighter, so they allows more RPMs and more efficient motor operation. This is due to less mass and weight resistance. In my thinking, RPMs are a function of Volts to the electric motor, and amps sustain that voltage, however, it stands to reason that, if the prop is thinner and lighter the motor will not work as hard. I think it make the motor operate more efficiently sby producing the same RPMs and use less amps, thus, less stress on the batteries. However the plane won't fly as well as it would, if it had a larger mass non-flexible prop. As you can imagine, there is alot to consider when selecting motors, controllers, batteries and props.

If you want to take time off of work, or, use up your spare retirement time, you can read every build thread on this site and get info on props. In order to save you the time and effort, the answer that you will come up with, is that there is no perfect answer. Every builder experiments and comes up with his or her own performance conclusion. In other words, the method of finding the right prop is to use suggested variations posted by other people or motor manufacturers, then spend more money and try different props until you find some that work best for your particular type of flying.

So, Zee Man, welcome to the RC research and development department. Also you might embrace my philosophy, "just do it"

Al G.

Joacim

I have tryed the Mejzlik E props alot, many diffrent versions, they are superb!!! i havent found anything better, on my setups and tests they easely outperform a APCE or wood prop.

Mejzlik now have the props on there site http://mejzlikmodellbau.inshop.cz/inshop/

They are working on more sizes planning both bigger (over 26") and smaler ( under 20") props both in E and WE versions.

With todays motors, and coming motors (up to 10+kw) there is a BIG need of these props.

zee_man

Thank, Iguess I will wait to their 20" props.
Nir.

Joacim

Mejzlik is workin hard in developing new sizes for Electric, im helping out with researce in what sizes are needed, props from 18"-30" in both standard and wideblade option, what sizes to you all want and need?

So far here is my result:

18x8
18x10
20x8
20x11
20x12
21x13
22x12
24x12
26x12
26x15
27x13
28x12
30x10
30x12


Maby also 30x16 and 28x14.

zee_man

I personally need 20x8, by your recommendations for the ST, where can I find it ?
Thanks again.

Joacim

There is no Mejzlik 20x8 avalibul yet, but there is many asking for 20x8 and 18x8 sizes. serch for the Rasa, there are carbon copys of APCE.

Mike Parsons

19x12 wide

zee_man

thank's Joacim, as I wrote above, I have been trying to search for RASA props without any results.
Nir.

Joacim

I dont know any outside sweden that has RASA, i know there are some in Germany but cant find adress now.