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Old Dec 24, 2012, 05:27 AM
I am actually really slow
SlowBarless's Avatar
Brisbane
Joined Jun 2008
959 Posts
Possibly ambitious Christmas Project

This photo reveals alot of details

All I can say is...
1. Sawtooths
2. 9-10" diameter
3. It might take a while



2013 is going to be a good year!
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Old Jan 01, 2013, 09:55 AM
Registered User
North vancouver, B.C. Canada
Joined Apr 2008
18,474 Posts
Quote:
Originally Posted by M. Koch View Post
Hi Andres!
My props are tested up to 35.000 rpm on the smaller ones! The bigger ones are tested to about 20.000-22.000 rpm which consumes the 8-12kW we fly at the moment in our speeders!
A lot more props come soon! Im hardly working on them !

Ciao, Marcus
I get some props from you
And they are best quality I have seen

Thank you

I test 7x13 and others you send me

My plane for sure goes faster now


You make serious high quality folders

I want to order soon larger props as 8x23 is not as large as I thought
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Old Jan 10, 2013, 08:42 AM
I am actually really slow
SlowBarless's Avatar
Brisbane
Joined Jun 2008
959 Posts
Took some photos of my recent sawtooth adventures. Nothing beats staying up till 1am getting covered in carbon dust But there's plenty of these blades out and about now and Im working on new layups composed almost entirely of 'Material X' Things are looking promising


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Old Jan 11, 2013, 04:02 AM
2012 NZ Speedcup - 231 MPH
DownUnderPilot's Avatar
New Zealand, Tasman, Richmond
Joined Mar 2006
1,957 Posts
Dude those props look amazing, well done!
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Old Jan 11, 2013, 05:50 AM
Life-abstract=conformity
S.F. Bay Area
Joined Aug 2002
1,871 Posts
Excuse me buttin in fellas,
Is it just me or would 8 of those sawtooths on an e-Alpina be the schnizzle (I think I just made that up) ?
Forgive me for saying so but I don't think I would care what the performance/efficiency would be.
I'd like to just hear it.And see it.
And show my friends. And scare the Hell out of 'em .
And strike fear into the pants of homeland security , (hmm,I could rethink that last one. Possibly).
Seriously fabulous work gentlemen. Thank you for sharing.
Skies
J
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Old Jan 11, 2013, 07:48 AM
Aka: Tom Jenkins
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Palm Beach County, Fl.
Joined Aug 2008
4,421 Posts
Say, which way does the pitch go if you change from a 40mm yoke to a 48mm yoke?
Also I have a 4035 that I've winded and now modding, I'm not exactly sure what size yoke it needs, The flat is a fuzz over 39mm on the bell so a 38mm spinner, then tweak the bell to match? Also I'm sure the experienced could make an accurate suggestion and guide me in the correct direction. My design is now 1.44m span, 515sqin good for 5.55lbs auw(75gr/DM2). I'm leaning toward 11s or 12s. I need a suggestion for prop diameter as the 4035 is quite powerful now and the torque is there for at least 18k under load, so is it gonna be 8", 9" or 10" diameter? I ain't broke yet but not wealthy either! lol
Tom
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Old Jan 11, 2013, 09:06 AM
Registered User
North vancouver, B.C. Canada
Joined Apr 2008
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Any motor suggestions for these props

Like 8x23
7x13 etc

I think I need a high rpm one ones I have tested are too small or too low rpm rated
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Old Jan 11, 2013, 11:28 AM
Carbon fiber is our friend
Steve C's Avatar
United States, CA, Lodi
Joined Feb 2001
4,208 Posts
Quote:
Originally Posted by ApexAero View Post
Say, which way does the pitch go if you change from a 40mm yoke to a 48mm yoke?
Tom
Pitch goes up if you move the blade out.

David, it depends on how many cells and amps you want to end up with. Do like I do and just collect a lot of motors so you always have one that will work.
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Old Jan 11, 2013, 08:30 PM
Registered User
North vancouver, B.C. Canada
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Quote:
Originally Posted by Steve C View Post
Pitch goes up if you move the blade out.

David, it depends on how many cells and amps you want to end up with. Do like I do and just collect a lot of motors so you always have one that will work.
I want combo that works well with props I mention

So I guess esc spec is also important
But figure at most 125 amps

4 cell battery is good enough

I burned out motor the other day because of too high Rpm
The motor got too hot and was only 700 kv and 4 cell
I look for help with combo for fast efficient set up with 8.5x23

Now I got these props I think I run into situation that my motors are not designed for theses fast props

8.5x23 sounded large but would kill
Some of my motors that I thought could handle them
There is no way my absolute or enigma could handle 8x23
I make mistake in thinking 8x23 was large prop

My 13x9 from soaring USA works much more efficient as example
In my experimental ez glider to test out props with Claris motor and 60 amp esc

I think I need good recommendation for fast motor with these prop choice
As they seem to need high kv

Does anyone know what a great combo of motor and esc is with a 8.5x23
I have no idea
Please help
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Old Jan 12, 2013, 12:03 AM
Carbon fiber is our friend
Steve C's Avatar
United States, CA, Lodi
Joined Feb 2001
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What kind of plane are you putting these props on? It's not a hotliner is it? You mentioned a 13x9 which is normally something you'd put on a motor glider.

BTW, motors rarely go bad from too high rpm. It's too much heat from overloading that kills them. What kind of motor was it that you burned up? Was it a direct drive inrunner?

If you don't have much room, then a scorpion 3026 880 might work with the 8.5x23. If you have more room, use a bigger motor. I'm running a 4020 1100 with a similar prop on 4s and soon 5s.

For the 7x13 you need a much higher rpm motor or more volts. For 4s, a kv of around 1600 should do it. You could use a Neu 1515/2.5D or Scorpion 3226/1600.

Try this. I use it a lot to find viable combos. -- http://www.ecalc.ch/motorcalc_e.htm?castle

...but if you tell us what kind of plane it's going in that would help a lot.
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Last edited by Steve C; Jan 12, 2013 at 10:34 AM.
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Old Jan 12, 2013, 07:03 AM
Registered User
North vancouver, B.C. Canada
Joined Apr 2008
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I wanted to put the fast props on my absolute and enigma that soaring USA sold me
With typical motor they sell in those planes

I forget the motor which is usually put in those planes

It's the common nue motor 1509 or something like that

I wanted to fly them not with throttle on switch but on the throttle stick
With fast continuous prop.

I tested the props on my ex glider with Cularis multiplex motor and 60 amp esc

Motor came down hot and was burned out but esc was good still

Cularis motor is only 700 kv and was 4 cell set up

I will find out motors in absolute and enigma and hope to find proper prop that is fast and works with that motor and 125 esc


Edit it's this motor with 125 esc both in absolute and enigma

http://www.soaringusa.com/NEU-Motor-....5D-6.7-1.html

Any suggestions on which size prop that is good for continuous fast flight

Or is that motor not at all good choice with these type of props
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Last edited by David22; Jan 12, 2013 at 07:19 AM.
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Old Jan 12, 2013, 10:15 AM
I am actually really slow
SlowBarless's Avatar
Brisbane
Joined Jun 2008
959 Posts
I forgot the proper pics Sometimes I enjoy taking photos. The first photo is of my very first few props (only 5 months ago now) I am quite proud considering how far ive come in such a short time. I've done over 400 props since August, mind you some of them were duds or experiments because I was still learning (and I still am ) Ofcourse I wouldnt be here without all the help ive gotten off this forum. Thanks again guys.






Sorry for interupting David, feel free to continue That said though Im pretty sure you could find a nice setup with a 1512 motor. I have run numbers through ecalc before with a direct drive 1512 spinning an 8" prop (Probably the size id be looking at for an enigma) and the efficiency numbers it spat out wernt great but still acceptable. Maybe look at the larger 1710 motors or outrunners.
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Old Jan 12, 2013, 07:13 PM
KC Racing Team
Allan S's Avatar
Melbourne, Australia
Joined Aug 2008
149 Posts
SlowBarless,
Would it be possible to also add suitable spinners and hubs to the prop list.
Regards, Allan.
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Old Jan 12, 2013, 10:33 PM
2012 NZ Speedcup - 231 MPH
DownUnderPilot's Avatar
New Zealand, Tasman, Richmond
Joined Mar 2006
1,957 Posts
Also I'm able to produce a 6.25x11 folder (42mm hub), the development of which is totally selfishly driven because it's the size I need to drive my Ninja into 245+ territory!!!

Of course, it will also work well on other planes.... Up to 5KW at least....
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Old Jan 13, 2013, 04:42 AM
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Auckland - New Zealand
Joined Dec 2010
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Quote:
Originally Posted by SlowBarless View Post
I forgot the proper pics Sometimes I enjoy taking photos. The first photo is of my very first few props (only 5 months ago now) I am quite proud considering how far ive come in such a short time. I've done over 400 props since August, mind you some of them were duds or experiments because I was still learning (and I still am ) Ofcourse I wouldnt be here without all the help ive gotten off this forum. Thanks again guys.






Sorry for interupting David, feel free to continue That said though Im pretty sure you could find a nice setup with a 1512 motor. I have run numbers through ecalc before with a direct drive 1512 spinning an 8" prop (Probably the size id be looking at for an enigma) and the efficiency numbers it spat out wernt great but still acceptable. Maybe look at the larger 1710 motors or outrunners.
Great looking props there SlowBarless, what is the biggest size you do for a non folding prop?
Cheers
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