SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Dec 03, 2012, 06:39 PM
Registered User
bri6672's Avatar
San Diego
Joined Jul 2009
2,291 Posts
Quote:
Originally Posted by Extreme_RC View Post
The 800-73 doesnt seem to lack any torque in my 127mm Ramtec setup, 17lb thrust at 4800 watts on 12s is not too shabby.
How many amps??
bri6672 is offline Find More Posts by bri6672
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 03, 2012, 08:45 PM
Extreme CNC Alloy EDF
Extreme_RC's Avatar
Australia
Joined Mar 2006
11,761 Posts
115A, pretty nice balance point and I wouldnt call it inefficient either
Extreme_RC is offline Find More Posts by Extreme_RC
Reply With Quote
Old Dec 03, 2012, 10:07 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
21,280 Posts
that sounds really good ...was that on the test bench? thats a lot of thrust for the watts and amps .
AIR SALLY is online now Find More Posts by AIR SALLY
Reply With Quote
Old Dec 03, 2012, 10:25 PM
aka JetMan Joe
MCSGUY's Avatar
Joined Feb 2010
2,783 Posts
Yeah, that seriously got my attention, tell me more
MCSGUY is offline Find More Posts by MCSGUY
Reply With Quote
Old Dec 03, 2012, 11:49 PM
Extreme CNC Alloy EDF
Extreme_RC's Avatar
Australia
Joined Mar 2006
11,761 Posts
Here it is running with my 2+ year old 5000mah 30c packs, someday I will plug up new packs, every time I think about it I run out of 5000 and 6000's!

You can see my packs sag out and stabilise at 16lb thrust at 4500 watts, not bad eh

Extreme RC's 127mm CNC Alloy Ramtec Fan with our new 5075 inrunner! (2 min 44 sec)
Extreme_RC is offline Find More Posts by Extreme_RC
Reply With Quote
Old Dec 04, 2012, 10:12 AM
Registered User
bri6672's Avatar
San Diego
Joined Jul 2009
2,291 Posts
That's similar to the scorpion DynEmax set up so not bad at all. The thing about the Ramtec we have found is that in the air it seems to take longer to get on step, it must be something to do with the blade pitch. We ran one with a Big Screamer and it produced 20lbs of thrust but pulled around 190 amps, once on step it was good but even with ample thrust tube diameter it just lacked low end thrust compared to the Dynamax, Schubeler HST and Turbax.
bri6672 is offline Find More Posts by bri6672
Reply With Quote
Old Dec 04, 2012, 03:21 PM
aka JetMan Joe
MCSGUY's Avatar
Joined Feb 2010
2,783 Posts
Quote:
Originally Posted by Extreme_RC View Post
Here it is running with my 2+ year old 5000mah 30c packs, someday I will plug up new packs, every time I think about it I run out of 5000 and 6000's!
You can see my packs sag out and stabilise at 16lb thrust at 4500 watts, not bad eh
Not bad at all, thanks.
MCSGUY is offline Find More Posts by MCSGUY
Reply With Quote
Old Dec 04, 2012, 03:47 PM
Extreme CNC Alloy EDF
Extreme_RC's Avatar
Australia
Joined Mar 2006
11,761 Posts
Funny as others have found the ramtec faster in the air, and it certainly was reported as such back when running OS91's in the glow days.
Extreme_RC is offline Find More Posts by Extreme_RC
Reply With Quote
Old Dec 04, 2012, 04:54 PM
Registered User
United States, TX, Grand Prairie
Joined Nov 2005
5,888 Posts
Quote:
Originally Posted by bri6672 View Post
That's similar to the scorpion DynEmax set up so not bad at all. The thing about the Ramtec we have found is that in the air it seems to take longer to get on step, it must be something to do with the blade pitch. We ran one with a Big Screamer and it produced 20lbs of thrust but pulled around 190 amps, once on step it was good but even with ample thrust tube diameter it just lacked low end thrust compared to the Dynamax, Schubeler HST and Turbax.
Bri, this is the motor I saw the 160 amps on I mentioned in the other thread.

I would think the Big screamer motor was more efficient, prolly not a good test motor after reading this

IINM Marks using a custome motor?

Decent numbers no doubt

Mark have you tested it on 14s yet?

Regards
erh7771 is online now Find More Posts by erh7771
RCG Plus Member
Reply With Quote
Old Dec 04, 2012, 04:54 PM
aka JetMan Joe
MCSGUY's Avatar
Joined Feb 2010
2,783 Posts
Quote:
Originally Posted by Extreme_RC View Post
Funny as others have found the ramtec faster in the air, and it certainly was reported as such back when running OS91's in the glow days.
I'm no expert but my guess is that it might have the equivalent of a higher pitch. Takes more to get in step but moves more air when it does?
MCSGUY is offline Find More Posts by MCSGUY
Reply With Quote
Old Dec 04, 2012, 05:00 PM
Extreme CNC Alloy EDF
Extreme_RC's Avatar
Australia
Joined Mar 2006
11,761 Posts
No I am using the 800-73, I had been pushing het for a 45 or 50mm inrunner for a looong time now, was so happy when they sent me the samples to test!

Yes have run it on 14s, still using my old 5000 packs, the results were 141.4A and 7100W for 20.9lb thrust. With some big packs behind it we will see a good 22lb at 160A I reckon. Temps were a non event, in the alloy housing the motor runs really well.
Extreme_RC is offline Find More Posts by Extreme_RC
Reply With Quote
Old Dec 04, 2012, 06:01 PM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
21,280 Posts
what kv 800-73 ?
AIR SALLY is online now Find More Posts by AIR SALLY
Reply With Quote
Old Dec 04, 2012, 06:58 PM
world's slowest builder
Air-Jon's Avatar
CA
Joined Oct 2006
855 Posts
Should be the 590 KV
Air-Jon is offline Find More Posts by Air-Jon
Reply With Quote
Old Dec 05, 2012, 01:19 AM
Registered User
bri6672's Avatar
San Diego
Joined Jul 2009
2,291 Posts
We have tested the big screamer in both fans, once on step the Ramtec is great and has good top end performance but just lacks the low end power. The Dynamax seems to be more balance with a good blend of low end and top end, the higher pitch is moving more air when on step but it takes longer to get there. This is all real world expierence not hypotheticals, if I haven't tested it myself I don't comment on it! Maybe Extreme Rc's stators are making a difference??
bri6672 is offline Find More Posts by bri6672
Reply With Quote
Old Dec 05, 2012, 03:01 AM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
21,280 Posts
thats what i was thinking too ,back in the day i played with longer stators on the turbax and larry and i felt that it helpd with thrust and speed.im sure his alloy shroud has less startors than a Ramtec fan ,and they may be shaped different. the 590 kv could account for the lower amps...i think he just has a great set up there ,those are great thrust to amp numbers.
AIR SALLY is online now Find More Posts by AIR SALLY
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Falcon 120 Motor Mount racer1 Electric Ducted Fan Jet Talk 2 Feb 02, 2010 12:41 AM
Discussion Another Falcon 120 Twin EDF flyguide7 Electric Ducted Fan Jet Talk 2 Sep 06, 2009 01:08 PM
Discussion Falcon 120 EDF Conversion flyguide7 Electric Ducted Fan Jet Talk 6 Nov 28, 2008 09:04 AM
Video Falcon 120 flying wing conversion with a pusher prop Knife Liddle Electric Plane Talk 2 Nov 11, 2008 10:55 AM
Sold Nitroplanes Falcon 120 flying wing conversion Knife Liddle Aircraft - Electric - Jets (FS/W) 0 Nov 09, 2008 10:09 PM