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Old Apr 29, 2014, 11:47 PM
efflux RC's Avatar
United States, CA, Santa Clarita
Joined Aug 2009
8,416 Posts
Bummer about the wire. At least it's easily fixable. Saw the video in the other thread. I don't even fly my own stuff that's 150+. But if you can, for speed runs. (for the sake of PC based Doppler and a radar gun), try to make the hot passes. 50 -100 ft in front of the camera (a dedicated video camera if possible) and the altitude as low as possible (25-50 ft)
This will minimize the cosine effect of the radar(which will display a lower speed as the angle from gun to jet increases. Also, for Doppler, you should be close in for a good audio level.
Have fun in Ottawa!
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Old Apr 30, 2014, 01:04 AM
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United States, CA, Lancaster
Joined Jan 2009
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Well it looks like the Yep 150 blew my 1W 40 also. Winding resistance is almost 2 ohms. After opening it up I could see discoloration on the enamel also. So I need another motor for more testing.
With the old setup I was seeing a peak around 130 amps on 6 cells. I did take my Delta V 80 mm rotor to try to see if I could change the pitch. All it needed is a little heat from a heat gun and the blades bend quite easily. I need to see if the blades will hold at 62K.
I see there is some 4 cell motors out there that are limited at 90-120 amps and around 3000kv so running on 6 volts will get me were I want that, is if the bearings will hold at that speed. I still want to run a 6 cell setup because of weight. I have a very limited selection of motors in the inexpensive market. So what next tandem motors and dual controllers?
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Old Apr 30, 2014, 01:56 AM
efflux RC's Avatar
United States, CA, Santa Clarita
Joined Aug 2009
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Not sure what your exact setup is. But I've run the e-flite 80mm rotor in the e-flite 80mm housing to 51282 rpm.
This pushes a 8+ lb Habu 32 to 150mph (upwind downwind avg'd)

Are you running a 70mm Eflite rotor with the 1W-40? I say this because the 80mm rotor takes a 5mm shaft (unless you modded it.

Are you considering cutting the 80mm rotor down to 70mm? If so it would surely run at higher rpms and take more watts than I ran mine at. (2291W @ 51282 max)
I've run Wemo pro 69mm , Mach 70 and Shubie HDT rotors in the mid 60's with no problem.
As far as bending the rotor blades, unless your using a fixure to bend them at precisely the same angle, that will play heIl with the rotor balance. I'm not sure what heating them would do to the composition of the material regarding tensile strengh, but experimenting is fun, at your own risk and using safety precautions.

Just some food for thought.
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Old Apr 30, 2014, 05:07 AM
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United States, CA, Lancaster
Joined Jan 2009
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I used a hyperion collet on a cut down 80mm e-flight rotor in a changesun 70mm, 7 stator shroud with a 1W 40 motor. My 190 mph ram air test did show that a reduced intake area does cause a slight vacuum. So the intake area does not cause any drag. If the intake was 100% FSA I did see drag (pressure) building up. So I need to either increase motor rpm , increase the blade twist or exhaust area. My best setup was 90% FSA with a 80% FSA exhaust. At 180 mph ram I was seeing 290mph exhaust. Thrust was almost 4 lbs and an estimated drag was 2 lbs. Current was 135 amps when the YEP ESC blew.
So now I am just looking for the next step so I twisted the blades to 50 degrees as viewed at the tip. I had each blade in some soft rubber in a vice with about 3/8" of the blade sticking out near the hub. I applied about 150 F heat in this area and the blades twisted easily. I used a caliper and a reference scale to make sure all the blades were at the same angle and distance apart.
I did get some 200 amp Himodel ESC to do more testing and this is were I found out the motor problem. The best setup I seen so far is the 1W-40 on 6 cells.
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Old May 01, 2014, 02:53 AM
efflux RC's Avatar
United States, CA, Santa Clarita
Joined Aug 2009
8,416 Posts
Quote:
Originally Posted by p901P901 View Post
I used a hyperion collet on a cut down 80mm e-flight rotor in a changesun 70mm, 7 stator shroud with a 1W 40 motor. My 190 mph ram air test did show that a reduced intake area does cause a slight vacuum. So the intake area does not cause any drag. If the intake was 100% FSA I did see drag (pressure) building up. So I need to either increase motor rpm , increase the blade twist or exhaust area. My best setup was 90% FSA with a 80% FSA exhaust. At 180 mph ram I was seeing 290mph exhaust. Thrust was almost 4 lbs and an estimated drag was 2 lbs. Current was 135 amps when the YEP ESC blew.
So now I am just looking for the next step so I twisted the blades to 50 degrees as viewed at the tip. I had each blade in some soft rubber in a vice with about 3/8" of the blade sticking out near the hub. I applied about 150 F heat in this area and the blades twisted easily. I used a caliper and a reference scale to make sure all the blades were at the same angle and distance apart.
I did get some 200 amp Himodel ESC to do more testing and this is were I found out the motor problem. The best setup I seen so far is the 1W-40 on 6 cells.
Interesting that the YEP 150 fried at 135. I don't have any experience with them yet.
Sounds like a pretty consistant method for bending the rotor blades. You might consider going to a higher cell count set up for gettning these higher speeds. there are some very capable Mega motors in 28mm (with 4 or 5 mm shafts). a bit pricey but the factory max amp specs are conservative.
I wish I had the time to try out a 16/45 or 16/50 series.
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Old May 01, 2014, 08:39 PM
Battery Puffer
Orange, California, United States
Joined Nov 2001
995 Posts
Controllers don't take motors out. But motors can definately take out controllers when they let go.

Mark
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Old May 01, 2014, 11:38 PM
My project: FAIREY DELTA 1
Erik v. Schaik's Avatar
Uden Volkel, Netherlands
Joined Dec 2003
4,974 Posts
I have been over currenting controllers up to 115% but one needs to take some thoughts to achieve this. Without cooling everything fries eventually when pushhed hard like we do.
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Old May 02, 2014, 06:10 AM
FireHawx
United States, FL, Jacksonville
Joined Oct 2011
1,040 Posts
Quote:
Originally Posted by efflux RC View Post
Interesting that the YEP 150 fried at 135. I don't have any experience with them yet.
Sounds like a pretty consistant method for bending the rotor blades. You might consider going to a higher cell count set up for gettning these higher speeds. there are some very capable Mega motors in 28mm (with 4 or 5 mm shafts). a bit pricey but the factory max amp specs are conservative.
I wish I had the time to try out a 16/45 or 16/50 series.

That was my thoughts, why has no one taken the 1W40 up to 7S? That would seems to be the ticket. With proper throttle management you should be fine.
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Old May 02, 2014, 02:38 PM
efflux RC's Avatar
United States, CA, Santa Clarita
Joined Aug 2009
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Depending on what rotor it driving the amps will really high. I've seen 120 (max)on the bench and 135+ (max) installed, on 6s with a Mach EDF. (9 blades @ 65K+ rpm)
The first one I would try for 7 would be the 16-40-1E (2910kv) it equates to 95kv (no load) higher than the 1W-40 on 6s.
http://effluxrc.com/MEGA-16-40-1E-4M...-40-1E-4MM.htm

Pushing stuff for high speed is always considered experimental. You might look at what the hot rod pusher prop guys are doing (Funjet and Stryker). Props require different kvs, but amps are amps. They are a very adventurous group.
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Old Jun 12, 2014, 10:58 PM
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capt soap's Avatar
dallas tx
Joined Jun 2003
2,843 Posts
Who's leading the 70 class cup? Tom still at 189?
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Old Jun 13, 2014, 07:02 AM
Aka: Tom Jenkins
ApexAero's Avatar
Palm Beach County, Fl.
Joined Aug 2008
4,389 Posts
I think so Lee, The only passes on tape, there fore it did happen!
Best pass on tape so far was 198.6 mph!
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Old Jun 13, 2014, 02:36 PM
efflux RC's Avatar
United States, CA, Santa Clarita
Joined Aug 2009
8,416 Posts
Unless your at a "live" speed runs event, where best pass of those present, win, "best pass" means nothing.
What's the top "Upwind / Downwind", averaged speed?
...........



Edit:
Great! it 's right there on the first post of the thread. I had forgotten the speed Tom. That's movin'

.................................................. ..............
Leader board as of 2-26-2014
1st NEW RECORD!!! avg is 189.6mph for the Ergo jet of ApexAero 3-1-14
2nd Place is Team HabuBurners with avg speed of 186mph
3rd Place fh64_Lucky with avg speed of 185mph
4th
5th
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Last edited by efflux RC; Jun 13, 2014 at 03:44 PM.
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