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HomeScaleAircraftHelicopterScale Model RC Helicopters › TREX600E 5-Blade head with battery problems
08-13-2010 01:33 AM  8 years agoPost 1
Daniel Reese

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Urbana OH

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Building an MD500E on a stock TREX but having flight duration problems

600L motor, 10t pinion, 75A ESC and using a variety of 6S/5000mah lipos.

Throttle curve normal: 0-15-95-97.5-100
Throttle curve idle 1: 95-95-95-97.5-100

Pitch curve (all modes): 35-42-50-75-100
(in degrees: -2 -0 +5 +7 +9)
Gets light on the skids at 3/4 stick and picks up at mid stick- pretty much a hover in ground effect, havent needed to go above 3/4 stick for anything yet (just doing hover maneuvers)

The Century .30 sized head and 500mm blades are smooth as silk. Swapped aileron/pitch servo channels and achieved a near 0 angle bladegrip to swash link; phasing is tuned perfectly. All around a smooth ship to fly...for about 30 seconds...

Using Thunderpower 6S1P 5000mAh 25/50C and TrueRC 6S1p 5000mAh 10/15C. You'd think the Thunderpowers with the 25/50C would last longer but they dont. The TrueRCs do a bit better.

Best flight time was 3min hover and hover maneuver on one of the TrueRC packs, the other TrueRC lasted only 1 minute. Both the Thunderpowers tripped low volt alarm after about 30 seconds.

What can I do?

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08-13-2010 01:48 AM  8 years agoPost 2
iHover

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Berne , NY

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I'm supprised the 10C pack hasnt blown up like a balloon. I had the same setup with the XL motor and was getting 4 min hover and it was really pushing 30-40 c HK packs hard. The packs where new and my headspeed (if memory serves was around 1300). I saw a trex stock setup with 5 bladed head that was getting 5 - 6 min flight times running two 6s 5000mah packs in series.

You had me at Hover

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08-13-2010 05:02 AM  8 years agoPost 3
Mojave

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Palos Verdes, Ca. USA

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What's your head speed? For each blade that you add to the head, you induce more load and drag. I would guess it's a gearing issue, or not enough motor.

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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08-14-2010 12:21 AM  8 years agoPost 4
Daniel Reese

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Urbana OH

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I have no idea what the head speed is (LOL) Ive got no Tach.

I think theres a way to calculate it but I cant find the formula.

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08-14-2010 01:28 AM  8 years agoPost 5
Mojave

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Palos Verdes, Ca. USA

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Here's the link. You should have a rotor tach, especially flying scale heads. My .002

http://www.readyheli.com/headspeed-calculator.html

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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08-14-2010 02:16 AM  8 years agoPost 6
lrogers

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Mobile, Al

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I'm thinking along the same lines as Mojave; that head is loading up and the motor is sucking hard on that battery trying to get up to the speed it wants. How hot is every thing when you land? I did a similar thing one with a boat. I didn't match the gearing to the motor/propeller combination I was using and had a MAJOR meltdown. I'm lucky I didn't set it on fire.

On a side note, using a tach with a five blade head is tricky. A fellow on another site suggested putting a piece of white trim stripe tape across the center of the head button and take the reading there instead of on the blades.

Another thing you might try is a set of the new narrow chord scale blades. I'm running a set on my 450 size AS350 with a three blade head and I really like them. The site I got mine at recently added 600 size blade sets. I got mine at http://www.scaleflying.com

Larry Rogers - R/C Helicopter Pilot

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08-14-2010 02:23 AM  8 years agoPost 7
Daniel Reese

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Urbana OH

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According to a couple calculators Im running between 2000 - 1800 rpm...kinda fast.

How can I slow it down? Bigger pinion?

But wont that require a higher angle of attack to get the same lift, and that would mean more drag and that means more power...sucking the lipos again- isnt faster better than slower?

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08-14-2010 05:47 AM  8 years agoPost 8
Mojave

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Palos Verdes, Ca. USA

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Slow the head down with a smaller pinion gear. Rogers, I forgot to mention the tape on the head button with multi blade rotor heads. Or maybe he can try this:

http://www.helidirect.com/align-mul...emt8-p-7416.hdx

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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08-14-2010 11:10 AM  8 years agoPost 9
iHover

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Berne , NY

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Your swinging 5 blades. Lift isnt going to be a problem.
My two bladed 500E is only running 1600. Your flying scale not pod and boom. Crank it down to 1400 and see how it feels.

You had me at Hover

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08-21-2010 09:28 AM  8 years agoPost 10
Antsis

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Melbourne, Victoria, Australia

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I tested my head swinging 530mm blades and with the mechs back in P&B form. I was using 50% of a 6S 5000mA 25C pack in 7.5 minutes with a headspead of 1650. That was with the stock Align 1650Kv motor/75A ESC and a 10T pinion. I have since changed the motor and ESC to a Scorpion 1100kv motor/120A ESC, but have been away on vacation and not yet had a chance to test it. I was also considering dropping the HS to around 1400 and fitted a 12T pinion.

Ant

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08-22-2010 04:15 PM  7 years agoPost 11
iHover

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Berne , NY

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Those numbers dont sound right. You sure? Off the stock motor and esc at 1400 I was only getting 5 and half min swining 550's. And the packs where coming down hotter than a fire cracker. That was with 13 tooth pinion.

You had me at Hover

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08-23-2010 10:51 AM  7 years agoPost 12
Antsis

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Melbourne, Victoria, Australia

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Those numbers dont sound right. You sure? Off the stock motor and esc at 1400 I was only getting 5 and half min swining 550's
I was running at 1650 with the stock motor. Bear in mind this was with the mechanics out of the fus and the ambient temperature approximately 17C. The battery and motor were cool and the ESC quite warm, but not excessively so.

I have not yet tested the new motor/esc, pinion, HS setup yet.

Ant

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