E720 Flight #4 - HeliFreak
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Raptor G4/E720 Thunder Tiger Raptor G4/E720 Helicopters


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Old 03-17-2012, 09:02 PM   #1 (permalink)
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Default E720 Flight #4

Still needs a little tweaking, but I'm really enjoying this heli. Super smooth and super quiet and BIG blade farts. The sound in the vid doesn't do it justice. Sounds like a loud sewing machine.

[ame]http://www.youtube.com/watch?v=xTg3Q3G-B-o[/ame]
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Old 03-19-2012, 10:33 AM   #2 (permalink)
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Sounds really strange... you're sure there's nothing wrong? TT and main drive on mine is really quiet, you can't hear mine until I switch to 2000+ and one hears blade sound.
-Klaus
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Old 03-19-2012, 10:43 AM   #3 (permalink)
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Nice rm!!!
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Old 03-19-2012, 12:44 PM   #4 (permalink)
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Like I said, it just sounds like an angry sewing machine in the vid. It really does sound nice and smooth irl.
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Old 03-20-2012, 01:01 PM   #5 (permalink)
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sounds like gear mesh may be tight and pinion is too high allowing setscrews to tic the bottom of the maingear.
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Old 03-20-2012, 07:08 PM   #6 (permalink)
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Awesome flight, you've got me wanting to get mine flying really bad. Sadly I have to wait to finish mine since the money that was going to go towards servos just got sunk into a blown radiator on my car.
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Old 03-23-2012, 03:55 PM   #7 (permalink)
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Originally Posted by gwright View Post
sounds like gear mesh may be tight and pinion is too high allowing setscrews to tic the bottom of the maingear.
Trust me when I say Gary has ears acutely tuned to listening to gear mesh...he made me lube mine at OHB when I would not adjust the mesh in the field! It seems I was annoying him and mine was really not that bad.

Steve
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Old 03-24-2012, 08:06 AM   #8 (permalink)
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Well the set screw wasn't touching the gear, but I did go back and take a look at the mesh. I guess things must've moved a bit or something, 'cause it was tight. Readjusted, and it's a bit quieter now.

It still seems a lot louder in that vid than it did irl. The mic amplified it I guess.
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Old 04-12-2012, 06:23 AM   #9 (permalink)
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My ears aren't that acutely tuned,.. you must not have had your hearing aid set properly and didn't realize it was that obnoxious <G>

(for Kaluf)

Last edited by gwright; 04-12-2012 at 10:11 AM..
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Old 04-12-2012, 06:29 AM   #10 (permalink)
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My WHAT?! Jeez, I'm only 32!

Maybe it's time to invest in one
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Old 04-12-2012, 07:55 AM   #11 (permalink)
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That was for Kaluf,.. sorry
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Old 04-18-2012, 12:00 PM   #12 (permalink)
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Ah heck, I know I can't hear...
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Old 04-19-2012, 11:24 PM   #13 (permalink)
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Cool Joe, what you running for motor, pinion and blades there? Looks like you can run slow or fast on these and good behaviour!
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Old 04-20-2012, 06:39 AM   #14 (permalink)
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Hey Shawn, yeah it behaves nicely through pretty much everything other than screaming fast forward flight. (Then it gets just a bit pitchy).

I'm running the Scorpion 4035-450kv with a 13T pinion. Low headspeed is 1600rpm, high at 2000. The blades are RotorTech 710s.
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Old 04-20-2012, 05:57 PM   #15 (permalink)
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rotormonkey,
How are the vibes on this thing? Does the SK-720 complain?
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Old 04-21-2012, 08:06 AM   #16 (permalink)
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Sk720 is around 1-2 in the logs unless I really bang the sticks around. Then it spikes to 7-8 briefly. I haven't bothered tracking it down though as I'm not using self levelling.

The gear mesh was also tight last time I checked so it could be fine now.
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Old 05-30-2012, 03:00 PM   #17 (permalink)
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Nice flight !
Quote:
sounds like gear mesh may be tight and pinion is too high allowing setscrews to tic the bottom of the maingear
EXACTLY why mine was a little noisey on the first flight, what Gary said. I swear there's about 1/6538th of a mm spacing between that tail pushrod guide and the gear too, but it clears it. Barely.
It's really some silky smooth flyer isn't it ?
It makes some ,'Brand X ' types at tthe field sound almost....cheap .
That makes me feel good because my flying skills look "cheap" Doug
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