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All Forums >> RC Helicopters >> Electric RC Helis >> Corona 120 Mods & Hop-ups
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Corona 120 Mods & Hop-ups - 8/20/2003 6:23:13 PM   
Mini Boy


 

Posts: 432
Joined: 2/4/2003
From: Webster, MA, USA
Status: offline 		Tocano:

On a brushed motor, it is preferred to run it , with NO load, for a half hour or so on a couple of "D" cells in series (3 volts) or a regular pack that is low to get the brushes seated to the commutator witout excessive sparking. This gives you longer brush and comm life in normal service.

For what it's worth,

Russ

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       Post #: 176

Corona 120 Mods & Hop-ups - 8/21/2003 1:50:50 AM   
Zflyer



Posts: 334
Joined: 5/9/2003
From: Norwich, CT, USA
Status: offline 		Well the rest of my parts came in today so I can this Heli back up, So as soon as I unwind from work I'll start with the Deans connectors and work my way to re-assemble the Boom and T/R then it's off to Wally World to get the training gear goodies, So I should be back up in proper form by the weekend

Frank

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       Post #: 177

Corona 120 Mods & Hop-ups - 8/21/2003 12:45:28 PM   
tocano


 

Posts: 178
Joined: 4/30/2003
From: Perth, AUSTRALIA
Status: offline 		Zflyer: I heard good things about RD6000 but I am a loyal (some say stupid) JR guy. I always been happy with the products and all charger plugs, receivers etc except for the gyro are setup for JR. Someone is selling his old x388 in exellent cond. for $100, I will be looking and reading the x388 manual to see what it can do. If it doesn't work I can always sell it again.

Mini Boy: I will run in the AF motor like you mentioned.

I constructed the tail boom and rotor yesterday. I find that is has a bit of friction. Smooth but I can feel the friction, it's a bit heavy to turn. I don't think is my setup more like that fact is has bushing rather than ball bearings.

(in reply to Zflyer)
       Post #: 178

Corona 120 Mods & Hop-ups - 8/21/2003 5:04:42 PM   
Zflyer



Posts: 334
Joined: 5/9/2003
From: Norwich, CT, USA
Status: offline 		That's ok Tocano, TX's are more a personal preference item now a days. I noticed that the T/R seems a bit on the heavy side when you turn it yourself but I've not noticed any friction in fact I'd say it's rather smooth for a bushing set up

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       Post #: 179

Corona 120 Mods & Hop-ups - 8/21/2003 6:24:14 PM   
tocano


 

Posts: 178
Joined: 4/30/2003
From: Perth, AUSTRALIA
Status: offline 		Zflyer: I think that is what I meant to say, it's a bit heavy to turn.
Sorry got leave now I am connstructing the swashplate. Talk to you again tomorrow.

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       Post #: 180

Corona 120 Mods & Hop-ups - 8/21/2003 8:48:11 PM   
tocano


 

Posts: 178
Joined: 4/30/2003
From: Perth, AUSTRALIA
Status: offline 		Just finished the swashplate and while surfing the net I found pictures of Corona with Voyager E gear on one forum and they think it's better to strap the landing gear with nyties rather than using the screws. Because if you have a hard landing you want the nyties to break so the landing gear and the crutch are not damaged. It does make sense, look a bit messy but. What do you think guys?

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       Post #: 181

Corona 120 Mods & Hop-ups - 8/21/2003 8:59:47 PM   
Zflyer



Posts: 334
Joined: 5/9/2003
From: Norwich, CT, USA
Status: offline 		I've seen some other configurations on R/C groups but I'm happy with what I did for my VE gear, instead of pine block I used balsa 1"X 1" square stock, easy to work with and sandwitched the ends where the screws go thru with 3/32" HobbyPly and CA , Light and Strong but should give in an above "NORMAL?" impact. I halved the Balsa glued on the ends and sanded to finish. The back mount is still held on with TY-Wraps

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       Post #: 182

Corona 120 Mods & Hop-ups - 8/21/2003 9:15:58 PM   
Zflyer



Posts: 334
Joined: 5/9/2003
From: Norwich, CT, USA
Status: offline 		Not to jump here but for Knimrod and Mini Boy I think I might have the problem with that tail swing on takeoff is. The RD 6000 Super by default in Heli mode sets up a throttle curve 5 point with the different percentages and I think it might be this thats causing the tail swing, I took a small hop late last night to make sure I was back where I was as far as set-up and on the second hop I spooled up slower then eased it up and had no swing so I think if I adjust the mid points a little I can smooth it out so I don't get that surge and the swing

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       Post #: 183

Corona 120 Mods & Hop-ups - 8/21/2003 10:31:45 PM   
Mini Boy


 

Posts: 432
Joined: 2/4/2003
From: Webster, MA, USA
Status: offline 		A couple of thoughts:

The tail rotor gearbox (and ALL the gear sets) want to have a barely perceivable amount of lash(slop) between them at the tightest mesh point. You may need to loosen the bolt that goes through the boom and pull/twist the gearbox "out" of the boom a smidgeon, to allow a little play in those gears, and the "hardness" to turn the drivewire may go away. Keep in mind, the grease will offer some resistance. In any case, you don't want to feel the gear teeth grinding and jumping ... way too tight ... a little looser is better than tighter.


Tocano:
Most of the voyager support extensions I've seen on Coronas are tywrapped to the crutch to allow for "breakaway" in the event of a "hard landing". Meanwhile, the gear is screwed to the fabricated extension. If you glue or screw the extension to the crutch and tywrap the gear to it, the end result, either way, will be the same.

Z Man:
Quick throttle responses will likely cause tailswing with or without a gyro ... slow throttle response will give you better overall smoothness until you get good enough for aerobatic maneuvers.

My two cent on a beautiful Thursday in New England,

Russ

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Enjoy The Weather, It's The ONLY Weather You Have!

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       Post #: 184

Corona 120 Mods & Hop-ups - 8/21/2003 10:51:20 PM   
KnimRod



Posts: 145
Joined: 5/12/2003
From: Central, MI, USA
Status: offline 		In heading hold mode, the gyro initializes at the servo's neutral positon. It is happy as a clam sitting there with no tail movement at the neutral position no matter where the TR pitch is. Until the tail moves and a heading error is integrated from the angular acceleration into a new servo position, you will get this swing. The idea is to minimize the amount of angle (and time) the servo has to move from neutral to say.. hover.

I think you'll find that adjustments to the TR spider and linkage that pre-load the TR at the servo's neutral will just fix it all together. It work's great for me.. I can practically nail the throttle from a stop and the TR barely moves. It also serves to keep the piro rates uniform in both directions.

(in reply to Zflyer)
       Post #: 185

Corona 120 Mods & Hop-ups - 8/21/2003 11:05:23 PM   
Mini Boy


 

Posts: 432
Joined: 2/4/2003
From: Webster, MA, USA
Status: offline 		Hi Knimrod:

Thanks for the "heads up" on the TR spider adjustment. I must have come pretty close by sheer luck, as I have only a tad of tail wag when applying fairly agressive throttle inputs.

Russ

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Enjoy The Weather, It's The ONLY Weather You Have!

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       Post #: 186

Corona 120 Mods & Hop-ups - 8/21/2003 11:34:32 PM   
KnimRod



Posts: 145
Joined: 5/12/2003
From: Central, MI, USA
Status: offline 		After the initial error is taken up, it's not much of a problem unless you are so far off that there isn't much room left in one direction of servo travel. But you will notice that piros are much faster in one direction than in another and may experience the quick tail jog when powering up. It's not that big of a deal and some setups can be worse than others.

If you preload the TR pitch with the servo neutral position, your center already accounts for the anti-torque needed for flight and TR pitch changes in either direction result in a more uniform response. There is an additional benefit in that you will have almost no drift or require a trim change when switching from HH to rate mode.

That's my story anyways... And I'm sticking to it.

(in reply to Zflyer)
       Post #: 187

Corona 120 Mods & Hop-ups - 8/22/2003 12:07:07 AM   
Zflyer



Posts: 334
Joined: 5/9/2003
From: Norwich, CT, USA
Status: offline 		Thanx Guys I'll have to give that a try, a little at a time, I just thought the throttle curve might not be smoothly applied as I power up kind of stepping so that it was causing this tail swing

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       Post #: 188

Training Gear - 8/22/2003 5:20:57 AM   
Zflyer



Posts: 334
Joined: 5/9/2003
From: Norwich, CT, USA
Status: offline 		T/G Pic

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Should Your Heli Crash or be captured the Secretary will deny all Knowledge

(in reply to Zflyer)