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01-12-2006 12:05 AM  13 years ago
rotaryguy

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Florida

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logo feathering shaft
Dont think the logo feathering shaft will work because the logo shaft is smooth with no ball but the logo head is tapered internally to keep the whole shaft from moving vertically where the swift is the opposite it has the ball on the shaft to keep it from moving up and down inside the head.
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01-12-2006 10:03 AM  13 years ago
brucepeter2002

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Croydon, UK.

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Swift vibration fix.
For anyone looking at this topic for the first time...
The fix together with pictures was listed on page 6. (Rotaryguy).
As page entries have gone on anyone with the problem looking at the topic for the first time may not know the fix method was posted...
The link was
http://68.154.240.241/helipics/SWIFT.doc

Regards Peter Bruce.
Clear sky for all my hobbies.
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01-12-2006 11:16 AM  13 years ago
coolice

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Northamptonshire, England

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Hey Peter,

Just reading your instructions once again, I would suggest adding in a sentence advising builders to apply a lite smear of grease to the dampers & feathering spindle before re-assembly. Keeping any grease away from and threaded bolt holes or threads so the loctite has a clean surface to bond to.

While we're stiffening up the head the grease stops the dampers grabbing on the feathering spindle should it need to move a little in flight.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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01-12-2006 04:16 PM  13 years ago
pigs dont fly

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City, State - Country

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Well done on the fix guys! Youve got me wanting a Swift again Warning...This hobby is very addictive and may damage your wealth
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01-12-2006 07:33 PM  13 years ago
Lenny970

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Colorado

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Ian,
I've used Tri-flo teflon lubricant for this in the past. Is grease a better choice? Are you talking about the white grease?


Thanks,
Lenny
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01-12-2006 08:56 PM  13 years ago
coolice

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Hey Lenny,

Yeah, just a good quality grease I find works well.
I used to use Tri-Flow grease myself a few years back and this will work great, but what I have now is a tube of Tamiya Diff Grease which has a nice feel to it without being to thick.
You only need a light smearing of it over the spindle itself, the centre teeter ball & around the dampers.

I find doing this allows the shaft to slide through the dampers easier & centre better. Without any lubrication pushing the dampers along the shaft is difficult as the rubber grips the metal & I'd imagine that while flying and the shaft wanting to move slightly as the rotor disk deflects with control inputs it's the same. Hence the disk will not move smoothly if it needs to, this sometimes shows up as a nod in flight normally.

For me it's something I've always done on my machines, but with an ARTF model you could over look it. In the case of the Swift, combined with tightening the head damping it may help a bit more in smoothing things out.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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01-12-2006 09:19 PM  13 years ago
SRH990

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Birmingham, UK

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Trev,
have you got a part number for the Predator steel shims? I spent a frustrating 1/2hr in Midland Heli's this afternoon trying to find a suitable shim, Predator or otherwise! I had a quick skim round B & Q, as you do, and the washers they have are really two thick, 1mm plus?

I took it out with the 3D motor and the 8T pinion on this morning, head speed 1800 - 1850. I stuck my new Watts Up meter on it (my Irvine meter is a little large for even a Swift to lug around ). The highest recorded current was 38.98A which I guess was during one of the full stick climb outs, average of 33.3Wh with a peak of 551.9Wh. It was only basic figure of eights at the moment, plus the climbouts, so this shows even under full load it's not stressing the setup. I'm ordering the 9T pinion so I'll see how this changes things.
Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4
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01-12-2006 09:39 PM  13 years ago
Dorset Boy

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Dorset England

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Steve not sure on the part No but I can find out.
But it might be faster to give your mate Dean a ring.
If you have no luck shoot me a pm and i'll sort somthing out.
i think you will find the nine tooth pinion much better for your setup.

Coolice are we going to play the same games with these as we do with the hummers? This is going to be a fun year

Trev
Century Helicopters, Coolpower Fuel, Flight Power Batteries, CSM Gyros, Futaba from Hobby Hangar
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01-12-2006 10:13 PM  13 years ago
coolice

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Northamptonshire, England

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Steve,

Predator shim part no. HW6182 (Damping Shims)

Trev,

Hehehe, yeah if we want our heads to be chopped off. I think we're gonna have to find a bit bigger box to try & land them on top of

Will be a great season again, looking forward to Charmouth actually now.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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01-12-2006 10:27 PM  13 years ago
SRH990

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Birmingham, UK

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Ian,
I looked at HW6182 at Midland Helis today, on the Predator manual they look like steel shims but in actual fact they are rubber O rings.
Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4
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01-12-2006 10:49 PM  13 years ago
rotaryguy

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Florida

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head block dampener hole depth
I have something new....

I added a 1 mm shim to each side of the head between the grip and head and it did improve somewhat but it is still not to my liking so I decided to check a few more things.

The biggest thing I found was the depth of the cut in the head for the dampeners is .005in different between the two sides of the head!
This has to contribute something.
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01-12-2006 11:23 PM  13 years ago
rotaryguy

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Florida

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OK...
I just put together a new o-ring system and spooldown on hard surface was almost COMPLETELY SMOOTH, its a partial logo dampening system with one of the o-rings swapped for a slightly smaller one and it looks great also, I am unsure of how it will act in flight as darkness is setting in but I will fly tomorrow. Hopefully it will be as good or more responsive.
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01-13-2006 02:33 AM  13 years ago
osborn

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Richmond, CA

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Which washer to use?
Regarding the choice of washer to use for insertion between the blade grip and the brass blade grip spacer, there is a special washer which goes between the thrust bearings and the outer radial bearing in the blade grip. These would be perfect for this purpose. You get a new set of these washers (as well as the retaining socket heads and washers) when you order a new feathering spindle (CNE521 for $5.99 direct from Century).

Another idea (not tried yet) is to shorten the feathering spindle. This will only work if the shoulders on the ends are long enough so that when the socket head cap screw and washers are installed, that the thrust bearings are NOT preloaded. Assuming the shoulders are extra long, then shortening the feathering spindle .25 - .5 mm on either end will have the same effect as adding the shims discussed above. Probably would want to use a lathe to do this so that the ends stay perfectly flat and square to the spindel axis.

I am expecting that Century will address this soon, probably with slightly longer dampers since that would be the easiest component to modify. Assuming they are listening...

-- James
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01-13-2006 03:12 AM  13 years ago
rotaryguy

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Florida

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Century USA told me they are unable to reproduce this so far but seem very interested in helping.

As far as the washers that come with the feathering shaft I think they are too big and fit sloppy over the shaft, they would sag. They are 9mm id 13mm od. 1mm thick.

You have almost 1mm of extra space left on the feathering shaft with the bearings installed...or at least the one I have here so shortening that would probably help also but I had to take out about 1.5mm on each side to smooth mine out, maybe even more I will recheck when I disassemble the head again.

Its funny I have two cne521 new in bag but only one came with the large washers, oh and a new set of paddles doesnt come with the covering film either.
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01-13-2006 05:19 PM  13 years ago
SRH990

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Birmingham, UK

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After trying to find a 'stock' washer through other sources I've had a good look at the head tonight. The washer that is listed as part of the feathering spindle - CNE521 - fits under the thrust bearing in the blade grip. Doubleing up on these will have the same effect as a washer between the brass spacer & the damper, this will add preload. The reason the shim is so sloppy on the feathering spindle is that it only bears on the outer ring of the outer radial bearing, otherwise it binds. Unfortunately I bought a spare feathering spindle before Christmas and these washers weren't included, only the feathering spindle plus the two cap head screws & washers.Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4
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01-13-2006 07:53 PM  13 years ago
upperking

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Spring Hill, Florida

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I dont have a swift yet and this is the reason why its to new and want to wait for the major bugs to be fixed first.. but I bought the MX 400 when it first came out and added a CNC head to it and got the same sort of shake in the head on spool up and down.. and after weeks of trying and almost giving up it was something as simple as,
The problem is the bushings are to long and do not hold the seesaw in place solid and it has way to much slop "you cant realy tell but enough to make the head wobble at low head speeds...

video of it happing in flight below "it started happening when I lowered the rpm and head speed and the extra weight of the camera really brang it out"
http://www.upperboard.com/abash.wmv

http://runryder.com/t218176p1/

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01-13-2006 08:22 PM  13 years ago
SRH990

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Birmingham, UK

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Apart from this issue with resonance, I haven't seen any other issues or bugs with the Swift, at the moment it seems pretty good out of the box otherwise and it's not like you have to spend a couple of hundred £/$ to get it to fly well. I'm only trying the shims to remove the last vestige of shake on spool up & down, in the air its smooth as silk.Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4
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01-13-2006 09:09 PM  13 years ago
rotaryguy

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Florida

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OK, I lied...it still shakes on spooldown but in flight is has smoothed out. I guess the darkness lastnight was hindering me being able to see it clearly.

Steve, I may try your idea in addition to the shim I have between the grip and head as I have a set of those washers
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01-14-2006 03:10 AM  13 years ago
rotaryguy

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Florida

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Looks great!
I thought about using a logo 10 head until I added it all up...almost $300 without the swash!

BUT!!!!!
We should not have to make a hybrid heli to cure this disease!!!
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01-22-2006 02:06 PM  13 years ago
rotaryguy

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Florida

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anyone else....
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