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HelicopterCompass Knight 50 ODIN 90 › K3D Durability - AWESOME!
06-08-2009 04:07 AM  8 years agoPost 1
JAGNZ

rrProfessor

Auckland, New Zealand

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So, I have now had some time to bang on my 3D pretty good. I would estimate between 30-40 flights. I have gone over the Heli with a fine toothed comb and cannot discern any wear anywhere. It's still as tight as the day it was built.

I am no 3D Master but I do fang her pretty hard and she has held up brilliantly. So far I am VERY impressed with Compass quality...and the flight characteristics are great too. I have wound back the Cyclics on it because out of the box at max throws it is super quick and I was over-pitching it quite a bit.

Just thought I'd share for those wondering what they are like.


Jason Greenwood

www.3dheli.co.nz

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06-08-2009 04:23 AM  8 years agoPost 2
beavis1

rrKey Veteran

New York state

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Yes my oldest 3D is a 3 years now. I have only needed to replace the auto one way and the bearings and pinion in the start stack. The new stack is far better. My links are original. I did wear out a few balls though. The original release the balls were not stainless and would wear.
Really cheap easy maintenance for 3 Years and yea they fly fantastic...

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06-08-2009 11:49 AM  8 years agoPost 3
JAGNZ

rrProfessor

Auckland, New Zealand

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Oh, I also have to mention that the 3D has the most locked in Tail of ANY Heli I have ever flown.


Jason Greenwood

www.3dheli.co.nz

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06-08-2009 12:34 PM  8 years agoPost 4
SteveH

rrProfessor

Texas

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Yes, they fly great, the head stays tight, and they really have no problems, except don't do a hard set down on the gear....it normally takes out the landing gear, landing gear mounts, and the side frames. Every chain has a weakest link.

The government cannot give you anything without first taking it from someone else.

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06-08-2009 08:38 PM  8 years agoPost 5
leadlag

rrVeteran

Worthing UK

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Yep they last and fly so well and last. The only thing I do is when the compass bearing wear is replace them with quality bearings. This IMHO is the only weak part of the model but when I say weak i don't mea Align weak

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06-08-2009 10:45 PM  8 years agoPost 6
JAGNZ

rrProfessor

Auckland, New Zealand

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The only thing I do is when the compass bearing wear is replace them with quality bearings.
It is my understanding that bearings in the critical areas have been upgraded recently by Compass in new kits....


Jason Greenwood

www.3dheli.co.nz

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06-08-2009 10:47 PM  8 years agoPost 7
Ray Fernandez

rrElite Veteran

Guam (U.S.A.)

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Since most of you on this post flew (or may still fly the Century Raven), how does the K3D compare?

Ray Fernandez - GUAM

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06-09-2009 12:16 AM  8 years agoPost 8
SteveH

rrProfessor

Texas

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Ray, I have done some very minor mods to the heads on my K3D's, and they now are more stable, more responsive on cyclic, fly more "accurate", and they are lighter so they auto better. I am talking a small percentage better, however...maybe 10-15% better.

The government cannot give you anything without first taking it from someone else.

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06-09-2009 01:30 AM  8 years agoPost 9
AcidKindred

rrApprentice

Mobile, AL - USA

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IMHO the K3D is way better then the Century Raven. Better quality, better flight characteristics, better engineering. I've had several Century products and they are OK for the money.

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06-09-2009 01:42 AM  8 years agoPost 10
acoustic0309

rrNovice

Mishawaka ,IN

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i run the 600n struts on my k3d. they seem to take quite a beating.

Compass Models
Common Sense R/C
nice heli....wanna see it crash?

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06-09-2009 04:01 AM  8 years agoPost 11
enahs

rrKey Veteran

Rapid City, SD

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Ray, I have done some very minor mods to the heads on my K3D's, and they now are more stable, more responsive on cyclic, fly more "accurate", and they are lighter so they auto better. I am talking a small percentage better, however...maybe 10-15% better.
What are these mods? I'm curious to know what you've done.

---------
Shane

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06-09-2009 04:04 AM  8 years agoPost 12
fenderstrat

rrProfessor

Aston,Pa

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more responsive on cyclic
man, how much cyclic do you need my atom and K503D are crazy fast at stock settings

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

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06-09-2009 12:48 PM  8 years agoPost 13
Eury

rrProfessor

Dover NH

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I'm very happy with the Knight 3d, in fact, I've never had 2 of the same heli flyable, but I've built 2 of these so I have a backup. It took a little grinding of the brass spacers in the mixing arms on the head to get rid of the slop in the head and the heli flies perfectly. It's locked in and stable, and also has very fast cyclics. Also, maintenance is dead simple, pulling the engine and bottom plate is easy, and the whole design is simple and compact. I love this heli, I can't say that I've ever flown any 50 that I thought flew better than it. The Vibe was very similar in the air, but didn't feel quite as agile.

Compared to a Raven, my flight time on the Raven is pretty limited, just a few setup flights with a friend's heli so I never really pushed it. My K3d feels lighter and faster in the air, as well as more precise. Most of that could be setup, of course. Just in general design, I never liked the transmission setup of the Raven, and I prefer belt tails, and direct drive belt tails like the K3d (and Raptor) specifically.

Nick Crego

Citizen #0168

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06-09-2009 03:16 PM  8 years agoPost 14
hornet dave

rrKey Veteran

Cedar Rapids, IA USA

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I've been flying mine for about a year, i'm guessing around 100 flights or so. 1 crash because I flew it into the ground. 1 hard landing broke a landing gear hoop.

Last fall, when it started getting a little colder outside, I stripped the black main gear. I replaced it with the white gear and it's been fine so far.

Early this year, half of the clutch liner came out, which unfortunately knocked a couple blades off the cooling fan.

Out of the box, the autorotation bearing was buggered up.

During my last tear-down to fix the clutch liner, i found the mainshaft bearings needed replacement. I personally think the bearing blocks were not properly aligned during assembly and were at a slight angle to each other, but there's no way to know for sure. When I put it back together, I made sure the bearings were straight with each other.

I think I've only replaced one or two ball link ends.

My last failure was the lower rear frame spacer, where the boom supports attach to the frame. This spacer is susceptible to fatigue stress the way it is designed, but spares are cheap enough.

All in all for a heli, it's pretty durable and reliable. About on par with a raptor 50, quite a bit better than the t-600's at the field. It's been a lot more reliable than my hirobo evo 90, but the high torque sprag clutch fixed that heli pretty well.

My suggestions for K3D owners would be:

1) put a little thin CA on your clutch liner to make sure it doesn't eject like mine did.

2) If you're using the black main gear and doing a lot of stick banging, keep a spare main gear on hand, preferably the white one.

I got a fever! The only prescription is MORE 6HV

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06-09-2009 11:57 PM  8 years agoPost 15
JAGNZ

rrProfessor

Auckland, New Zealand

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Apart from that frame spacer all of your issues have been addressed in the newer kits. IMHO the 3D will be more durable than a Raptor over the long haul. The design is vastly superior too, from the control system to maintenance layout. Plus it's lighter and the stacked frames just look nicer IMO.


Jason Greenwood

www.3dheli.co.nz

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06-11-2009 12:53 PM  8 years agoPost 16
leadlag

rrVeteran

Worthing UK

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Easier to maintain and lighter and more agile but superior control system I would not agree.

The Raptor control system has no interaction but makes for a more complicated and heavier heli and is harder to design and more expensive to manufacture. This the reason everyone else has gone for E-ccpm. E-ccpm however has interaction no matter how well designed and mixed.

The Knight 3d with the raptor control system would be a the perfect 50.

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06-11-2009 01:28 PM  8 years agoPost 17
JAGNZ

rrProfessor

Auckland, New Zealand

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This the reason everyone else has gone for E-ccpm. E-ccpm however has interaction no matter how well designed and mixed.
I disagree. 100% of the interaction can be programmed/mixed/adjusted out. As long as you use a Swash Leveler you can get it perfect.


Jason Greenwood

www.3dheli.co.nz

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06-11-2009 01:35 PM  8 years agoPost 18
TheBum

rrVeteran

McKinney, TX

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I disagree. 100% of the interaction can be programmed/mixed/adjusted out. As long as you use a Swash Leveler you can get it perfect.
I would qualify this by saying that it's true for helis that use bellcranks to the swash and direct-to-swash helis that have a same-height cyclic servo arrangement, particularly for the aileron/pitch servos.

However, direct-to-swash helis with a stacked servo design will always have minute interactions because the linkages are different lengths and, therefore, ascend and descend at different angles. Yes, you may be able to get the interactions out at center collective and at full positive and full negative, but you'll likely have interactions in between. Will they be bad enough to matter? Probably not.

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06-11-2009 01:39 PM  8 years agoPost 19
JAGNZ

rrProfessor

Auckland, New Zealand

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Yes, you may be able to get the interactions out at center collective and at full positive and full negative, but you'll likely have interactions in between.
Maybe but these can also be mixed out with programmable mixes....it's even easier with modern radios that automatically compensate VERY well in 120deg CCPM mode.


Jason Greenwood

www.3dheli.co.nz

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