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T-REX 700 › kdd tail blades
12-06-2015 01:36 PM  32 months agoPost 1
bobbyshafter

rrApprentice

ny,usa

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Any one tried kdd tail blades

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12-08-2015 03:02 PM  31 months agoPost 2
Richardmid1

rrProfessor

Leeds, England

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You mean KBDD? If so, save a bit more and just get carbon, far superior.

60% of the time, it works every time!

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12-08-2015 05:30 PM  31 months agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

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+1
KBDD EXTREME tail blades...can't beat them.
HIGHLY visible, durable and wearable.
Tall grass no issues.
Blade strikes? Sand nick down, rebalance if necessary and go again.

I drag tail on sliding autos over grass for fun. I've worn carbons doing same.

~~Enjoying the hobby one flight at a time~~

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12-08-2015 07:56 PM  31 months agoPost 4
jason46

rrVeteran

MI

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I started using KBDD blades on my warp where I was chewing up carbon blades landing and taking off, and they actually work really well.

I'm also using KBDD blades on a lepton that needed a 70mm blade with a 4mm root...

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12-09-2015 07:59 AM  31 months agoPost 5
Heli Fanatix

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Fountain Valley, CA

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KBDD blades will work, just make sure you use the extreme versions. But be careful, sometime the KBDD's will weight more than the CF.

Reason why I mention this is b/c if you have plastic tail blade grips like the Logo or 7HV, they will stress it out when running at high HS. For your Trex 700 and other ones with metal blade grips .. you are good to go!

I use them on my Logo 500SE for autorotations:
- if it gets scuff..I'll sand it and balance
- if it gets chunks missing... I epoxy, file, wetsand, polish, balance and it's go time!

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12-09-2015 08:13 AM  31 months agoPost 6
Richardmid1

rrProfessor

Leeds, England

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The extreme ones are better but still not as stiff as carbon. Durability is excellent though.

60% of the time, it works every time!

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12-09-2015 01:10 PM  31 months agoPost 7
jason46

rrVeteran

MI

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Helifanatix, I'm skeptical about your statements on multiple levels.

Anyone have a good scale and a set of KBDD and carbon blades? By the time paint/clear coat epoxy and brass inserts are added to carbon blades seems the wight difference would be negligible. The 70mm blades are the largest KBDD blades I've used, comparing similar sizes to carbon blades weight wasn't a concern.

Has a tail grip ever broken in flight?

Seems if you were going to fault these for anything it would be rigidity, but as mentioned the extreme versions are pretty damn stiff.

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12-11-2015 09:47 PM  31 months agoPost 8
Heli Fanatix

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Fountain Valley, CA

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Jason,

Before I begin ... Your experience is only with the smaller heli's and until you start getting into the bigger heli, the force and demands are increased significantly.

104mm KBDD and bigger plastic blades may weight more than the CF. I did weight it already to confirm it. I can update with exact specifics if need be. I fly Logo 600 and Compass 7HV, their tail blade grips are plastic and will fail by
- hitting a certain RPM
- weight of the blades
- very compromised if using heavier blades with high RPM

I know for a fact you will chuck any blades with the Logo plastic tail blade grips if HS is 3,000. I has happened to me 3 times. Plastic blade grip broke with 86mm mikado plastic blades. This has also happened to Jessie from RCHN, he talked about it on of the episode with his compass 7HV.

The idea of CF weighting more might be the first thought that cross your mind, but they are hollow and the density of the KBDD extremes is the side effect of being stiff. Now if you have metal blade grips, by all means use anything you like. The CF do give more tail authority and crisper tail response. I use a at on my birds I don't auto.

All my information are from:
- trail an error
- experimentations with multiple controls
- my 400+ flights per month routine

I have used KBDD on all my smaller heli with no issues. Granted I fly lower to moderate HS and they all have metal blade grips except for my logo. I have hit 2450 HS with 96mm KBDD extremes with no problems either. I'm not a key board commando or make up materials just to stir the pot. I'm just sharing my experiences and try to help inform members. Sometimes try to keep it short and point someone in the right direction. Check all my post ... All the information is accurate. Now if someone feels I'm not, than present their opinion(s) that are based on facts please.

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12-11-2015 11:53 PM  31 months agoPost 9
jason46

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MI

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I've had a few 600s. Running at 3000rpms seems could cause more than grip failure and I don't think is common place, probably should have been disclosed.

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12-12-2015 12:11 AM  31 months agoPost 10
Heli Fanatix

rrVeteran

Fountain Valley, CA

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Running 3000 was a test for plastic & metal tail blade grips.

I can not pin point or spell it out and cross every T or dot every I. Too many bases to cover. I'm just bring it up b/c it does happen: Rare or common place. now after knowing this, if you do the research and diligence .... Than you will understand why.

Jason, looks like got more questions than answers on this forum, and still doing it.So I will try my best to satisfy your demand.

Plastic grip will fail but not metal. I have sucessfully ran up to 3450 with 116mm CF and 116mm plastic with no problems. It does happen ... Here are the details

Logo 600SE with 105mm with stock tail blade grip at more 2000 (on the none 690SX tail gearing)... You are asking for it
7HV - up to 2300 HS with 105mm CF / 2150 with 110mm plastic (plastic tail grips failed with plastic @ over 2200 HS - twice)
JR Forza - up to 2348 with 116mm CF
Trex 700 - up to 2200 HS with 110mm CF
Goblin 700 - up to 2300 HS with 116mm plastic or CF

So the ones to watch out are the plastic tail grips. For the smaller heli, not much of a factor since the size and weight of the plastic blade grips arent much of an issue. It's the 700 class heli's

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12-12-2015 12:31 AM  31 months agoPost 11
don s

rrElite Veteran

Chesapeake, VA

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Used plastic and carbon. Both work, but carbon works better.

My opinion of course...

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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12-12-2015 02:01 AM  31 months agoPost 12
jason46

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MI

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There would not have been any question if you had mentioned the condition of 3000rpms in your initial blanket statement. It is helpful to have such details up front.

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12-12-2015 02:32 AM  31 months agoPost 13
Heli Fanatix

rrVeteran

Fountain Valley, CA

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Jason,

Did you not see me mentioning that KBDD can cause plastic tail blade grip failures at less than 3000 for Logo and Compass plastic tail blade grips or did you loose objectivity and in the business of beating dead horses? I used the word "compromised" and other terms as to not exaggerate for your sake.
I provided lots of other examples and listed my findings to support it, yet you still had to refer about the 3000 HS again (something I had already addressed). My initial blanketed statement was in reference to the Logo and 7HV, not the 3000 HS failure.

* I do hard reversals that exert a lot of force on the plastic blade grips. The instantaneous deflections and having heavier tail blades just forces the issue. if you don't do reversal ... Than it should be fine for the most part.

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12-12-2015 08:16 AM  31 months agoPost 14
Richardmid1

rrProfessor

Leeds, England

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2200+ is very high head speed on a 700 and 110mm+ tail blades are too long for such head speeds!

So if you know what you doing and use common sense, kbdd tail blades with plastic grips is completely fine.

60% of the time, it works every time!

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12-12-2015 01:49 PM  31 months agoPost 15
jason46

rrVeteran

MI

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Scott,

All I'm trying to say is you did not qualify your statement in your initial post with the unusual condition and it could have been misleading.

For example.

Plastic blades are heavy causing plastic grips to stress at high head speed...
I don't really agree with that.

Using plastic blades at 3000rpms causes plastic grips to stress maybe break...
Sure, I would probably agree with that.

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12-12-2015 05:50 PM  31 months agoPost 16
Heli Fanatix

rrVeteran

Fountain Valley, CA

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Jason,

- Have you ever owned a heli with plastic tail blades?
- Do you use KBDD 104mm or bigger with them?
- Do you do any aggressive rudder reversals?
- Do you fly the KBDD on 700 class machine at 2200+ HS with KBDD?
- Do you listen to RCHN? If any member has listen to Jessie's situation with the KBDD on his Compass 7HV ... let us know

There comes to a saying,
"just b/c you don't believe it .... doesn't mean it's not true"

I speak from experience, why would I make it up?

There are things that you would not expect to hear such as:
- main blade bolts sheering on 600's
- static discharge on torque tube drive
- CF 690's main blades snapping near the roots from normal flying

Some you might of heard, others may sound far fetch, actual level of knowledge is based on the number of experiences and not time in the hobby. But they are all in the realm of truth.

I said it once, twice and even a third time. I'm done on this matter. Good day sir

Time to pull some electrons!!!

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12-12-2015 06:15 PM  31 months agoPost 17
jason46

rrVeteran

MI

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I wasn't refuting anything you said, all I was asking for was clarification on your first post lol... also welcome to my i-list, nothing you have to say is worth the time to read.

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12-12-2015 10:28 PM  31 months agoPost 18
Richardmid1

rrProfessor

Leeds, England

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What the **** is a 7hv?!

60% of the time, it works every time!

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12-12-2015 10:31 PM  31 months agoPost 19
Heli Fanatix

rrVeteran

Fountain Valley, CA

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Compass 7HV

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12-12-2015 10:39 PM  31 months agoPost 20
Richardmid1

rrProfessor

Leeds, England

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I was just joking.

60% of the time, it works every time!

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