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T-REX 700 › 700E DFC Dampers, boom strike.... a conclusion ?
08-07-2012 02:37 PM  5 years agoPost 1
HarveyR

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France - North

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I've just read through a long thread below but I've not managed to fully clarify if the boom strike issue is anecdotic or not, and if not what should be done to solve it?

I understand that in all cases you're better off with the aluminium boom than "all show no go" carbon sticker boom and that we should tighten the blades more than usual (??? just how tight is that, how could one test if it's right ???), but what about the dampers, can we use the stock ones or not?

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08-07-2012 02:57 PM  5 years agoPost 2
Richardmid1

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Leeds, England

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Don't they now come with harder dampeners to prevent boom strikes?

Blades shouldn't droop when holding the heli in its side with the blades horizontal and shaking it a little.

60% of the time, it works every time!

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08-07-2012 06:44 PM  5 years agoPost 3
HarveyR

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France - North

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Don't they now come with harder dampeners to prevent boom strikes?
It's not mentionned on the description on the site where I plan to buy from, I guess I could phone up... what are the details (what's the part reference the guy should check for, or how can he see if it's the old or new dampers?)
Blades shouldn't droop when holding the heli in its side with the blades horizontal and shaking it a little.
That's already what I do to tighten the blades on my regular heads (FBL or not)... do you mean that I should do this then tighten a little harder?

Thanks

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08-07-2012 07:19 PM  5 years agoPost 4
T-rexn8

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CoLoRaDo

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You can run a carbon boom just fine. New DFC kit comes with a carbon boom.

The original "boom strike" stories occurred when a user did not fully tighten the bolt that holds the linkage to the blade grip and sh*t got blown out of proportion

Xxtreme 800, TDR, 700E DFC, Mini Protos, T-450 DFC, Blade 130x, mcpx, nano

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08-07-2012 07:24 PM  5 years agoPost 5
adamsz06

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Geilenkirchen Germany

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Aren't the carbon booms for the 600 and 700 carbon wrapped aluminum? They've always seemed plenty stiff to me...

R.I.P. Roman

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08-07-2012 08:04 PM  5 years agoPost 6
Rick_H

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Boulder City, Nevada

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How many other threads have you seen since the one you read complaining about their 700e DFC boom striking?

So far it looks like an isolated setup issue.

Tighten the blades so that they will not move if you give your heli a good shake. You should still be able to fold them without having to loosen them any for storage.

Rick

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08-07-2012 08:05 PM  5 years agoPost 7
T-rexn8

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CoLoRaDo

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Yup the booms are carbon wrapped aluminum.

Xxtreme 800, TDR, 700E DFC, Mini Protos, T-450 DFC, Blade 130x, mcpx, nano

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08-08-2012 09:12 AM  5 years agoPost 8
HarveyR

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France - North

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OK... so nothing to worry about as long as I tighten the blades well (can some detail be given here? For example, should I tighten them so they hold even when I shake hard with the heli on the side?).

Thinking back, this is a bit like the main gear and tail rotor issues on the V1 TREX 700E. I was all worried about my tail falling appart or the gears stripping or the CC ICE going up in flames, and now about 350 flights later (with a fully stock V1 TREX700E with ICE V1!) I've had absolutely non issues at all (and not one single crash)! The best heli I've ever had I'd say!

So, normally by Saturday I'll be receiving a 700E DFC HV top combo (and probably a 250 DFC too). I'll be back if I have any building issues, but I guess it's very similar to the 700E V1.

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08-08-2012 09:18 AM  5 years agoPost 9
adamsz06

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Geilenkirchen Germany

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Just snug the bade bolts down so that when the heli is held sideways, it take a healthy shake to get the blades to move.

R.I.P. Roman

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08-08-2012 10:22 AM  5 years agoPost 10
HarveyR

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France - North

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OK, that sounds clear... I'll basically do the same as usual but shake a little harder than usual. Thanks. I've just ordered the RX and WR BEC. The combo is next on the list!

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08-10-2012 01:08 PM  5 years agoPost 11
Dino Spadaccini

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USA

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adamsz06 is on point the boom strike was due to loose blades, you need to keep the mains very snug and you not have any issues.

RIP Roman JR
Capt USA Align Factory Team Align - Conquer Your heart
Team Futaba

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