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Home✈️Aircraft🚁Helicoptere-BladeBlade 400 › Blade 400 jumps when chopping the throttle.
04-02-2013 09:14 PM  6 years ago
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DougPenhall

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San Jose, CA - USA

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Blade 400 jumps when chopping the throttle.
I'm using a DX7 with a Blade 400 3D. I tried to hover it, and it seemed to be working fine, but then when I chop the throttle off before dropping the Blade 400 jumps up. The first few times it jumped about a foot, but the last time it seemed to be having trouble lifting off as the rotor was speeding up more than on my previous attempts. Then when I chopped the throttle it jumped up about 10 feet. This seems dangerous so I'd like to fix it before attempting to fly it again.

It seems like it's refusing to increase the pitch, but then when I suddenly chop the throttle the pitch increases before the rotor blades have time to slow down.

Has anyone seen similar behavior with a DX7 and Blade 400, or with any other combination of helicopter/transmitter? Any ideas as to what might be causing this?
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04-02-2013 09:32 PM  6 years ago
jason46

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MI

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I'm not exactly sure what you mean by chopping the throttle, but your throttle hold pitch curve may be different than the one you are using to hover.
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04-02-2013 09:50 PM  6 years ago
DougPenhall

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San Jose, CA - USA

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"chop the throttle" = "move the pitch/throttle control lever down really fast to turn off the throttle"

I'm not using the throttle hold switch (or any other switches) to, "chop the throttle", so I shouldn't be changing throttle or pitch curves when I, "chop the throttle".
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04-02-2013 11:41 PM  6 years ago
onebigjunker

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Wellsville, Ks

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check to make sure your pitch is going in the right dirrection, my buddy bought a new on back in the day and the pitch was reversed in it, caused me a crash trying to help him, because I didnt check it.work hard, play even harder!!!!
Team Empire Hobby/GAUI USA
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04-03-2013 12:02 AM  6 years ago
DougPenhall

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When I set it up I checked it with the motor wires disconnected and the swash seemed to be operating correctly with all the controls (collective/throttle, aileron, and pitch). I'll have to check again to reverify when I'm back home. I'll also check to see what happens when I gradually raise the collective/throttle control, then suddenly drop it back to zero to see if I notice anything suspicious.

It seems that I am able to hover it fine. It's just scary when I drop the collective/throttle to 0 and the thing jumps in the air instead of dropping to the ground.
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04-03-2013 12:05 AM  6 years ago
onebigjunker

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Wellsville, Ks

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you could of put your pitch curve in a v in stead of a straight line, might of got throtel and pich confused when you were doing it!work hard, play even harder!!!!
Team Empire Hobby/GAUI USA
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04-03-2013 05:12 PM  6 years ago
bldfrt

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elkland, pa

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+1 on the pitch curve in a v shape. happened with my b400 and dx6i.Have fun, Fly safe!!
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04-03-2013 09:11 PM  6 years ago
jschenck

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La Vista, NE.

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disconnect two of the leads to the motor from the ESC. This will allow you to try out the pitch in flight mode without the motor running. you can disconnect just one of the motor leads but the motor might jump a bit as you throttle up.

Then run the throttle/collective up and down. Make sure the swash is moving as you'd expect it to. switch between flight modes and make sure the swash doesn't jump. Really important it doesn't jump especially when you hit throttle hold.
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04-04-2013 12:02 AM  6 years ago
DougPenhall

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Ok, I had the throttle/collective backwards. It was able to generate enough lift to hover, but when I would pull the throttle down the pitch would increase before the rotor blades could slow down generating enough lift to cause the thing to jump in the air before landing.

Thanks for the help.
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04-04-2013 12:26 AM  6 years ago
jschenck

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La Vista, NE.

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reverse that by going into the swash mix and changing the collective from
+ to -
or
- to +
keeping the same % numbers.

I would suggest verifying your total collective and cyclic pitch throws with a pitch gauge.
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04-04-2013 03:32 AM  6 years ago
DougPenhall

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I had to reverse some servos to get the proper pitch direction, then reverse the swash mix to get aileron and elevator in the right direction. Alls good now.
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04-04-2013 04:15 AM  6 years ago
onebigjunker

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Wellsville, Ks

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good luckk, glad you got it fixed, have fun!work hard, play even harder!!!!
Team Empire Hobby/GAUI USA
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04-14-2013 12:18 AM  6 years ago
stubbs

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Tuscon, AZ

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Remember that the swash moves backwards, as compared to almost all other CP helis. Because of main blade trailing edge control, the swash moves DOWN when moving the collective/throttle stick up for increasing pitch and vice versa.
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04-14-2013 07:23 PM  6 years ago
jason46

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MI

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It is possible to reverse the swash mix and flip the grips and run leading edge, this was how I ran my B400.
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04-14-2013 09:32 PM  6 years ago
stubbs

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Tuscon, AZ

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It is possible to reverse the swash mix and flip the grips and run leading edge, this was how I ran my B400.
True, but other than "looking normal", you gain zero benefit from doing that. It is a zero delta head so trailing versus leading edge control doesn't matter. For those disbelievers, ask the designer Mikel Graham (he's on FB) or do the research yourself...
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04-15-2013 02:17 AM  6 years ago
jason46

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MI

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I think that would be true if the head were solid, but when the shaft loads the dampeners the leading edge should give more stability. However, I mostly just screwed the heli into the dirt, so I could be wrong.

The original head on the b400 with only two O-ring for dampening had all kinds of deflection.
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04-15-2013 04:19 PM  6 years ago
stubbs

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Tuscon, AZ

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Like I said...talk to the designer about it... Believe it or not, he actually responds, unlike a lot of other "employees".
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04-19-2013 07:29 AM  6 years ago
DougPenhall

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San Jose, CA - USA

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Remember that the swash moves backwards, as compared to almost all other CP helis. Because of main blade trailing edge control, the swash moves DOWN when moving the collective/throttle stick up for increasing pitch and vice versa.
That's exactly why I originally set it up backwards. I hadn't realized the swash direction was backwards and the manual has no instructions for how to set up the 400 with my DX7. The mCP-x and 130x have some really nice tables of settings for several TXs making it really simple, but the 400 manual appears to assume you'll never use anything but the controller that came with it. I bought this used without the TX, and this is the first heli I've had to set up without clear instructions and the first heli I've seen that has a swash that is the reverse of all my previous helis.
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04-19-2013 01:03 PM  6 years ago
jason46

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MI

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Manuals can be found here. http://www.e-fliterc.com/Products/S...FLH1400#manuals

The dx6i settings should be close enough to work. The important thing is the swash settings are not symmetric because of the pitch rocker arm.
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04-19-2013 03:33 PM  6 years ago
stubbs

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Tuscon, AZ

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That's exactly why I originally set it up backwards. I hadn't realized the swash direction was backwards and the manual has no instructions for how to set up the 400 with my DX7.
Manual or not that, right there, is why you should always "waggle the sticks" when doing a set up to see if everything looks right and simply makes sense with regards to things physically moving in the correct directions. One look at the actual blades (not the swash) when moving the collective will tell you all you need to know about it moving correctly. That said, I still don't see why Blade/E-Flite had to be "different" and have trailing edge control with the swash moving "backwards", as compared to virtually ever other CP heli out there. There was absolutely NO reason for that when they designed the B400. The designer of the later Blade 4503D and 450X helis (Mikel Graham) said he brought this up to Blade, but they didn't want to change the B400 head design because of laziness and expense of retooling. Still doesn't explain why the original B400 started with a "backwards collective" from a clean sheet, though.
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