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HomeAircraftHelicopterHelicopter Main Discussion › Has anyone tried the overdrive ?
02-02-2010 05:25 PM  8 years agoPost 21
Pistol Pete

rrProfessor

Seffner, FL

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Great gadget, no doubt.

So in essense this picks up where many radios fail or lack. So it may be just a matter of time before manufacturers make up for it. I see its value at this time IF into competitions, otherwise purchase more lipos or nitro.

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

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02-02-2010 05:28 PM  8 years agoPost 22
Jeff polisena

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westpalmbeachflorida usa

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Look for my posts if I don't like it , it will be for sale

I stole it ,flew it and gave it back ;)

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02-02-2010 07:27 PM  8 years agoPost 23
rotormonkey

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Ottawa, ON - Canada

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imho this little gadget has value far beyond competition. If it transforms el cheapo servos into high torque high speed beasts as it's supposed to there's a huge benefit alone. Even your Joe average sport flier will be able to tell the difference there.

My ONLY concern with this little gadget would be plugging it in with an FBL unit. On a flybarred heli I would expect it to make a helluva difference. Especially with cheaper servos.

If it can't hover, it ain't worth flying.

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02-02-2010 08:02 PM  8 years agoPost 24
Pistol Pete

rrProfessor

Seffner, FL

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It will not give digital servos higher torque but definitely faster response and synchronization, another plus.

"El cheapo" servos such as analogs, can not be used with this device.

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

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02-02-2010 09:00 PM  8 years agoPost 25
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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There have been people using it with flybarless, though i have yet to hear about the results. mainly because...well...lets face it, this isnt exactly the perfect time of year to be testing a new heli product. But i do know it works.

The Overdrive is meant to go between the flybarless and the servo's.

The flybarless system is simply reacting to what is happening. with the overdrive, your servo's should react quicker then normal, still adding a bonus in performance. example, going from lets say an old 9253 tail servo, to a BLS251. the BLS251 being far faster and more powerful, both do the same job, and both can operate on the same gyro. But now your gyro can be used to its full potential. Will you notice it hovering around? not likely, but start banging the sticks around and make her scream, and you will.

But, how much of a difference you will see is unknown to me. on my 90 with the better servos, the time i noticed it most was during very quick aggressive moves. if your just hovering or doing loops, you will not likely feel the effect.

Here is a picture of an Overdrive on a Century Radikal G20. I will post pics later on of the Overdrive on my own machines. It has a relatively small foot print, and the long leads make it easy to find a home for it.

Note in the picture the overdrive is being used with a flybarless system

Shawn
Team Leisure-Tech
Team HelixRC

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02-02-2010 09:10 PM  8 years agoPost 26
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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It will not give digital servos higher torque but definitely faster response and synchronization, another plus.
Common miss understanding, this has created some heated debates already. This was the main reason for my scope tests on a servo to prove the concept.

in summary. yes, it does increase torque, but not the way you think it does.

When a servo is given a pulse, it does what it can to go to its position, but only during that pulse. on the standard radio systems running 20ms pulse rate, there is a huge gap between pulses. While the servo is not getting a pulse, it does nothing, it sits there completely unpowered, you can make it do what ever you want while the servo is not getting that pulse. therefore, if the servo is under a load, it will actually get pulled back/slowed down between the frames.

increasing the pulse rate is like cracking the whip, it doesnt give the servo much time to do what gravity tells it to do in between pulses.

so, you are right, to a point. the motor in the servo will only create X amount of torque, period. But, that is not the full story.

Here is a youtube video someone made to help demonstrate the point. the servo is only getting a pulse once per second. in between that one second pulse, the servo can be pushed around by what ever forces acting on it. Just imagine this happening on the helicopter, but much quicker.

Watch at YouTube

Shawn
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02-02-2010 09:22 PM  8 years agoPost 27
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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Just noticed some confusion with the Truesync.

Spektrum radios do not sync the swash servos, they are simply grouped together.

each channel gets a command one at a time. on an FM system it may be something like throttle, elevator, rudder, aileron, gear, aux1, pitch. ect.

Spektrum radios will take the 3 swash channels, and sends them out one after the other, so it will be something like Aileron, Pitch, and elevator, followed by the others.

The Overdrive is actually taking those 3 channels, and sending all 3 out at the same time.

Normal spektrum signal

And here is what it looks like with the Truesync.

Then here is both in one image. note the higher pulse rate on the top set running the overdrive.

Shawn
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02-02-2010 09:29 PM  8 years agoPost 28
cbflys

rrVeteran

Nesconset, NY - USA

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Spektrum radios do not sync the swash servos, they are simply grouped together.
This isn't entirely true, it depends on the TX/RX.

See here:
http://www.rchelimag.com/pages/scop...scope=32&page=1

You'll notice when a 2048-step resolution receiver is used with a DX7se, channels 2 & 6 are sync'd, followed by channel 3; sort of a hybrid sync/grouping combination.

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02-02-2010 09:35 PM  8 years agoPost 29
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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The images i have shown are from the standard DX7, which works different then the DX7 SE, this is why i mentioned in a previous post that the Overdrive currently does not work with the SE, likely for this reason.

Shawn
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02-02-2010 10:22 PM  8 years agoPost 30
LaurenceGough

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UK

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I take it that the JR 8717's do not use the incoming signal framerate to drive the motor directly then?

Sometimes I wish they would add some more specifications to products..

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02-02-2010 10:24 PM  8 years agoPost 31
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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you mean to have the servo independently hold its last known position without getting another signal?

Shawn
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02-02-2010 10:29 PM  8 years agoPost 32
LaurenceGough

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UK

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Yes, sorry. I can never word stuff correctly.

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02-02-2010 10:34 PM  8 years agoPost 33
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i honestly have no idea. perhaps there are servo's that do it. But i am not certain if the 8717 is one of those.

Shawn
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02-03-2010 11:30 PM  8 years agoPost 34
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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The Overdrive SX stuck to the side of my Century NX50.

The one on my 90 is under some foam all wrapped up.

Shawn
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02-04-2010 03:19 AM  8 years agoPost 35
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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Shhh...dont tell anyone.

I'm testing out another version of the Overdrive for 450 machines

Shawn
Team Leisure-Tech
Team HelixRC

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02-08-2010 09:58 PM  8 years agoPost 36
Jeff polisena

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westpalmbeachflorida usa

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+1 Furious Predator
I noticed it the most on hard 3d

On dx7 se it does not work or will not make a difference ? I will rebind to se and see .

I stole it ,flew it and gave it back ;)

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02-08-2010 10:15 PM  8 years agoPost 37
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i dont have an SE myself, i have just been told by the designer that during testing, the Overdrive would not work, what exactly happened i am not sure. I am told the solution is in the works.

Shawn
Team Leisure-Tech
Team HelixRC

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02-08-2010 10:28 PM  8 years agoPost 38
Jeff polisena

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westpalmbeachflorida usa

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Well we will see this s how we learn

I stole it ,flew it and gave it back ;)

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02-08-2010 10:35 PM  8 years agoPost 39
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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let us know

i can forward the feedback which might help.

Shawn
Team Leisure-Tech
Team HelixRC

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02-10-2010 11:59 PM  8 years agoPost 40
Jeff polisena

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westpalmbeachflorida usa

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I think you get to a point that electronics only do so much , if you take with fast comunication and pair it up to other fast equipment you get to a point where it is as fast as it gets . No matter what I do with over drive ,vbar and tx (dx7/dx7se)besides make vbar out of controll I'm at the fastest , best controllable heli. Yes I'm sure if you hook up analizing equipment you will see a difference but as I fly all is same or close . Sorry for explination I'm not good at translations of techinal info

I stole it ,flew it and gave it back ;)

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HomeAircraftHelicopterHelicopter Main Discussion › Has anyone tried the overdrive ?
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