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Ron’s HeliProz South . Century Helicopter . MTA Hobbies

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Radio - Servo - Gyro - Gov - Batt > TX/RX eCCPM Latency Test Results
 
 
AirWolfRC
Elite Veteran
Location: 42½ N, 83½ W

Quote 
The whole thing about failsafe is to save YOU and the spectators, NOT the aircraft! If the throttle doesn't go to a predefined position when control is lost then the system is dangerous! Period!
My point is that fail-safe or not, you DO NOT have any different level of confidence of where the craft is going to go. The only possible comfort is low throttle on lost signal.

My point is people put way too much faith in fail-safe.
Just because the word contains the letters "safe" dosen't mean it is.

If you want real confidence, hook the fail safe up to explosive separation of the rotor
06-20-2008 11:52 PM
HOMEPAGE  
 
 
TMoore
rrProfessor
Location: Cookeville, TN

Quote 
What you quoted is not opinion, simple facts of the system. Perhaps you meant to quote my assessment of the failsafe solution.

Failsafe is not about how the system operates under normal conditions; it's all about the time something goes wrong. That's when you'll find out what the failsafe solution really means.

Are you willing to turn off your tx and find out what happens? If you feel so strongly that the system is safe, go for it and please let us know how it turns out.

With regards to CCPM setup, again, simple fact of how the radio works. It is what it is and I did not say it was good or bad. Notice I said, "A few tidbits..." and then listed facts.


You turn off your TX John. I don't want to turn off mine and I think it's somewhat moronic to suggest that. Do you honestly think you can turn off a DX and just watch the model sit there and go about its merry way while you scratch your ass in amazement? I don't want to be there either. The bottom line is that when sh*t goes wrong, models crash. I've seen it too many times with a lot of different equipment and failsafe almost always means dick.

Airwolf has it right. Failsafe is no real answer and while John may diasgree with Sanwa's implementation of it, that is his choice. So far, I have had no issues. When either the TX or the RX battery fails, the model will crash. There isn't any good way to stop that. Certainly not that I've found. I had a new EVO 90 go in running full PCM with failsafe set and the heli still dove to the ground when faced with radio interference. Failsafe doesn't work all the time. Personally, I like the fact that the RD using hopping technology. I think Sanwa's choice of this modulation scheme is a good one and provides a certain level of security of its own, maybe even safer than failsafe.

How many of those socalled secure failsafe equipped radios have crashed due to power issues? Did failsafe protect the users or the models? I think that most of them crashed and went boom when the power ran out.

Another issue is the constant harping about the RDS' CCPM functions. They are what they are. If you don't like them, don't buy the radio. There is not a single CCPM scheme that I have unable to make either the Stylus or the RD series do. Just because the radio doesn't work like another radio doesn't mean that is automatically a poor implementation. There are a lot of things that I don't like about a lot of radios but by and large there are a lot of good ones on the market and I spend a lot of my time helping folks to get the best out what they have in their hands and not necessarily telling them that what they bought isn't good enough.

There are still folks that can't get their 7 channels to work with gyros and governors and this is very much of a non issue with the RD series but no one seems to point that out because negative sounds spicier and flashier. With the RD, I don't need to push two buttons at the same time just to change models, power on and off or push those same two buttons to just get into the menus. I don't need a special TX case because the antenna folds up inside the Transmitters own space and still uses standard size TX cases.

There are a lot of features that the RD has but in the end I thought this thread was about latency and speed of the system. In that context, the RD acquits itself quite well, espcially at its price point and that's my opinion which the numbers seem to back up.


TM

"If you can do it, it ain’t bragging." - Will Rogers
06-21-2008 12:49 AM
 
 
wileyeco
Heliman
Location: owosso mich usa

i use the rds 8000

and have had no troubles with it, failsafe off as it will not help a heli to chop the thottle and center the control surfaces anyway, nor in my 20 plus years of flying airplanes either. no problems setting up and centering cyclic servos here. and yes thank you again john for your hard work.
06-21-2008 01:17 AM
 
 
lazy-b
Heliman
Location: Manila, Philippines

John,

I just notice you did not test the Latency of Futaba 8UHP, have read the test report of W. PASMAN, he tested the Latency of Futaba 8UHP is 74.4 msec. compare to your test of Futaba 9CHP 83.4 msec........this means the old model 8UHP is Faster than the newer 9CHP, I guess this is due to more channel in 9CHP.

or you might have the different procedure as W. PASMAN.

Hope you can also test the Futaba 8UHP or 8UHPS.

after reading your report, I just sold my 9CHP and purchase a Spectrum DX7.
07-06-2008 06:51 AM
 
 
GimbalFan
Elite Veteran
Location: Copter County, Nv

Quote 
after reading your report, I just sold my 9CHP and purchase a Spectrum DX7.
Another example of the value of the knowledge which has been posted for over three years on this thread.

Let us know your perceptions of the differences in 'feel' between the two.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t
07-06-2008 07:07 AM
 
 
UAVO
Heliman
Location: Houston, TX - USA

Very cool to know. Thanks.
07-11-2008 09:28 AM
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

Quote 
If you want a 2.4 GHz radio with full independent channel fail-safe (ubiquitous in the the 72 MHz PCM days), then Futaba is the only game in town.

Futaba gives you a lot but it's not cheap.

"Any man who says he is an American, but something else also, isn't an American at all.
07-11-2008 09:46 AM
HOMEPAGE  
 
 
Four Stroker
Veteran
Location: Atlanta

"I just notice you did not test the Latency of Futaba 8UHP"

Hey, John never tested the latency of the 9VHP either ?

I think John only tests radios that you can buy! NEW! If you will send him yours, he might test it just for grins.
07-11-2008 02:29 PM
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

I'll test any radio someone is willing to send me; I've always said that. I don't think I've ever even seen a 9VHP.

- John

Protos -- Logo 10
07-11-2008 03:47 PM
 
 
Four Stroker
Veteran
Location: Atlanta

The 9VHP came out some 20 years ago. It was the predecessor to the 9Z. It was the first real computer radio but oddly enough still had a set of (redundant) trim pots for the transition. It did not have flight conditions and for some odd reason you could not set V throttle curves - only strictly increasing points left to right. You could get around this by using two mixers. It did have 12 point curves with graphs. The manual is still on the Futaba site.

For this thread it had the distinction of having about 1/4 of the CCPM swashplate bobble as the 9Z using the exact same PCM 1024 and Channels 1,2,6 with the same receiver. This leads to my previous statement that the poor CCPM performance is not due strictly to the latency and the channel 1,2 and 6 split.

Futaba now has perfect CCPM on the 12/14 radios when used with the FASST MULT 608 and 6014 receivers as previously discussed. Even F3C/FAI flyers are starting to use CCPM now. 2048 resolution helps.
07-11-2008 04:51 PM
 
 
Joshuadog
New Heliman
Location: Madison, Ohio

New Futaba Fast Systems

Have the 12FG and or the 10C systems been checked out yet ? I'm considering a new radio purchase. Thanks
07-31-2008 02:41 AM
 
 
baby_zyklon
Key Veteran
Location: Singapore

any chance of testing the latency of the 10C system?
08-20-2008 10:01 AM
HOMEPAGE  
 
 
Mike545
Heliman
Location: gettysburg, pa

did i read this wrong? that the 7c is faster than the 9c and close to dx7? does this radio offer features close to the 7c?
08-26-2008 08:27 PM
 
 
48 pages [ <<    <     46      47     ( 48 )    >    >> ]74976 viewsPOST REPLY
Model Rectifier Corp . PowerHelis . JR-Spektrum

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Radio - Servo - Gyro - Gov - Batt > TX/RX eCCPM Latency Test Results
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