Trex 500 Build Videos

[Pinecone]

The problem is, for a newbie, you tell them about reversing to get the swash moving the right way, and then they get confused with aileron or elevator move backwards and try to fix it via servo reversing.

And since it all comes out the same in the end, not a big deal, do it either way.

But I agree with Bob, the quickest and easiet to understand is get them all moving together, THEN worry about the direction.

[ducati996]

Bob:

I told you this before but YOU ROCK! I had been flying airplanes for 16 years and with Bob's videos I was able to put a 600N together in such a way that my friends were stunt how well it came out. Needless to say that I did not even know what CCPM was and where to connect what. Bob's videos are very clear and extremely helpfull. Usualy people who use these videos need the help. If you know what to do then do it and stop picking the videos apart, others like myself realy need his help to get it right.

Thanks Bob...looking forward to the 700 Build videos :-)

[psindrup]

I think you are getting me wrong.

I was just trying to understand why it was done in that order - not to question if it worked or not.

What is logical for you is not necessarily logic for me, and vise versa. :YeaBaby:

I will refrain from this type of questions in the future ...


Best regards

Peter

[Finless]

I think you are getting me wrong.

I was just trying to understand why it was done in that order - not to question if it worked or not.

What is logical for you is not necessarily logic for me, and vise versa. :YeaBaby:

I will refrain from this type of questions in the future ...


Best regards

Peter

Peter... PLEASE don't refrain from asking questions! You are right man and please don't think people are jumping on you supporting me OK!
I DON'T think they are.....They are just pointing out the same thing I said which is how best to teach a n00b the easiest way.... Remember my vids are not for a pro but a new person building this heli.... Thats why I do them!

You are RIGHT to ask questions and debate how I do things. In fact THANK YOU for asking as this allows people to LEARN and also understand other ways!

PLEASE I like that you asked this question as I think it makes people THINK man! THUMBS UP to you! :thumbup:

Bob

[th3tick]

In another portion of HF, there was a discussion about subtrim. One person asserted that you should never, ever use subtrim. You should accomplish the perfect neutral position through other means such as arm selection.

This leads me to two questions:

1) Why is subtrim evil? Does it create uneven throws of the servo?
2) Is this reasonably possible in any, let alone all, setups?

I've not yet found a way to do it with any of mine. Heck, in a lot of cases, it's not even what I'd call "as close as I'd like".

John

[psindrup]

PLEASE I like that you asked this question as I think it makes people THINK man! THUMBS UP to you! :thumbup:Bob

Thanks - I will keep asking questions, then :smokin:

Peter

PS: I am no pro - I am a newbie too, but I like to understand what I am doing, and why. :DOH

[Finless]

PS: I am no pro - I am a newbie too, but I like to understand what I am doing, and why. :DOH

Thats OK..... I LOVE questions and debating the best way.... Please ALWAYS feel welcome to ask man!

Bob

[hookmaker]

John, I am in no way an expert on this, but I asked the same questions at some point.

I think the term "sub trim evil" is rubbish - no such thing. Use sub-trim all you want, but once you use it "excessively" (and just how much is that??) it WILL affect your system in a degree that it will affect your flying.

In a "pure" 90 degree swash system it doesn´t matter much (unless you go to extremes), but in a 120 system where the swash is worked by three servoes that are interlinked it matters a lot. Because to work together the most, they HAVE to be set up the same. The more they are not, the less "pure" the system becomes and this will be felt in the controls quite early (with only little impurities).

Trims and subtrims are "offsets" from center and they WILL affect the travel range and/or speed of the servoarm - no matter how little you put in. So if you i.e. have two servos that are not trimmed and one that is, you automatically have a system that is not consisting of equal movement and this WILL affect your flying in some degree.

Please correct me if I am wrong.

/Henrik

[th3tick]

OK, that makes sense. I guess the only true way to fix it would be to stick to Hitec digital servos and get their programmer. That's an expensive route to go, however...

It's interesting that in the age of digital transmitters and servos that we still use an analog signal for control of the servos. Of course, if we didn't, I'm sure each vendor would come up with their own protocol, turning it into a brand-locked mess...

Thanks!
John

[Finless]

kookmaker there is a MYTH and I am going to bust it right now!

Most radios today that are SMART will skew when you use subtrim and center within those new points.
However this is NOT true when you use stick trim!
This entire "don't use subtrim" thing is a FREAKIN myth.... TRUST ME!
I personally have measured servo throw and ATV (or EPA) when using subtrim up to 100 steps and it does NOT effect ATV (or EPA's) at all. There is nothing wrong with using subtrim to 90 your servos even on a CCPM system! Anyone thats says that is not true is OLD SCHOOL as this is how older radios worked!!!! Newer radios DON'T work that way even when swash is set to CCPM 120 or 140!

So you know I have had PRO's tell me that my videos telling people to use subtrim on a CCPM heli was not right! THEN I showed them USING THEIR radio that no matter how much you dialed in subtrim, it still did not effect the ends of throw. They stammered then HAWed and said "well if you put your ATVs at 150 for max resolution then it does"..... WHO DOES THAT? Even they didn't do that! WTF?

Anyway I cant speak for all radios but for sure I know that sub-trimming on the following radios DOES NOT effect ATV or cause interactions.
Futaba 9C
Futaba 7C
JR 9303 or the new X9303
DX7
Futaba 14mz
Futaba 9Z

So anyone telling someone to NOT use subtrims on the above radios is FULL OF IT... Sorry that is the facts jack.... If someone tells you that crap,,,,,, it is MYTH and ask them to prove it to you! A protractor and calipers will revealed the TRUTH.
When they loose the bet please send me 1% of the winnings ;)

Bob

[booger]

Thanks for clearing that myth up Bob I have heard that same myth around my club and still going strong today.
and they arre using all the radio's above you mentioned.
+1 for the new guy

[Finless]

Ya know what booger (love than handle BTW reminds me of the revenge of the nerds movie) but all this talk about not using subtrim really cranks my chain ;)

People that like to SPOUT fact that comes from Joe Schmo which was said by Jack, which "says" this came from Curtis or some Pro...... Really should do some REAL fact finding on their own before that start telling everyone else what the facts are! So you know that HE SAID SHE SAID crap is what gets my goat! Every weekend I spend time SHOWING people the truth about things like this. I enjoy doing it and in the long run I hope it spreads......

Bob

[hopntod]

Good information for us rookies Bob.Now if I can just get past the stigma of using karbonite instead of metal gears,I might be able to quit therapy completely.
Todd

[spencer737]

Hey Bob, can u tell us what tools are needed for the build. You know like what size allen wrenches?? Thanks Alot!!!!!!!! :)

[nintendofanboy]

thanks for the vid's bob cant wait till i can get my hands on one

[th3tick]

So, will an AR9000/JR R921 fit between the frames? Will it work on the little shelf with clearance for the side wiring to the satellites?

John

EDIT: Sorry, don't have mine yet, and got an irrational fear...

[Finless]

Yes of course it will fit! Sheesh it fits between a 450 frame......

However in my vids it's going on top of the tail box because the servo wires are too short to reach to the bottom or even the tray...

Bob

[psindrup]

However in my vids it's going on top of the tail box because the servo wires are too short to reach to the bottom or even the tray...
Bob

I noticed how short the servo wires were in your servo video, and thought hmnn ... that is going to be interesting how Bob is going to fix that. :wink:

Is there anyone out there that happens to know if the wires a just as short on the other servo alternatives?

T.i.a.

Peter

[bullaculla]

Hey Bob, All those arms DO come with the 5245 servos including the trick aluminum one, thats why I posted it ;) Also, the wires are at least 7 inches long. I dont remember if I trimmed mine or not.
:)

:edit:
RH website states the wire is 12 inches :thumbup:

[carlos]

nice work with the videos Bob.
Keep em comin.

[ties]

What do you think about these servos? anyone using them? experience?

JR Z3650

Type: Digital
Torque:42 oz/in @ 4.8V, 51 oz/in @ 6V
Speed:.11 sec/60° @ 4.8V, .09 sec/60° @ 6V
Dimensions (WxLxH):.58" x 1.30" x 1.02"
Weight:1.04 oz.
Bearing:Single ball bearing
Motor Type:Coreless Motor
Gears:Metal Gears

Strong enough? Fast enough?

[hookmaker]

Bob! Thanks for clearing up yet another matter, - I basically agreed with you about "that trim BS", but you took it even further and took away the myth of sub-trim as I have been taught. I did actually believe that there would be a shift in ATV and servo center, but I am glad to hear that my 14MZ and many other transmitters don't even care.

Thanks for the lesson. Respect......again!

/Henrik

[Hangarace]

In reference to..5245 servos and arms including the trick aluminum one Cool! FYI...The metal one is the only one that supports 16.5mm. I belive that is the measurement that Bob talks about in his video.
Dave:thumbs-up2:

[jack726]

Hay Bob
Sorry I meant to send it in a PM

Jack

[bugdozer]

In reference to..5245 servos and arms including the trick aluminum one Cool! FYI...The metal one is the only one that supports 16.5mm. I belive that is the measurement that Bob talks about in his video.
Dave:thumbs-up2:

Have one in my hand right now. 16mm center-to-center third hole out. Sweet!