RE: Showtime
 

A servo is a servo without any load.

If I took 2 battery packs 1800mah and hooked them up to identical dimmer switch's and light bulb's and then set the intensity of the light so that they were the same brightness, are you telling me that a 1(1.2v) cell battery would outlast a 24(28.8v)cell battery?

RE: Showtime
 

OK, using your analogy then for the servos to be the same you would have to move your radio stick slower to make sure they drew the same amount of current as the 4.8 volt pack.


The servos Will draw more current with the 6 volt pack

RE: Showtime
 

Do you have a dimmer switch on your servos too?

You know what? You are right. You must be. At least it is not that important to me. I thought I was trying to help but evidently a masters degree in electronics engineering didn't teach me much.

RE: Showtime
 

I don't want to come across as if I know more than you, as I do not. I am trying to understand this though, and have something to learn.

I agree at rest that the 6 volt will draw more(no dimmer switch) but as soon as you put them to practical work---?

I think my dimmer switch on my servos works like this:

My guess is that it is the holding power that significantly draws energy?. For the servo to hold a surface needing 10oz of torque the servo draws more amps than at rest? And at 90oz of torque it draws a lot more watts than at 10oz of torque? Am I wrong here?

I also think that in order for a servo to hold at 80oz of load it is the watts that are supplying the power to do this? So that would mean that the 4.8 volt battery would draw more amps to get the work done than the 6 volt battery. Is this not the way work gets done?

Is this not the way servos work? What am I missing?

RE: Showtime
 

On the subject of the 'right' engine for the Showtime - I may have missed a post, but has anybody considered a Magnum 120 FS? I like the Saitos, but the Magnum 120 should provide more weight in the front and eliminate added lead.
The 120 should have enough power; I'm a bit hesitant using a Saito 100 after reading a few posts.
Any overall comment on the Magnum 120 four strokes?
Thanks....

RE: Showtime
 

My guess is that it is the load on the servo(how many oz of torque needed to keep the surface where you want it) more than how fast you move the stick that really draws the energy. And if you are flying the same style on the same plane putting the same load on the servos it is easy to do. I don't think I use the full speed of my servos very often during a flight?

Am I missing something here?

RE: Showtime
 

I have seen people very happy with the plane from a YS110 to a Moki 1.8. The Mag 120 is in the middle there and should be good.

RE: Showtime
 

I walked out to the trailer a few minutes ago to pull the 1.20 out of my laser & just couldn't do it. [:o] That is just one of my all time favorite planes. So I guess mine is going to get a 1.00 after all. If it turns out not being enough, then maybe I'll rethink it but I know this thing can't weigh any more then my Goldberg Ultimate and the 100 flew it just fine. Now all I have to do is figure out how I am gonna live without my Ultimate!

STG, I wish I had the patience to explain it to you but I don't. Sorry. This string is about the Showtime, not basic electronic theory so I think its time it got back to the plane.

RE: Showtime
 

It is the speed and the torque they are both relative, You will not be putting the same load on the servos, even if you do the exact same manuver with the exact same stick movement.
Servos have a 4.8 volt and a 6 volt rating, the 6 volt rating is higher and faster, where do you think the extra speed and torque can come from? Its not free, it comes from increased current draw. :)
I really don't know how to explain it better so maybe someone else can.



My showtime is getting a Satio 100 also. :)

The

RE: Showtime
 

I agree it is about the Showtime.

No it is not free, but how much does it cost if you don't use it?

Please answer this one simple question just yes or no and I will not say any more.

I have a servo that needs to hold for 30 seconds at 70oz of torque. One is on a 4.8volt battery and one is on a 6.0 volt battery. There is an amp meter in line, will it draw more amps with the 6.0v(5 cell) volt battery at 70oz than with the 4.8v battery?

Thanks.


-------------

I have started a post in the correct location.

http://www.rcuniverse.com/forum/m_32...tm.htm#3225490

RE: Showtime
 

That is the thing, you are not going to be holding it at the same torque and you can't make it do that. You can't control if you are using it or not. I would think that would be relative to airplane weight, speed, temp outside, humidity, AOA of the plane during the maneuver, anti-gravity generator who knows what else. :)

I would guess if you set it up like you are saying they would be the same but Im not an EE so I don't know the theory on it.

RE: Showtime
 

I could on the bench. That is how I would test it.

If they are the same the 6.0v should last just as long.

Can you see what I am getting at here? Same plane take the 4.8 pack fly it around as I like to fly, put a 6.0v pack in fly in a very similar manner. Is the 4.8 really going to last longer when I have another full cell of potential up there with the 6.0v battery?

RE: Showtime
 

Its on the plane that counts which I think has been explained a few times.
Yes the 4.8 will last longer. Do a search or maybe post a question in the Batteries forum.

http://www.rcuniverse.com/forum/tt.asp?forumid=84

RE: Showtime
 

You BATTERY Guys need to try/start another thread....Sorry!

RE: Showtime
 

lol

on the servo question (I promise this one is related to this thread :D). What size servo do you put on your rudder? I just got my showtime and the manual said that they put a 155 Oz servo on it? If I can get away with the new JR Sport 125 MG, I'd like to (125 Oz at 4.8), because at 35 dollars, it's significantly cheaper than other options.

Thanks for the input
Josh

RE: Showtime
 

Sorry for what. You are about an hour late on that one. Post #560




Yes that is plenty an a 10 pound plane. Don't set your throws for more than 50°

Just think, Horizon was saying 60oz standard gear train servos were OK on the F90. [sm=lol.gif]

RE: Showtime
 

60 oz on the funtana... that's laughable :)... it's like flutter waiting to happen.

RE: Showtime
 

:)I must have missed the 155 oz rating in the manual. I thought I saw something about 125 but I don't recall 155. Probably there but I don't remember reading it. But I used the Hitec HS5645 which has 143ozs on 4.8v (I'm gonna pretend that is the best voltage) and I haven't had any flutter and I don't think I will. I've made some fairly fast fly bys and everything seems ok. So I think your servo selection will be fine.
thanks
Barry

RE: Showtime
 

what is the amp draw on 6 servos under full load?

RE: Showtime
 

42.77 jiggawatts

RE: Showtime
 

in that case youll need a flux capacitor

RE: Showtime
 

I put a 5645 on my rudder as well. For that matter, I put a 5645 on the rudder of my Hanger 9 Extra 260 and it has proven to be everything the plane needs, enough in fact that the rudder has cracked from straining against the servo. Then too, I pretend that 6v is the perfect battery. :D

RE: Showtime
 

what you're missing is that at 6v the servo is drawing more amps from the battery than the 4v.

if the 4.8v battery has a servo with a load of 80.oz it will draw less amps than a 6v, if the servo falls under the 80 oz. at 4.8v rating, it will draw what it's rated for and the same goes for the 6v.As long as you don't add more torque to the servo than what it is rated for it will not draw more amps than its' rating

Watts is just a measure of energy used

RE: Showtime
 

well ill clear up my end of it.. I run 6 HS645s in my showtime and a friend has HS-5625s and all of my other planes are running Li-Pos.. and i wouldnt hesitate flying 2 days in a row on a charge.. Li-Pos and Li-Ion battery can take a higher load and produce the same power WAY longer than ANY nicad and Li-ion battery pack at a 1/4 of the weight.. That is why your laptop battery is Li-ion and your cellular has them because they are practical for the purpose. soon the nicad and the nimh battery will have a home next to the dry cell in the musem.

..Its your choice. use what you want. learn how your battery behaves and charge accordingly, SIMPLE

RE: Showtime
 

Well if it is on the SHowtime....


http://www.rcgroups.com/links/index....t=articleprint

"At this fully loaded position(77oz), the servo(6635) drew 1530 mA at 6.0 V"

So, 6 x 1530 at 6 vots = 9.18 amps

I think a standard connector used to plug into receivers is good for only 3amps so as you can see, this is not easily obtained on a 10 pound plane.

Please also see:

http://www.rcuniverse.com/forum/m_3225490/tm.htm