Gandalfg77

Hey all,

I am sure this is an easy one, but I have not been able to find any info about it. I am looking to run the Himax HB2815-2000(25amp max) with a 30amp Jeti Advanced ESC, with an ALIGN Li-Polymer Battery 11.1V 2100mAh/16C(as per link below). My question is, the battery has a constant discharge of 33.6amps, where the esc is only 30amp. I know the ESC will regulate the amps for the Motor(25amp max) but what about the ESC recieving too many Amps. Do I need a bigger ESC??

http://shop.eflypower.com/product_in...roducts_id=707


Regards

Paul.[&:]

burnt_sandwich

Gandalf,
Do not quote me on this, but I believe the way a motor works is that it draws as many amps as it needs (ie 25 at WOT), and that is all that is taken from the battery. I think that resistance varies inversely with throttle and load, so that at half throttle the motor has a greater resistance so less current is drawn from the battery. Therefore your 30A ESC will be enough, but you may wish to use a bigger one because sometimes the current will spike over 30A depending on what prop you are using. The rated maximum is only what the motor can run at continuously, not what it will actually draw under all conditions.

burnt_sandwich

A question for those with alumium motor mounts, what gauge/thickness metal did you use?

flyingace451

I'd go with a slightly larger ESC just to be on the safe side.

Weather looks good, I just might be able to fly my Stryker today! After 3 weeks of sitting here doing nothing....

zeroseven

I got my problem fixed just to update you guys it was the rx. I didn't want to bother with shipping it back to PZ so i just bought a new one and everything works right now. Ready to get this thing in the air for the first time. [8D]

Glacier Girl

My Feedback: (4)

zeroseven,
Call PZ, explain the problem, ask for a call tag,(free shipping for you), they will replace it.
Keep it as a spare.

Gandalfg77

flyingace451, Burnt_sandwich

Thanks for the replys.

I was thinking about going for a bigger ESC, has anyone used these ones, if so which would you recommend?? For the Himax 2815-2000

Align 35amp
http://shop.eflypower.com/product_in...bb1ad08a61e8f7

JB 40-Amp
http://shop.eflypower.com/product_in...bb1ad08a61e8f7

Or should I save my pennies and get the CC35
http://shop.eflypower.com/product_in...bb1ad08a61e8f7

Regards
Paul.

Glacier Girl

My Feedback: (4)

Hey all,
Thought I'd show you what I've been up to.
I just finished Ray/cadetman's latest venture, the humongous F16 kit.
65" long, AOW of 39 oz. And you know me, it's got a Mega under the hood.

flyingace451

Wow I wish I had a whole garage to work in. I'm stuck to a closet, which is mainly storage.

When are you going to maiden it? Video? Video? Video??? lol

Woohoo! We're starting to send in summer job applications!

Glacier Girl

My Feedback: (4)

Well it won't be today.
Dang weatherman, they forcast cold and light winds, as of 7:00 am we have 3+ inches of snow and it's not slowing down.[:@]

How bout a comparison shot of the Stryker to F16 so you can see the size difference, man you could launch a Stryker from it.

gleebs

Gandalf,

If you are saving money to go with the CC35, I would say go with the CC45. I bought the CC35 and now wish I had the 45 because I want to run more cells and more amps. The CC45 is only .1 ounces heavier, and my depending on where you get it only $10 more. Then you will have much more upgrade-ability. You will have all the programming features you need, and with castle link you can upgrade the software in your speed control.

critterhunter

GG, plane looks great but I'm more envious of that view you have from your house. Do you have a nice block of woods around you and do you hunt? I always wanted to have a house in the woods where I care shoot a deer off my patio.

flyingace451

Hey at least you have snow and only light wind. We have rain in 40 degree weather with 15-20 mph winds.

My Stryker has been grounded for too long! Of course, I would have been able to fly it 4 days ago in the morning cause it was calm and sunny. But my dad wasn't awake so he couldnt' take me. Ah...I only have to wait a little longer until drivers license.

drunken pilot

hi there ive been working on my stryker for half a year and now that i thought i had found the perfect setup, im stuck with a cutoff problem...

*** dual sky 3s 2p 1050 mAh (each pack) 11.1v 10-12C (16 burst), 6x4 and 6x5.5 prop, mega 16-15-4 and a brand new CC35

***anyone correct me if i'm wrong about these stats

on the 6x4 im pulling around 21.5 amps and on a 6x5.5 around 26.5 amps (at full throttle)
if i consider the 12C of my paralelled packs,togheter they can deliver around 25.2 and 33.6 if i consider the 16C burst. could u explain why, on my 6x4, i can go WOT for only 5 seconds and on my 6x5.5 only for a quarter of second?

could both of my batts be already dead?

also: when i had my 25 amp OTTER esc (not a typing mistake that meant OTHER), i had that very anoying throttle shaking problem (see part 3 near the 80s) but absolutely no cutoff. now that i have my CC35, i can never go more than 75% throttle. could the current limitting from the esc be responsible for these abusive cutoffs? or would it be a pure coincidence that both batteries died at that very precise moment ( when i changed my esc). im seriously considering getting a 15-20C 2100 mAh or more 3s pack but... thats means some more$$$[:-].

thx anyone who can help my desperate cause

Mayday!Mayday!

DP, there could be a number of things to factor in such as bad solder joints, lipos going downhill, lipos cold when you test so on and so on. But a good rule of thumb is only use 80% of the battery. The battery puts out 25 amp and you are pulling 21, I would say the batteries are not up to the task.
One of the setups I have pulls 27 amps but the batteries I use in it are rated at 42 and 63 amps, more than enough.

Heres a test for this aside from a watt meter, put a 5x4 or a 4.75x4.75 prop on the setup exactly like you have it and see what happens.

Either the esc is programmed for the wrong cutoff or the batteries are dropping voltage too low at wot.
Try one of the smaller props and see what happens. If they work without cutting off, I would say get a higher rated battery.

Hope this helped, I'm sure someone else may have some input too. BG

guitarrarl

hi friends: I am using on my large Blue Core plane two 2000 mah in parallel to obtain 4000 mah. Is is possible and safe to charge both at the same time in parallell at 1.5 amps ?


Thanks, Raymond

drunken pilot

bgcatfish, i am about to test it ur way as soon as i get a driver to bring me to LHS. but the fact that on my older esc the problem wasnt occuring at all seems weird to me.. same batts and i could go WOT non stop for like 5-6 minutes on a 6x4... and it's now that ive bought this expensive CC35 that they would not be strong enough? well i think im gonna change the cutoff settings first, hoping i wont fry anything

*** a whole new question : what is the difference between ''prop static trust'' and ''prop in flight trust'' . isnt it supposed to be the same?

and guitarrarl... NO!!![X(] correct me again if i'm wrong but u shall never charge 2 batts on the same charger... ok maybe if u buy a 6s balancer (im still not sure). but anyway connections will be impossible with ur paraleled packs if u only have a 3s balancer. and if u get to do it ( i dont know how), the point is that ur batts will never get discharged to the same point (in flight). so when ur gonna charge them, or the charger recognizes the first pack thats if fully charged and stops charging both (safer way but performance decrease), or he recognizes only when the 2nd is finished ( overcharging risk for the first pack= fire= do some research and look at the very nice pictures of lipo fires)

if u guys find a way to do it, let me know... im using paralelled packs too!

KiwiKid

Too hot to fly.......must......find......water...

flyingace451

You complaining about hot??? I flew today in 31 degrees.[&:] Nearly froze my fingers off

zeroseven

Ok i have another problem. [>:] I think my motor is fried when i give it throttle it sounds terrible and i can see it sparking inside the motor casing. I still havent flown this thing once! I am a little bummed out with this thing honestly.

Glacier Girl

My Feedback: (4)

DP,
Ditto on the packs, it sounds like they are not strong enough, and are dropping off.
Also look at the current limiting on the esc, no not the cut off, the current limiting, try switching it from normal to disabled.
Alos static is different from inflight draw. Static is usually higher, but in some odd cases can be lower then in flight.
guitarral,
No do not try charging at same time. For the exact reason DP mentioned.

Kiwi,
Bragger It was a balmy 4 here today with the wind chill below zero.

zeroseven,
# 1 don't run it too long static, not good for it's health. #2 sparking is normal, especially on a new motor until it seats the brushes, that's why we recommend the water break in.
#3 what kinda noise. If it's a grinding, check to see if the prop is hitting the motor mount screws. If not let us know what kind of noise you hear.

zeroseven

Alright, i just looked at it and i does look like the prop is hitting the motor mount screws. What can i do about this?

Thanks for helping me out btw i really appreciate it.

Mayday!Mayday!

Zero, one thing you can do is take the tip of a toothpick(just a very small part of the tip about this long _ ) and push it in the prop and then one single drop of CA in there and put the prop back on leave about 1/8 inch from the motor. This will hold the prop from going to far forward and even with the CA in it you could still pop the prop back off when needed. BG

Mayday!Mayday!

Also, glad to see you got a good set of stock electrioncs now. Get the prop done (all of 2 minutes to do) and you can get it in the air.

guitarrarl

Hi All

The photo looks like us today.. we had six people flying Strykers at the same time today. I flew my BIG BLUE about ten times today and we had two colisions in mid air, one plane on fire on landing (the ESC burned wen the motor got stoped on a bad landing). Another plane hit the ground nose straight into the ground, quite bad for a balsa plane. None of these were Strykers. I will post some photos tomorrow.

Raymond