Discussion The ExceedRC/EXI 450 Class Owners Thread (Blueray, Genesis ,Vertex,Legend,SEF,etc)

[rocketscience]

Originally Posted by frac

once again, they are not MG. one gear is plastic.


frac

ahh that's right. Forgot about that. Still.. digital. $9. Might be worth a try.

Just flew at lunch w/ hk450. has the 2215 motor with 12T. I used some 20c batts and 30C batts.. it feels 'weak'. Maybe the temperature, maybe my batteries are getting old. not sure. I may have to go up to 13T.

[Melnic]

I have the EXI D213's in my EXI 250.
If a gear breaks, I got the $1 gear set (which is all plastic) they have on hobbypartz website. Those gearsets did NOT fit the stock blueray servos.
I'm hoping the one gear that is plastic on the D213 is in that set.

[frac]

Originally Posted by rocketscience

ahh that's right. Forgot about that. Still.. digital. $9. Might be worth a try.

http://www.unitedhobbies.com/hobbyci...12.5g_/_.11sec

not sure if that's the same as the r2hobbies one, read reviews on HC,
the r2 price may be cheaper

and something we should investigate if it will fit:
http://www.unitedhobbies.com/hobbyci...g/.08sec/18.8g

fast

Just flew at lunch w/ hk450. has the 2215 motor with 12T. I used some 20c batts and 30C batts.. it feels 'weak'. Maybe the temperature, maybe my batteries are getting old. not sure. I may have to go up to 13T.

use logger to see what's going on and charger sw to track charge cycle

after doing repairs on BR-typhoon, i flew it and it was so perfect.

then i brought it in to put the logger on, and when i flew the tail was suddenly inexplicably crap. extremely frustrating.

put another exi black gear on to see how it goes, the align that was on it was chipped.

it seemed pretty strong, but not like the 3700....but it's obviously more efficient.

what can i use for a good easily made constant current load to calibrate my logger, i don't trust the current readings i'm getting....V seems OK.



frac

[frac]

Originally Posted by Melnic

I have the EXI D213's in my EXI 250.
If a gear breaks, I got the $1 gear set (which is all plastic) they have on hobbypartz website. Those gearsets did NOT fit the stock blueray servos.
I'm hoping the one gear that is plastic on the D213 is in that set.

isn't that annoying? xheli/hobbyp could just have easily had that one available for it and users would love them for doing that.

i wonder if any of these gears are standards available from some mechanical supply or if the servo guys custom make them


frac

[Melnic]

I wonder if you can put your logger on the battery while charging?
Current value would be backwards though cause it's charging and not discharging.

Lets see V=IR
R=V/I
12V/10A = 1.2 ohms
10A * 12V = 120 Watts
1 ohm 200 watt resistor? That's a big suka.

Frac, If you hover an Alpha 400 w/ say an 11T or 12T pinion, that should be close to I recall 12A

[frac]

Originally Posted by Melnic

I wonder if you can put your logger on the battery while charging?
Current value would be backwards though cause it's charging and not discharging.

this might work.

Frac, If you hover an Alpha 400 w/ say an 11T or 12T pinion, that should be close to I recall 12A

no alphas mounted at moment. but i have a BIG difference with rocket's
and others posted logs for the 3700 and 2215

the servo current monitor has a resolution of .01 A. pretty good.

did you see above? .6A for the entire Rx.... i am suspicious



frac

[rocketscience]

Ferrite ring is for BEC, right? Not throttle on ESC? So if you disconnect the red wire on a Plush ESC then you can remove the ferrite ring?

[Melnic]

Yea rocket, that should be fine.

Vid from today at lunch

EXI 450 short Inverted Flight (5 min 9 sec)

[frac]

rocket ,why are you no longer using the internal bec on the plush ?



frac

[rocketscience]

Originally Posted by frac

rocket ,why are you no longer using the internal bec on the plush ?



frac

It's actually for the 500. Replacing the volcano 80A w/ 80A plush.

And the separate bec already has a ferrite ring.

[flapdown]

duplicate, sorry

[flapdown]

Hi frac;

I could not locate your threads on
the Direct Drive Variable Pitch Tail with that
blue wonder 1500KV motor

Help me please.

Thanks.

[frac]

Originally Posted by flapdown

Hi frac;

I could not locate your threads on
the Direct Drive Variable Pitch Tail with that
blue wonder 1500KV motor

Help me please.

Thanks.

hey flap. here's the thread:

http://www.rcgroups.com/forums/showthread.php?t=1035211

there is also some other stuff on it above in this thread.

i am still developing this and was intending on doing a full write up in the near future.

i mention some other older threads about it in the thread above.

i've decided that using the 1500kv(vs the 1700) motor is best as it has a higher current and V rating.

the most important thing to get it to work right is to minimize vibration by balancing the blades and rotor assembly, and use a strong material for the shaft so that it is straight. this because you will be running the tail at full speed (13K-15K rpm) almost all the time.

i'm waiting now on what's called "EROD", a super hard metal rod
stock used in plastics manufacture for extrusion ejectors. some people used it for main shafts on their helis, it is inexpensive and available at:

http://www.plastixs.com/ep07.html

like drill rod you will have to take it down a few thousandths to get it to fit through 3mm bearings, you can use 200 grit sandpaper with the rod chucked in a drill and finish with wet sanding with 600 grit sandpaper, according to murdnunoc.

you are supposed to be able to do this with a 10A esc but i was burning the cheap ones i use out when i hit the tail blades on the ground so i went to a 20A and have not destroyed one since. i use the hobbycity HK/SS 18-20A:

http://www.unitedhobbies.com/hobbyci...&ParentCat=182

the 15A will probably work too. they are cheap. any similar will do

the hobbycity HK450 metal upgrade tail is the cheapest and best to use
for the basic assembly, the blue wonder fits right in after the flanged bearings are removed:

http://www.unitedhobbies.com/hobbyci...Upgrade_(HK450)

using this tail assembly you do not have to use the extension on the slider that i described in the thread above.

the motor comes with a mount which you modify by cutting off the "fins" on it with a hacksaw. you then use it and it's set screws as a spacer between the plates of the tail instead of the small spacers that
come with the tail. this is the only way to stop the motor from rotating,which will wreck the wires, or popping out of the tail assembly.

be careful with the motor wires, they are easy to break.

take care not to run the speed too high or you will be throwing tail grips
especially if you hit the tail blades on the ground, and use good screws
to hold the tail blade rotor grips on the hub.

i am controlling this tail with it's own channel on an 8ch rx into which is mixed the throttle, but you can experiment with running it at constant speed, which is supposed to be best.ppl have used ESC with governors for this also, wherein you don't need an extra channel.

it takes about 1/2 hour to make the tail once you have all the parts, and assuming you use the tail rotor you already have the cost is about $20-$25.

let me know how it goes if you decide to do this. searching on
"DD tail for 450" here might produce other threads, the original discussions on this happened sometime in 2006 or so.


frac

[mrmitch31]

Originally Posted by Melnic

Yea rocket, that should be fine.

Vid from today at lunch

Excellent flying, nice control. You'd better be careful spending so much time upside down, you'll forget how to fly right side up.

[Melnic]

Inverted is just inherently more risky. It at least is for me.I think all my crashes this year was from inverted or something close. With winter comming, I just can't find myself to have "happy fingers" in the cold. I'll be doing simple flying from here on out till spring.
I mostly fly planks in the winter anyway. I'm finishing up a CAP 232 arf tonight I hope.

FRAC, using the GY400 on that DDVP ?