RunRyder RC Helicopter Topic - Are you ready for this? 464gram T-Rex w/ 20 min fly times on a 1200mAH

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e-Align T-REX 250-450-500-600 > Are you ready for this? 464gram T-Rex w/ 20 min fly times on a 1200mAH

rotaryguy
Senior Heliman
Location: Jacksonville, Florida

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gyro

thanks dell,
I ordered the CSM SL420 and should have it on my t-rex to test fly Wednesday night.

02-15-2005 10:04 PM

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dnam
Veteran
Location: Herndon, VA - USA

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Quote
Are either of you actually using one of these csm gyros on a trex????

Yes, I use the micro CSM SL560 on my T-rex and this is the best gyro I have tried as of yet (had Fut 401 and JR G500T) - tail is rock steady. I really like the easy adjustability as well. Don't forget to read the good manual to set it up properly. Some people leave this part out and then complain.

02-15-2005 10:45 PM

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dnam
Veteran
Location: Herndon, VA - USA

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DIY motor tips

For those of you who are DIY-ing their motor this might be interesting. I have not made one myself but a lot of info and some nice diagrams:

http://www.aircraft-world.com/prod_...c-diykit-vl.htm
http://www.aircraft-world.com/prod_...diymot-2207.htm

Tips:
http://www.rcgroups.com/forums/showthread.php?p=2274045

02-16-2005 12:19 AM

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rcmarty
Veteran
Location: Penticton , B.C. CANADA

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Jarrod..

How does the axi motor work ? I was thinking if it's a good match then it would bolt up and take a stock pinion without a problem.

Now that some have had the cdrom motor for a bit how does it work for everyone ? I'd like some opinions. I have all the parts less the magnets to do the motor up. Currently sidetracked with a dragonfly setup.

I'm looking for basic hovering and some forward flight. No 3d yet.

Thanks , martin

02-18-2005 12:46 AM

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averen
Veteran
Location: Austin, TX

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I've created some "tools" for working on and with the T-Rex. Hopefully some of these will come in handy for some of you

Pitch Gauge - just cut it out of card stock...cheap, easy and pretty accurate. Pitches are in absolute values, so if something looks off, flip the template around

http://www.averen.us/temp/T-Rex-PitchGauge.pdf

Anti Rotation Plate - This one hasn't been tested yet. It's being machined by a friend as I type. Hopefully I'll have more info about the correctness of this by tomorrow, so for now use at your own risk!
http://www.averen.us/temp/T-RexAntiRotationPlate.pdf

120* eCCPM Template - This one works very well! Just use a piece of 1/4" x 1/64" brass or aluminum or whatever. Cutout the template and glue it to the metal with some glue stick or 3M77, whatever flavor you like. Drill the holes on the crosses and mount with M2 screws that came with the kit. Works like a charm! This one took me a while to get finished...but it's extremely accurate!
http://www.averen.us/temp/T-Rex_120eCCPM.pdf

Hope this makes your lives easier

Here's a pic of my T-Rex with the 120* eCCPM band on it. I still need to move the canopy mounts out of the way...

Jared

02-19-2005 06:10 PM

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dnam
Veteran
Location: Herndon, VA - USA

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Avaren,

You might want to post this in the Tip and cheap fixes thread so everything is in one place.
http://www.runryder.com/helicopter/t153335p2/

02-19-2005 08:06 PM

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averen
Veteran
Location: Austin, TX

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Hey All,
Well, the T-Rex is flying really well with the DIY Brushless in there. I'm not getting very long flights though, seems I'm drawing a lot of amps somewhere. Enough to shutdown the CC10 ESC after a while or on warm days!

So I decided to build another motor. I have ordered the parts and received them today. I picked up all GB parts except for the magnets which I received from strongrcmotors.com. I ordered the curved magnets and didn't realize that they were only 1mm thick until today when I received them

This means that my airgap will be about 1.5mm or so. Which is pretty large! Should I even bother using these? Or should I just order some 2mm magnets? These are the N50s so I guess they're a little stronger than the N45s that GB sells.

Also, what pinion is everyone using on their double stack? Currently I have a 26T on there which is good for 2700RPM. I'll probably go down to a 22T later this week, just haven't gotten around to it yet. Currently with a 2100 3S pack I get about 15 minutes of flight time...

Thanks!
Jared

03-04-2005 12:04 AM

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rotaryguy
Senior Heliman
Location: Jacksonville, Florida

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You are probably pulling the amps because of such a large pinion, unless your doing hard 3d you should be able to do basic aero on 2100-2200 rpm with the 305's assuming you have shaved off all the weight. Mine weighs just under 500 grams with an etec 1250 and the stock canopy and it flies well at 2100rpm, not a rocket by any stretch but it does OK in my opinion.

Also, you are probably using a 48 pitch pinion which will also rob power because of the incorrect pitch, noisy too.

03-04-2005 02:40 AM

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averen
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Location: Austin, TX

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I thought the T-Rex main gear used a 48 pitch gear? What does it use and where do I find different pinions for it?

I have shaved off as much weight as I can without doing the eCCPM thing. I have been waiting for the plate which a friend is making for almost 3 weeks now! Hopefully soon...hopefully.

I checked my head speed while I was flying today...it was 2100 at full throttle and collective. Not as great as I thought.

I'm not doing hard 3D, I'm just want to get some more time so I can work on my hovering...then maybe in a year some 3D

What pinion are you using? And what are the specs of your motor? Number of Magnets, stators, winds? Kv?

Thanks!
Jared

03-04-2005 02:59 AM

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rotaryguy
Senior Heliman
Location: Jacksonville, Florida

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the trex uses .5 modulus gears. they can be purchased several places. modefos, rchover, grandrc, heli hobby and many more I am sure.
The big problem is that you will have problems finding one bigger than 15 tooth, second problem is they are usually all 2, 2.3, or 3.17 shaft.

I have learned that an Eco 8 uses .5 mod pinions and they go up to 17 tooth in a 3.17 shaft otherwise the stock align pinions go up to 15 tooth.
Second, you can get a pinion reducer from rchover or sparrow that will reduce a 3.2 pinion down to either a 2.3 or 2.0mm.
You can get a perfect reduced shaft from aircraft world thats 3mm shaft with a 2mm pinion end.

If you can afford to buy one, get a medusa power analyzer or something similar, they are fantastic. I cant say how helpful it has been in tuning the trex or anything for that matter.

hope this helps some.

03-04-2005 03:23 AM

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rotaryguy
Senior Heliman
Location: Jacksonville, Florida

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sorry for the double post..
I forgot, You say you havent done the ccpm mod than you are flying a lot of extra weight around, I feel the key is shaving off the weight.

I have tried several motors too date and I am curently testing a double, full 10mm wound 7 turns 12 magnets with a double strand of 26ga and terminated WYE. On a 15 tooth pinion it runs about 2100 rpm at zero pitch pulling less than 4 amps and at -12 degrees static it pulls about 11 amps. Of course it should unload slightly in the air at full collective.

I plan on trying another wye wind thats wound parallel. I will post results.
Terry

03-04-2005 03:32 AM

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averen
Veteran
Location: Austin, TX

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I think I'm just going to order one of battlecon's frame upgrades. Hopefully that will shave off some weight from the frame as well as giving me eCCPM. Otherwise I'll probably wait months for this simple part!

Thanks again for all the help! Let me know how that motor works out. I may go that route as well.

Jared

03-04-2005 03:45 AM

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rcmarty
Veteran
Location: Penticton , B.C. CANADA

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rotoryguy...

Hvae you done the reccomended 12T double , delta motor ? How did you like it ? I need to order up some magents to finish mine off. I've been holding back for a bit as i'm busy these days with work and changing jobs but would like to get the rex going again.

Is the extra 7 stack worth the effort ?
I have the gb double kit and need to order the 4x10x2 mags for it. Is 4x10x2 the proper size for the gb doubles ? I've had conflicting reports.

Does anyone know the size of the hole in the gb endbell ? It's pressure fitted for a 3mm shaft. What i'm trying to figure out is the size the hole should be for a pressure fitted hole using a 1/8" drill bit shank. I want to press the 1/8" shaft in there and source out a different set of bearings so the pinions will be a direct fit. (1/8" = 3.17mm i believe).
Or can you buy the proper pinon for the gb long 3mm shaft ?

I'm not looking for a ripping up the sky machine. I'll be doing alot of hovering and getting into ff with my rex. Some mild acrobatics if that goes well. I think for now duration is going to be my avenue for power system. If you have any advice about me being on the right track or not , please let me know.

-T-rex with CCpm mod (jarrod/eddie)
-gy240
-berg 5
-tp 2100
-315 woddies ( i have 335's anf the stretch kit also)
-gws pico servo for the tail. (i have a hs50 but it freeked out with the pg03 i had in there)

Thanks , martin

03-04-2005 03:47 AM

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rotaryguy
Senior Heliman
Location: Jacksonville, Florida

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rcmarty,
I have never tried the suggested power plant that jarod built, I just gotta be different or try to find something better.

As far as the extra stators, I couldnt say for sure. So far I have only done one that way and it was a different wind than all the others so I have no baseline comparison. I should build another the same with the exception of the extra stator plates and test it out. hhmmmm????

The mags for the double are 10*4*2

As far as the GBX end bell, not sure if you will be succesfull with the .125 drill shafts, they are very brittle IMO. I would ask around for the right size for a press fit but I would guess only a few .00* difference would make a tight fit. I thought about doing something similar but I dont think you will easily find the coorect bearings, at least none that will fit in the GBX mounts. I have seen .5 mod pinions for sale from allerc that are 3mm shaft and go up to 14 tooth size here is the link..
http://www.allerc.com/product_info....roducts_id=1488

As far as advice I am no expert, I will try anything though. lots of parts. but for FF and basic aerobatics this setup is fine, not so forgiving learning 3D if you need the "Oh Crap" recovery power. Another interesting thing is I usually run the 305's but I just had to try the new align carbon blades for $20 and they are very heavy at almost an ounce EACH but they fly very well in my testing so far, smooth and quiet.

If you can replace all the links with the newer, tighter ball joints it made a world of difference on my heli, gives it that heavy larger feeling at low rates, comfortable to just take out and hover or practice "nose in" in the living room

03-04-2005 04:07 AM

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FISH
Heliman
Location: Wooster, Ohio

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Align speed control set up

I am having trouble setting up my align speed controler, the biggest problem I am having is when I throttle up the heli spins half way around the throttle curve is only set a 5%. Plus I never really set it up it just worked is there someone who can help me make it right.

03-08-2005 06:13 PM

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kgraehl
Heliman
Location: Thousand Oaks, CA (Ventura County)

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this topic is not about your speed control beginner problems.
start your own topic

i would answer you question if i knew what you meant in your question.

i have a align 25amp speed control.
my normal flight mode setup is as follows.
curve 1 -0% throttle
curve 2- 30% throttle
curve 3- 70% throttle
curve 4- 90% throttle
curve 5- 100% throttle

do you need help with radio setup?
or help with programming the speed control?
are you sure you have the speed controll plugged into channel 3?
are you ccppm or mechanical mixing?

03-08-2005 06:41 PM

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helicopterMark
Key Veteran
Location: Rumson, NJ

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The align speed controls do that, not much you can do about it, no soft start option or anything, just try to get used to it and anticpate it, if you bring your throttle up real gentle you can get the spin to less than a quarter or eigth of a rotation. If it really bothers you, you can get a CC35 with with soft start. not to hound on you but it is a good idea to start a new topic if the issue doesn't relate to the current one, but I wanted to at least answer your question.

Mark

Mark Schneider
Team MRC/Hirobo; Rotor Rage; Beam
Turbulence D3 | Hirobo 50 SDX | Beam E4

03-08-2005 09:08 PM

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FISH
Heliman
Location: Wooster, Ohio

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No need to be nasty

I already did all the conversions in this thread and have been following it for a while now I have also been up and flying for a while now and I am not a beginner just new to electric helis. Just wanted to know if anyone had any suggestions. The speed controller just worked right off the bat without me doing any set up, just wondered if anyone had any suggestions No need to get snoddy kgraehl.

03-09-2005 05:15 AM

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kgraehl
Heliman
Location: Thousand Oaks, CA (Ventura County)

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i hope no harm was done and all are friend here
if not got to hell and fry you bastard

lets just be friends fish
i was truly helping out
i spent the time to try to understand knowing i have been in your spot with electrics.
i once started out in glow and am no converted FOREVER to electrics.

just don't be afraid to post your own topic.
it's just when you post in this topic which hasn't had much going on in the past few weeks all of us are waiting for some updates for a "45 minute extream acro on 3s 340 kokams"

or something ground breaking.

just post you own topic
seriously no harm done.

03-09-2005 07:15 AM

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averen
Veteran
Location: Austin, TX

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Hey All,
Well I did the eCCPM mod...what a massive difference! I can't believe how well this heli flys now...before it felt a little soft on the controls...plus if I put in right, it would go right and forward, well, all that is gone now!!!

I'm getting longer flight times too (probably close to 20 minutes on a 2100 pack)! I put the 15T pinion on the motor and it works much better, plus my ESC isn't over heating anymore

. My head speed is a little on the weak side rignt now (about 1800) so I'm going to look into those Eco gears mentioned earlier and see if I can get a 17T or so. That would put me around 2000 RPM. But I would really like to be around 2200...but I'll take what I can get.

So...as for this .5 modulus gear thing. I noticed that the heli is MUCH quieter with the "correct" gears on it (you don't have to say you told me so) I would really like to get a 18T or 19T gear, but I don't think that will happen in a .5 modulus gear

So ... if I can't find one I want to at least try a 48 or 64 pitch gear. Any clue which would be the lesser of two evils here?

Thanks!
Jared

03-15-2005 02:43 AM

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e-Align T-REX 250-450-500-600 > Are you ready for this? 464gram T-Rex w/ 20 min fly times on a 1200mAH

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