RunRyder - 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

Jarod
Veteran
Location: USA

Ok I knew that would get your attention. For a few weeks I have been going on the weekends to my local AMA field. There has been a totally custom eCCPM T-Rex out there that weighs nothing and fly great. Flips, Rolls, great flying heli. This mod costs virtually nothing. Its free. Im not the person to come up with it but he said I could share these photos and some info about it on RunRyder. Great idea im looking forward to taking on this project soon. He had a custom CF frame he built that was very impressive. I thought best not to post pictures of his prototype CF frame. He is working on getting them made in much larger batches. Its complete frame repalcement with some serious changes to where things will be mounted. I can say more but wont due to the senstive nature of idea being copied. I will let him give the go ahead to post pics. But I can post pics of his heli that he has modified without spending a dime virtually. Here you go enjoy. A few facts"

AUW 406grams with battery
Home built motor. Cd Rom motor from slofly, 11 turns, 14 mags, 2 stator. It pulls a max of 4 amps. He can run it on a 10 amps speed cotroller. Unbelivable. He gets easy 20 min fly times on his 1200 packs. While I get 9-10 min on my 2100 packs.

Ok ready here are the pics I got out at the field today. I didnt think to get one of it in flight, duh. It flies great though from what I saw. Im a tough critic. If you have any detaled questions that I cant anwer I will forward them to him. I am encouraging him to produce a cheap CF frame that can be easily addapted to this setup while lightening it even further. He has a prototype that I saw today.

01-09-2005 12:08 AM

Charley Stephens
Senior Heliman
Location: North Port ,FL

Jarod,

You can get motor parts cheap from gobrushless.com its were I buy mags and stators here is a pic of the motor on my cnc carbon gun I built

01-09-2005 01:05 AM

ozzie111
Heliman
Location: Waco, Texas USA

Hello,

Thats great. Can you find out what gauge the wire on the motor is?

Oz

01-09-2005 01:27 AM

helicopterMark
Key Veteran
Location: Rumson, NJ

4 amps? are you serious? that just doesn't seem possible... but if it is tell him to make a few dozen :-) looks like a great setup, I like how he put those servos in that wasted area behind the mast, looks sharp!
Would love to hear some more details, tell your friend good job,

Mark

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

01-09-2005 01:59 AM

HOMEPAGE

iainc
Senior Heliman
Location: Brit living in Kirkland, WA, USA (got very lost on

Quote
4 amps? are you serious? that just doesn't seem possible...

Well that would be (assuming 3 cell pack) a shade under 50 watts/pound. This sounds a wee bit low, but it works - so who cares about the science?? Scientifically a bumble bee can't fly - but noone told it.

Congratulations! 1200mAH packs are a lot cheaper than the TP2100s

, and CD-ROM-based motors are easy to make, light and cheap.

Regards,

Iain

01-09-2005 02:14 AM

Torkroll
Senior Heliman
Location: Bakersfield Ca

You might as well try it without boom supports -- 398 grams ? ?

? ?

01-09-2005 02:22 AM

Gyronut
Elite Veteran
Location: Martinsville In.

Sounds like Happy Talk to me.

Rick

01-09-2005 02:56 AM

Dr Honda
Senior Heliman
Location: pittsburgh pa

HUmmm...

I think I'm goign to have to call bull **** on this one. I have put mine on a diet, and my ready to fly weight is 585g right now. (with a TP1320 3s and conopy) there is no way he shaved off 180g more than me by doing a CCPM mod. I would think 506g... but not 406g. (mine has partly cut frames, electron 6 in shrink wrap, no tail boom uports, no horizontal fin, G10 tail fin, 400s motor, etc) the only thing I didn't save weight on was my 401 gyro... but that's only around 12g heavery than the little Zoom/tellabee gyro.

Either way... I'm sure it flys great at 506 grams because that's 50g lighter than my Shogun. And... my shogun only pulls 7.5 amps on average... so 4 amps isn't unreasonable. (in a hover)

I would like to see this one on a scale to prove me wrong. Please prove me wrong... I want to go lighter with mine... not bigger. (I'm anti-strech kit)

Find out what gauge wire he used in his motor... and what pinion he is using. (I would like to build one)

01-09-2005 03:51 AM

rerazor
Elite Veteran
Location: Mich.

Just for reference what does a stock T-rex weigh?

01-09-2005 03:54 AM

Dr Honda
Senior Heliman
Location: pittsburgh pa

the stock weight is 320g (no electronis or motor)

01-09-2005 03:58 AM

jetkuo2
Senior Heliman
Location: LA, US. and Taiwan

I agree with Dr Honda! I think even carbon frame is used with CCPM, 406g is simply not quite possible, was 406g a typo?

01-09-2005 04:38 AM

Lowell Foo
Senior Heliman
Location: Vancouver, BC, Canada

1200 3s pack 80g
4 x servo 32g
Rx 8g
CC10 6g
Gyro 12g
CD motor 50g?

total 188g

Walt's main shaft -10.9g
CCPM conversion, frame cutting -40g?
Al landing gear -11g
CNC swash -2.2g

total -64.1g

So what does the kit weigh? If it's in fact 320g w/o electronics or motor, the above setup would be 444g. What's missing?

01-09-2005 05:27 AM

HOMEPAGE

Tyler
Key Veteran
Location: Chicagoland area

I want to see some video of this heli flying.

Then, I want a detailed shopping list for everything.

Tyler

01-09-2005 05:42 AM

buells2t
Heliman
Location: Henderson, NV

I don't know what his Cd Rom motor from slofly weighs or what a 440s does, however my 400L weighs 73.8 gm.
The hacker e-flite E-49 I’m running in my T-Rex weighs 52.0 gm (runs cooler as well)

Mike

9 CAP
Raptor 50
TRex 450X, Align 400l, 13T Pinion, CC PHX 35
http://www.iamw.com/rc

01-09-2005 07:28 AM

HOMEPAGE

tele3030
Senior Heliman
Location: Singapore

Yeah I am a bit sus on this one too I think it might have been a typo.

mine is 498g with etec 1250s 400s motor , ccpm home made upgrade, dreamel diet, 9g canopy, Home made landing gear, 6 g gyro ..same that he has. and a 8g RX.
I also make my own main shaft at 4g each ( al tubing with CF rod down the middle)

I could shave about another 20g off max it but at what cost.
my current draw at the momment is about 8A in hover. the main problem that we have is that the rotor disk is rather large and the blades are thick..so ther eis no way that we can reduce the current draw below a point.

Just my two cents worth

cheers all

01-09-2005 07:41 AM

Hoverup
Elite Veteran
Location: Gulf Coast

Time to send the scale to the "cal" lab me thinks

Cheers - Boyd
AMA80393
IRCHA 3355
Major USAF
Retired

01-09-2005 10:10 AM

tele3030
Senior Heliman
Location: Singapore

it could actulat be 406g without batts ..that what me thinks

come to think of it I am almost sure of it. It would come to about 405ish g is with out the batteries.

cheers doug

01-09-2005 12:21 PM

Jarod
Veteran
Location: USA

I knew it would be hard to swallow. Thats why I grabbed the pics. I will bring my digitial scale out to the field today. Hopefully he will be back out there today. He actually quoted 14.5 ounces in the total weight. I like to look at things in grams so I just did the conversion. The scale wont lie so we will see for ourselves. Hes buidling a receiver, he builds his own motors, god knows what else. Eddie can confuse even the best of us with his knowledge of electronics. I go to him when I have questions about batteries, motors, servos, and more.

I will bring the digi scale and confirm or unconfirm his heli to be 14.5 ounces. AUW

I made sure to clarify with him that the weight was with the battery and he told me yes. We will see and so shall you.

Ill also ask about wire guage and pinion size.....
.
.

01-09-2005 01:13 PM

ozzie111
Heliman
Location: Waco, Texas USA

Jarod,

Will you also confirm that the motor has 14 magnets, and how many
poles. Also could you ask if it is wound delta or star. For people who
don't mind winding their own motors, this could be the ticket.
Thanks again Jarod for posting the info on this bird.

Oz

01-09-2005 01:28 PM

Jarod
Veteran
Location: USA

I wrote down this about the motor. Its a build it yourself cdrom motor from slofly with:
11 turns
14 mag
2 stator

Ill ask him about the rest.

01-09-2005 01:37 PM

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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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