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

Jarod
Veteran
Location: USA

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Barry Janzen, Yes your right it is delta wiring. This week im going to sit down with him and build a motor. I spoke to him again and he has all the parts at his house. He has part numbers for everything needed so people can order them. He doesnt have internet at his home.

Some people must think we are still living in the dark ages.

Here are the parts I will be using for my build up so far. The parts below have been ordered and I will confirm weight specs as I build it up. I will have to get back to you on the motor parts for now but here is what Im doing. By the way there is no off the shelf motor equvilant. If im wrong that would be fine. The motor needs to weigh around 35-45 grams. The closest AXI match is about 37 grams heavier and $50 more then the one you make yourself. So for me Ill try and wind a motor. If you learn this skill you can make motors for all kinds of projects for dirt cheap. Plus you can pick up chicks with em too.

T-Rex 450x kit
Berg 9.5 gram receiver
Castle Creations 10 ESC
CSM HLG200 with Heading Lock - Lightened Version
Thunder Power 11.1v 1320mAH battery

Lets do some preliminary math here to see were we will be weight wise.
T-Rex 320g
4 Pico servos 21.6g
Berg Receiver 9.5g
Castle 10amp ESC 6g
HH Gryo 6g
TP 3 cell 1320mAh 81g
Build it yourself motor 40g
Total weight is 484.1 grams

Then you use a few tricks to lighten it up even further. Convert to CCPM, Shave down the frame, use CF where possible, etc....
Those weight specs are from the manufacturers websites. Please correct me if im wrong on any of those. These numbers are looking great and this is still using a stock setup. Im sure we can get it down to near 400 grams when Im done with the ccpm setup and CF parts replacements.

EDIT:
Here is a different lightened T-Rex that I created a month ago. Its got the stretch kit on it and it weighs 300g (20g lighter then a stock unstretched kit) and its still using the stock configuration for those who arent interested in CCPM. The best benefit from CCPM is actually the removal of most all the slop in the controls. The fact that it drops a few healthy ounces off of it is just a plus.

01-12-2005 02:13 AM

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tele3030
Senior Heliman
Location: Singapore

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dont forget that most of the spec's given are not including wires too ..i found that out the hard way while building the sub 500g heli.

you can save some more weight by using a 5mm Al tubing and put a 4mm CF rod down the centre ( ca it in to place) ....cut to lenght and drill and sand to get the OD just right to fit in .....
all up weight 4g! ( I dont fly 3 d but has been good for fig 8 and general flight)

I too would like to know if the axi motor can take the trex ..I have one spare what size pinion should i use?

01-12-2005 04:02 AM

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jetkuo2
Senior Heliman
Location: LA, US. and Taiwan

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One guy at Rcgroups reported using a AXI motor with Zoom/Shogun, 5S1P 830 around mah, CC-10, Gyro proably GY-240(not remember quite well), that is a 3D bird too. That is a very light bird! So for TRex to use AXI, the key point is the weight, you need to lighten you Trex just as this thread is discusssing! This is excellent joband the extreme lightening project that can only be see here so far! Most people's Trex still have AUW over 600g!

01-12-2005 04:28 AM

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rotaryguy
Senior Heliman
Location: Jacksonville, Florida

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using a GWS rec. in a heli scares me, is it worth the weight savings? anyone care to comment on that? I use em in my foamy planes but have never had much luck in any of my helis with them.

01-12-2005 05:09 AM

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Jarod
Veteran
Location: USA

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I dont like the idea. In this build up im using a berg 5 with DSP II. They are 9.5g and the finest recievers I have used. I put one in every heli I fly.

01-12-2005 05:11 AM

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Charley Stephens
Senior Heliman
Location: North Port ,FL

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If you want to build a motor for T-rex use Go brushless end bell and double flux ring with (2) 22mm use 26awg 20-22 turns wired in delta parallel not wye or standard delta with 10x4x2mm mags you will get an approx KV of 3500

01-12-2005 05:26 AM

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rotaryguy
Senior Heliman
Location: Jacksonville, Florida

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I am following this thread and its great, but I have already taken steps towards a 4s HV setup with a 3500KV neumotor. The HV setup is great, I had all but given up on this pig but with my renewed confidence on 4s I am going to try this ccpm mod. ..More Close-Up photos of the ccpm please

Thanks again for sharing this with us..

01-12-2005 05:29 AM

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Jarod
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Location: USA

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I dont know if you noticed but on page one I did enlarge the photos this evening. I made them about 20% larger. Dont worry there will be much more detailed pics to come when I make a copy of his.

01-12-2005 06:23 AM

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Rastaman
Heliman
Location: La Suede

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Super cd motor!

Hi all!

My first post at Runryder!!!

What we all are looking for is this kinda motor.
http://www.rcgroups.com/forums/show...t=266381&page=2

It's just 40g with powers well over 25A and a Kv at somewhere around 3700-3800 depending on the number of turns etc.

The torque is crazy and it won't even get hot at 20A cont.!!!

/Stefan

01-12-2005 09:44 PM

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Jarod
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Location: USA

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Thank you for that link. That looks excatly like the motor that is being used in this super light weight CCPM project. Great contribution!

01-12-2005 10:01 PM

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Barry Janzen
Heliman
Location: Chattanooga, TN Posts: As many as needed!

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Quote
It's just 40g with powers well over 25A and a Kv at somewhere around 3700-3800 depending on the number of turns etc.

Stefan,

Welcome to RunRyder! I know you from RC Groups and you are welcome here as well!

Thanks for the info. Rysium has come up with some great motors. I can't help thinking that a higher wind motor would make more torque and lower the amps. I love my AXI 2208/20 in my Hornet 2. It has a Kv of 1880. Very little throttle is needed when pitch is added. Just have to see what I can come up with.

Still need to figure out what this "new" parallel thing is. Guess I haven't kept up with CDroms in the last couple of months.

Barry

01-13-2005 01:03 AM

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Jarod
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Location: USA

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yea I learned that the motor that was built in the rcgroups post is pulling to many amps not enough torque. Eddie said that motor wouldnt be what we want. He is coming over Friday after work. I have all the parts needed on there way here. We will build a T-Rex the weighs around 450 grams and costs a total of $500 with motor and a lipo. This project will be great for you guys. You wont need anything more then a love for building. He has made some major changes to things again. It may not look much like the pictures you will just have to wait and see. Im excited about having this T-Rex. This is knida like my perfect idea of a micro heli. We could even shorten the boom and the blades on it now since it doesnt weigh as much. All the details are soon to follow.

01-13-2005 03:29 AM

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Barry Janzen
Heliman
Location: Chattanooga, TN Posts: As many as needed!

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Jarod,

Thanks for the teaser ;-) Now I have to wait until Saturday for more info. (Please don't make us wait tooooo long!)

I to have the parts for three motors on the way from GoBrushless.com. I had most of the parts.....just needed the extra parts to make a double.

Yes the motor that has been referenced in RCGroups was just a test. It turned out to be too much motor for the Zoom. It was a 7T Delta and I think Eddie is using a 11T Delta motor. Has Eddie measured his Kv on that motor? That would be nice to know but not critical.

Anxiously waiting more info........

Barry

01-13-2005 05:28 AM

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Lowell Foo
Senior Heliman
Location: Vancouver, BC, Canada

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My TP1320 gen2 packs weigh 90 and 91 grams with micro Deans plugs.
Speaking of battery weights, what are the best cells for high discharge and light weight?

01-13-2005 06:55 AM

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electron_flyer
Senior Heliman
Location: Cape Town, South Africa

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Do we really need the horizontal stab, bracket and supports? The tail seems pretty stiff without them and leaving them off could lose a few extra grams. May need to dial the gyro gain down a few percent though.

Has anyone flown a TREX without boom support yet that can provide feedback?

01-13-2005 08:17 AM

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Lowell Foo
Senior Heliman
Location: Vancouver, BC, Canada

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It can probably work ok without the boom supports, but you're more likely to damage the boom in a crash.

01-13-2005 10:08 AM

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Rastaman
Heliman
Location: La Suede

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"Still need to figure out what this "new" parallel thing is. Guess I haven't kept up with CDroms in the last couple of months.

Barry"

Hey!

This winding is used to avoid using extremely thick wire and few turns. You can't practically use that thick wire so we parallell thinner wire to get same thickness and eaysier winding!

Rysium is the guru of these nice motors!!!

/Stefan

01-13-2005 10:30 AM

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Art-Tistic
Senior Heliman
Location: Somerset, NJ

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Hello Jarod,
Just wondering where you are at with this project? Any specs on the motor, wire gauge, number of turns, type of winding. I'm ready to start my motor build for my Astar scale rexy and would love to get 20 minute flights.

Regards,
Anthony

01-14-2005 05:56 PM

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Jarod
Veteran
Location: USA

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Tonight Im supposed to begin working on the poject. I will get detailed specs as I go through the build tonight. I will post the details as soon as It complete. Dont worry Im commited to this project and it will be realized.

01-14-2005 07:01 PM

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ozzie111
Heliman
Location: Waco, Texas USA

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Jarod,

I just wanted to say thank you from all of us attempting to get
a better flying T-Rex.
This forum makes it really nice for people all over the world to
share info.
Altruism at its best.

Oz

01-15-2005 02:03 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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