RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 2307 views POST REPLY
HelicopterScale Model RC Helicopters › Trex 700E Long Ranger .60 Maiden flight on 6 cell!
08-09-2009 04:36 PM  8 years agoPost 1
rjhpilot91

rrApprentice

somers point, nj

My Posts: All  Forum  Topic

Finally got the longer ranger flight ready this morning. It is running on a 6 cell 5000mah battery. I didn't go overboard on the detail on this one like my stingray since I was pressed for time to get it flight ready. Here's what it's got:

Trex 600 stretched to 700 boom
Radix 710 mains and align 105 tails, both painted
Zippy 6s 5000mah battery
2 5V fans for ESC cooling
Stock Align 600L motor and ESC
Eagletree sensors
GY401/9254
Cyclic 9202
No RX pack
2-Zippy 2s 1800mah packs for lighting/cooling fans
RPM 900

It did vibe quite a bit in the pod and boom configuration, and I was worried about that going into the fuse. Sure enough on the first lift off, the front canopy came flying off and the helo started to vibe really bad. No damage fortunately.

I managed to play with the throttle curves to get the helo to be much smoother, however I may consider adding side brackets to the sides of the frame to get rid of some of the lateral play thats causing some of the vibes.

It looks great in the air and has a very scale feel to it. Not too much power, but enough to have a decent reserve in case the pooch gets screwed.

Oh and the skids are made by JESTRR. They are excellent and worth the 2 month wait. I can't imagine a Ranger without these scale skids.

Helicopters don't fly, they beat the air into submission!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
08-09-2009 05:50 PM  8 years agoPost 2
Mike Bilyk

rrApprentice

Tulsa, OK - USA

My Posts: All  Forum  Topic

looks really good.

get that sucker painted and maybe throw a FBL head on it

AMA # 617778
Team MasterCard

PM  EMAIL  GALLERY  Attn:RR  Quote
08-09-2009 06:38 PM  8 years agoPost 3
GrantL

rrVeteran

Springfield, MA

My Posts: All  Forum  Topic

Oh Mike (JESTRR) does nice work just for the praise.. Hi Mike.... He made my set also.. Nice job.. get it painted.

Grant

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
08-10-2009 01:33 AM  8 years agoPost 4
Rodan

rrVeteran

Prescott Valley, AZ

My Posts: All  Forum  Topic

Looks good, but I hope I misunderstood that you're running 900 headspeed??

You should be up around 1400-1500...

You also need to anchor the mechanics to the fuse as close to the mainshaft as possible. I used an 'L' bracket from the mechanics back to the flange where the front/rear fuselage parts join. I don't have any pics handy, but I'll try to post something tomorrow...

PM  EMAIL  Attn:RR  Quote
08-10-2009 12:05 PM  8 years agoPost 5
rjhpilot91

rrApprentice

somers point, nj

My Posts: All  Forum  Topic

Rodan,

Yeah I was running 900 as a pod and boom until the maiden flight with the fuse and it almost shook itself apart. I've got a thread on my ultralow headspeed project.

I did put some plastic braces on the mechanics up higher now and that seemed to help. The key to getting the vibes to smooth out was upping the headspeed, which unfortunately killed my flight times. I was getting almost 16 minutes as a pod and boom and now I'm back down to 8. Not bad I guess for a 90 size bird powered by a 6 cell battery.

I finally got it smoothed out enough to take it for a few laps and it sure looks good in flight. Heres a couple more pics of the bird. The 2 cooling fans are mounted under the esc.

Helicopters don't fly, they beat the air into submission!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
08-10-2009 12:45 PM  8 years agoPost 6
Wozza_au

rrNovice

Adelaide South Australia

My Posts: All  Forum  Topic

Hi
Nice heli
Im wondering as your running an eagletree if you could post the max amps
You ended up pulling,also what is the AUW of the heli.Im interested as Im converting an old nitro scale to electric and want to run a 6S setup
Wozza

PM  EMAIL  GALLERY  Attn:RR  Quote
08-10-2009 02:01 PM  8 years agoPost 7
coptercptn

rrElite Veteran

Mesa AZ. USA

My Posts: All  Forum  Topic

those 710 have to be really maxxing out your motor/esc...I tried 680's on my cobra and everything got REALLY HOTTT!!! working on another option now, Cuz I really want to go 680 FBL...on it. I agree post some amp numbers if you have them "Curious minds like to know"..

Home of the "Sea Cobra".....

PM  EMAIL  GALLERY  Attn:RR  Quote
08-10-2009 04:55 PM  8 years agoPost 8
rjhpilot91

rrApprentice

somers point, nj

My Posts: All  Forum  Topic

Heres the link to my low headspeed project. It goes over all the details of how I made this project possible with the stock setup and a 6s battery.

http://runryder.com/helicopter/t520671p2/

The average amperage pull is 20-25 Amps in mild circuits. I've seen spike up to 50 for full power climbouts. Now that I had to up the headspeed to get rid of the vibes, I'm pulling 25-30 continuos. Still not bad on a 6s battery.

CopterCptn

Yeah the ESC got real hot with this throttle curve 0-25-40-55-70. It wasn't very efficient at that range and got prettywarm so I added 2 PV 5V fans directly underneath it for cooling and it works like a champ. It gets the esc from about 185 degrees normal to about 125 with fans on.

It wouldn't be possible to run the 6s battery without dropping the headspeed. I ran it once with normal throttle curves and was pulling insane amounts of amperage. Unfortunately the fuse aadded about 3 pounds so now I've lost quite a bit of flight time, down to about 8 now.

I'm still contemplating putting the scorpion 565KV and CC85HV in it and running them in series for real long flights.

Helicopters don't fly, they beat the air into submission!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
08-10-2009 05:05 PM  8 years agoPost 9
Wozza_au

rrNovice

Adelaide South Australia

My Posts: All  Forum  Topic

Thanks for the info
If you do end up running the scorpion 565KV and CC85HV please let us know how it go's,as thats the setup Im looking at getting
Thanks again
Wozza

PM  EMAIL  GALLERY  Attn:RR  Quote
08-10-2009 07:17 PM  8 years agoPost 10
Rodan

rrVeteran

Prescott Valley, AZ

My Posts: All  Forum  Topic

FYI, I am running a Tango 45-08/ CC-85HV on 8S in my Jet Ranger, which is also a stretched TRex 600E. I'm running OF 670 airfoil blades, and getting easy 8 minute flights at 12.5 lbs out of two 4S4000 packs in series. Average in-flight amps is around 24, with 28-30 on climbouts.

PM  EMAIL  Attn:RR  Quote
08-10-2009 08:33 PM  8 years agoPost 11
RodanrrVeteran - Prescott Valley, AZ - My Posts: All  Forum  Topic

One of the real problems with scale helis is the resonance you can get when you add a fuselage to a pod/boom heli. You experienced this with your low headspeed. It is also critical to have the mechanics solidly mounted, top and bottom. When I first built my Ranger, I used light aluminum material. It was not up to the task, and I had a resonance problem I chased for months until it actually cracked one of the brackets. I replaced them with heavier brass material and the problem went away. I also flipped the brackets so the mounting point was closer to the mainshaft, and left them a little long to add support past the mounting bolt.

Here's some pics of my upper mechanics mounts, they're not the prettiest, as they were modded after the initial build, but they work.

First, is a former I added behind the fiberglass flange:

Here are the brackets, which are epoxied in with Aeropoxy:

PM  EMAIL  Attn:RR  Quote
08-11-2009 11:48 AM  8 years agoPost 12
rjhpilot91

rrApprentice

somers point, nj

My Posts: All  Forum  Topic

Thanks for the pics Rodan. I too have built some brackets but I made them from plastic cause I've had some metal brackets crack at the bends. I'll get some pics of them up tonight.

Adding these brackets and upping the headspeed got rid of the vibes for me. 2 test flights so far and more today hopefully.

Helicopters don't fly, they beat the air into submission!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
08-11-2009 12:25 PM  8 years agoPost 13
stanc

rrKey Veteran

Conroe, TX

My Posts: All  Forum  Topic

You've got to be putting a lot of stress on the ESC, Motor and Batteries, using 6S in a heli swinging 710 blades and in a fuse to butt. But then I guess with a Trex 600 the motor options are limited.
Unfortunately the fuse aadded about 3 pounds so now I've lost quite a bit of flight time, down to about 8 now.
Is that 8 seconds, can't be 8 minutes. If it is 8 minutes then you need a new timing devise or your kidding yourself. A Trex 600 with a stock canopy can't fly for 8 minutes, unless you had a 10,000 mah pack.

Stan
2- Logo 500
Ion X2
eAvro90

PM  EMAIL  GALLERY  Attn:RR  Quote
08-12-2009 11:55 AM  8 years agoPost 14
rjhpilot91

rrApprentice

somers point, nj

My Posts: All  Forum  Topic

Stanc

You must fly 3D. With a stock Trex 600 running a normal sport curve I got 9-10 minutes. I dont require insane headspeed for sport flying.

Thats 8 minutes now.

The batteries are loving this new curve. It keeps the batteries extremely cool since the ESC isn't sucking that much power from them. The motor is also cool because the ESC isn't using that much power from it. Yes the ESC is being abused but the temps are being cool due to cooling fans. My max power at the top of my curve is 70%. I had a whole thread with this project but I've got the eagletree data to prove that my heli is more efficient than a stock Trex 600.

Helicopters don't fly, they beat the air into submission!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 2307 views POST REPLY
HelicopterScale Model RC Helicopters › Trex 700E Long Ranger .60 Maiden flight on 6 cell!
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Friday, April 20 - 2:26 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online