RunRyder RC
WATCH
 1 page 2322 views POST REPLY
HomeAircraftHelicopter
e-
SAB
Other › Goblin Flight time 8 to 10 min????
06-08-2012 11:44 PM  6 years agoPost 1
HeliKopter Ken

rrKey Veteran

Gray, LA

My Posts: All  Forum  Topic

Is anyone getting anything close to 8 to 10 min. If that was my goal. What setup might get me close to that time. How much performance could I get with those type times?

Thanks for any Advice and or information.

.

Aurora, Raptor 90 FBL, Logo 600SX

PM  EMAIL  GALLERY  Attn:RR  Quote
06-09-2012 12:37 AM  6 years agoPost 2
Eury

rrProfessor

Dover NH

My Posts: All  Forum  Topic

My new Goblin just gave me a 6 minute flight with 2800 out of the 5300mah 6s Gens Ace. That's with a Quantum 500kv motor, stock pinion and 2100 headspeed. I'd bed able to get 8 without harming my batts, and I'd bet 10 would be doable if I put the headspeed in the 1850 range.

Nick Crego

Citizen #0168

PM  EMAIL  GALLERY  Attn:RR  Quote
06-09-2012 12:42 AM  6 years agoPost 3
Santiago P

rrProfessor

South West, Ohio

My Posts: All  Forum  Topic

For any heli, not just the Goblin, you need to maximize the efficiency and lower the losses.

The 1st, choose a motor that is not not bigger than what you need. If you fly smooth big aerobatics, select a 3200 to 3500W motor 90% efficiency. Larger ones will run below their bes eff and it becomes a wast. Look into Xera 4030-3y smaller motors. A 5000Watt motorwould be a huge waste. Choose a blade with a narrow-ish chord like the Rails 696 or Rotortechs 700, straight taper tips.

Gear ratio: Find a gear ration that will accomodate your lowest rpm and maximun rpm with the ESC no less than 70%, and no higher than 92%.

RPM. this makes or brakes your flight time. RPMs above 2000 take double the power than 1800, and 4 times than at 1500.(this a rought estimate, dont lynch me)

RPMs around 1850 tops and 1450 cruise will yield 8-9min flights.
As you turnthe RPM, the blade drag skyrockets, andso the power required.

All this is more or less what we do in FAI, and we get about 9 minute flights at 75-80% battery capacity (5A).

Santiago

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-09-2012 01:03 AM  6 years agoPost 4
Eury

rrProfessor

Dover NH

My Posts: All  Forum  Topic

I forgot, I'm running Rail 696 blades. I wasn't a huge fan of the stock blades.

Nick Crego

Citizen #0168

PM  EMAIL  GALLERY  Attn:RR  Quote
06-09-2012 12:54 PM  6 years agoPost 5
HeliKopter Ken

rrKey Veteran

Gray, LA

My Posts: All  Forum  Topic

Does lower than 70% damage or overheat the ESC?

.

Aurora, Raptor 90 FBL, Logo 600SX

PM  EMAIL  GALLERY  Attn:RR  Quote
06-09-2012 01:54 PM  6 years agoPost 6
Eury

rrProfessor

Dover NH

My Posts: All  Forum  Topic

You're best off gearing for the speed you want rather than reducing the %. That said, I run an external governor (off the SK540) to get my headspeed where I want it, 100% would give me in the 2500 range, so I'm sure that my ESC is spending the majority of it's time at 70% or below.

Nick Crego

Citizen #0168

PM  EMAIL  GALLERY  Attn:RR  Quote
06-10-2012 04:12 AM  6 years agoPost 7
misskimo

rrElite Veteran

Alaska 17 years, before mississippi for 31y

My Posts: All  Forum  Topic

I run a 85 to 92 % on my gov, I run kontronics, I don't like to run any lower. Gearing for 92 with my gearing gets me 9 min. I run 2 different types of batteries, 12s for balls to the wall 3d, 10s for smooth smack long flight time off the same ratio.
Also, ditto on money pit. I cringe on everyone's setups with the big 4530s. These motors are for extreme 3D or extreme speeds that's needing 80 continuous amps or more. Will it run, yes, but poor results in efficiency.

PM  EMAIL  GALLERY  Attn:RR  Quote
06-10-2012 07:58 PM  6 years agoPost 8
Eury

rrProfessor

Dover NH

My Posts: All  Forum  Topic

The manual for the Helijive says to keep it below 65% to maintain governor overhead. You probably skipped calibrating your throttle.

Regarding running the larger motors for anything but hard 3d, I'm just not seeing the efficiency problem you are talking about. The motor comes down cool (124deg after 6 mins), has tremendous power and the amp draws are still low. Its a question of gearing for the speeds you want to run, the motor still spins the same speed and has the same efficiency no matter what your flying style is. The only inefficiency is the extra weight, and for me that is well worth it when you consider that the 4530 Quantum is a high quality motor and one of the lowest priced available when purchased in a combo with the kit. Is it the best choice for a more sedate setup? No, but there is nothing wrong with having extra power for when you want to crank it up, especially when that motor is so inexpensive.

Nick Crego

Citizen #0168

PM  EMAIL  GALLERY  Attn:RR  Quote
06-10-2012 08:33 PM  6 years agoPost 9
misskimo

rrElite Veteran

Alaska 17 years, before mississippi for 31y

My Posts: All  Forum  Topic

Well I'm not saying it won't work, but I'm talking about unwanted high torque to the gear train. Unwanted torque breaks sheet! If you stay close to it's power band it seams to help reduce unwanted torque .
You Know how a hot rod car or any car hits it's sweet spot above 3500 rpms and pulls like a brick sheet house. I stay at the curve is my way. A safe way, and geared for that way, I recon my helis are like kids. Don't want to hurt them. Wish I could claim them on my taxes.
But you don't have to listen to me though

T

PM  EMAIL  GALLERY  Attn:RR  Quote
06-10-2012 08:48 PM  6 years agoPost 10
Eury

rrProfessor

Dover NH

My Posts: All  Forum  Topic

I want that torque. I don't see the Goblin having problems handling high power setups, and electric motors don't have a power band, they produce 100% of their power from 0 RPM on up. Having a huge high torque motor allows the use of lower headspeeds without bogging, gearing being correct, of course.

Nick Crego

Citizen #0168

PM  EMAIL  GALLERY  Attn:RR  Quote
06-10-2012 09:20 PM  6 years agoPost 11
epc2

rrVeteran

Miami , Fl./S.Domingo.

My Posts: All  Forum  Topic

Having a huge high torque motor allows the use of lower headspeeds without bogging, gearing being correct, of course
+1

epc2.

Team My Wallet.

PM  EMAIL  GALLERY  Attn:RR  Quote
06-10-2012 09:36 PM  6 years agoPost 12
QuantumPSI

rrElite Veteran

Atlanta, GA

My Posts: All  Forum  Topic

WoW, ummm, quite a bit of information in here. Not going to challenge any points, but I'll state what I've found in my own experience and leave the physics out of it.

I'm running the Xera 4350 motor on 22T (big bore motor). I'm running 2000HS. When I'm flying balls to wall, hitting the collective and cyclic extremes, I'm taking out about 3600mah from my 4400s in a 4 minute flight. With 5000s, it would be a little less than 4:30.

When I'm practicing certain things which doesn't take much power, I can push 6-8 minutes comfortably, again this is at 2000HS.

I do intend to drop the pinion to 21T to get more flight time. I have plenty of overhead left in the gov for this to work turning the same 2000HS.

With 1850-1900 on the head, 5000 packs, and a proper gear ratio (19T probably), you should be able to hit 10+ no problem flying LIGHTLY.

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

PM  EMAIL  GALLERY  Attn:RR  Quote
06-11-2012 06:35 AM  6 years agoPost 13
OICU812

rrMaster

Edson, Alberta, Canada

My Posts: All  Forum  Topic

LIGHTLY would really be the key word indeed to even have half a chance.

...Once upon a time there were Nitros, flybars and frequency pins...

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 2322 views POST REPLY
HomeAircraftHelicopter
e-
SAB
Other › Goblin Flight time 8 to 10 min????
 Print TOPIC  Make Suggestion 

 5  Topic Subscribe

Friday, August 17 - 8:16 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online