RunRyder RC
 4  Topic Subscribe
WATCH
 1 page 2469 views POST REPLY
Helicopter
e-
Mikado
Other › Pinion & Main Gear Question for Logo 500SE & 600SE
01-14-2011 10:23 PM  7 years agoPost 1
LV heli

rrNovice

Allentown, PA

My Posts: All  Forum  Topic

I am relative newcomer into RC helicopter world. I have graduated over last 12 months into bigger helis and presently have three lovely Mikado Logo's: 500 FlyBar'ed, 500SE FBL and 600SE FBL. I have learned a lot from this forum and would like to ask a question from more experienced pilots:

How do you (really) determine:
the best ratio of main-gear to pinion based on battery (i.e. 10S vs.12S or 6S vs 8S)
what main gear to use? (Mikado has 2 I believe for 500 and/or 600)
what kv motor to use depending on pinion? battery?

Maybe someone can direct to me to the resource I can use? So far I have used recommended settings my ReadyHeli or as recommended by others on this forum.

More specifically:

What needs to be done to use 8S battery on Logo 500SE (presently with Scorpion HK-4025-1100 6mm shaft with MIK4315 Mikado 15 Tooth Herring- bone Pinion, M0.7, dia. 6mm)

What needs to be done to use 12S battery on Logo 600SE (presently with Scorpion 4035-500 motor with a 12t pinion).

Thanks in advance!

PM  EMAIL  GALLERY  Attn:RR  Quote
01-14-2011 11:53 PM  7 years agoPost 2
Lovelight

rrNovice

Bellevue, WA

My Posts: All  Forum  Topic

The answer to your question can be quite involved but your first step is to determine your target headspeed. What blades are you flying on each and what is your level of flying ability? Readyheli's recommendations are likely to be a bit hot for your current skill level although I have heard of folks going hard 3d in a year with daily practice.

PM  EMAIL  Attn:RR  Quote
01-14-2011 11:55 PM  7 years agoPost 3
Anthony.L

rrElite Veteran

Seattle, WA

My Posts: All  Forum  Topic

The ReadyHeli headspeed calculator tool is the holy grail you are seeking. You can play around with the battery size, motor KV, and pinion size to find the right combination for the desired headspeed.

http://www.readyheli.com/headspeed-calculator.html

For the Logo 500SE w/ 8S you will want to get a motor approx. 800KV. Scorpion makes a 4025-890 that would work nicely.

For the Logo 600SE w/ 12S you will want to get a motor approx. 450KV. Scorpion makes the 5025-440 that is designed specifically for the 600SE.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2011 12:24 AM  7 years agoPost 4
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

For what its worth...

When it comes to electrics, regardless of heli brands, your best approach is to find your targeted head speed FIRST then the rest comes into play.

Why? A "matched" efficient running machine thus the perfect combination. Longer running time, cooler temps and in the long run money in your pocket for spare parts.

First we find out how fast your motor will spin based on battery selection. Based on some of your info...

RPM = KV x V x Motor Efficiency (80% = .8)

1100KV x 29.6V x .8 = 26,048 RPM.

Now lets find out GEAR RATIO based on desired head speed. We will shoot for 2200 head speed...a very spirited performance with faster battery drain on a heli spinning 515mm CF blades.

GR = RPM / HS

26048 RPM / 2200 HS = 11.84 Gear Ratio

now lets find the Pinion

Pinion = Main Gear Teeth (MGT) / Gear Ratio (GR)

153 MGT / 11.84 GR = 12.92

So a 13T pinion is ideal for a 2200 head speed.

Higher count pinion = lower head speeds

Hope this helps you determine your own needs and wants.

Best of luck!

~~Enjoying the hobby one flight at a time~~

PM  EMAIL  HOMEPAGE  GALLERY  BLOGAttn:RR  Quote
01-15-2011 02:25 AM  7 years agoPost 5
LV heli

rrNovice

Allentown, PA

My Posts: All  Forum  Topic

Thank You for all the advice! Pistol_Pete review and breaking it down to simple steps was really excellent and easy to understand. Thanks again!

BTW: How do you determine (approximately) the recommended headspeed based on the main blade length?

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2011 06:28 AM  7 years agoPost 6
Lovelight

rrNovice

Bellevue, WA

My Posts: All  Forum  Topic

Headspeed for a given blade length will vary based on your preferences as a pilot. Novice pilots will benefit from a slower headspeed as it will be more docile and forgiving. More advanced pilots with an aggressive flying style need a higher headspeed so the heli is responsive enough to perform extreme aerobatics.

If memory serves I believe the 500 pilots run in the 2200-2600 range and the 600 pilots are in the 1800-2200 range. But I would recommend combing this and other forums for threads with similar blade lengths as yours to be sure. You may even find threads started to document different power system/headspeed/blade length combinations. ;-) Larger rotor disks will have lower rpms. Too high a headspeed is potentially dangerous due to physical stresses on the grips and other parts of the rotor head.

Pay attention to the flying style these other pilots state. If they are flying hard 3D and you are just building your skills, you will want to run 10%-15% slower. You may want to be even a little more than that. And try to set it up so your throttle curve/governor mode is between 70%-95% with 80% or so being roughly optimum efficiency for your motor.

These are really rough guidelines and there is some subjectivity involved. PM me if you need additional direction as there is guidance I can give you best suited for that mode of exchanging information.

PM  EMAIL  Attn:RR  Quote
01-15-2011 12:05 PM  7 years agoPost 7
LV heli

rrNovice

Allentown, PA

My Posts: All  Forum  Topic

Thanks Lovelight!

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2011 02:39 PM  7 years agoPost 8
SGrim80

rrVeteran

Lehigh Valley, PA

My Posts: All  Forum  Topic

Good info, just to add I think 3D pilots flying 600SE's are using about a 1900-1950 headspeed on 690mm blades.

Your 500kv motor on a 12T pinion on 10s will give you about 1900 headspeed. You would need to drop to an 11T pinion on 12s and about 60% throttle for 1900 headspeed thus the reason a 450kv motor was previously recommended for 600SE.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2011 05:33 PM  7 years agoPost 9
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

How do you determine (approximately) the recommended headspeed based on the main blade length?
Check your machine specs for recommended MAX head speed as well as MAX blade lenght it can spin.

The smaller the blade the higher the head speed.

For example, my machine can swing 550mm up to 2100rpm with the plastic head and higher with CNC.

Wooden blades only up to 1800rpm. This is a limitation on the blade and not machine.

Here is what works for me: RPM / Watts avg consumed per minute
Normal 1600rpm / 350W avg Scale flying
Idle 1 1800rpm / 500W avg Spirited Acrobatics
Idle 2 2100rpm / 650W avg Even higher performance.

You find the head speed to accomodate YOUR flying style and needs.

~~Enjoying the hobby one flight at a time~~

PM  EMAIL  HOMEPAGE  GALLERY  BLOGAttn:RR  Quote
01-16-2011 03:04 AM  7 years agoPost 10
LV heli

rrNovice

Allentown, PA

My Posts: All  Forum  Topic

Thanks to everyone. I have got down the basics and will calculate and experiment in real flying. I really appreciate your time and advice!

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 2469 views POST REPLY
Helicopter
e-
Mikado
Other › Pinion & Main Gear Question for Logo 500SE & 600SE
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Wednesday, January 24 - 5:50 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online