RunRyder RC
 1  Topic Subscribe
WATCH
 1 page 617 views
Scorpion Power Scorpion Power
HelicopterMain Discussion › anyone got a calculator?
07-08-2008 04:31 AM  9 years agoPost 1
eyeflyhelis

rrElite Veteran

charlotte nc

My Posts: All  Forum  Topic

so like the title says anyone got a calculator? whats the max rpm a hyper 50 engine can turn a k3d head at 100% throttle?
os max rpm = 20,000
i figure a rough guess under load to be 18500 -1900max under load
heli gear ratio = 8.7:1:5
if reading that correctly its 8.7 :1 on the main and x5 on tail
so that would =
20k= 2298 headspeed
18.5k=2126 headspeed
19k= 2180 headspeed
therefore meaning that if you can safely turn your head 2300rpm (in theory with CF blades) then you can run 100 straight across the throttle curve and at 0* pitch not over speed your engine or head.

95% of engine is 19k that where that # comes into play so if someone ran an engine at 95% throttle curve flat they should be safe with out ever overreving.
if this is the case that would mean you can just run 95% throttle and never need a governor.

thoughts?
anyone ever try it?

only you have the power to make no difference!

PM  EMAIL  GALLERY  Attn:RR  Quote
07-08-2008 04:43 AM  9 years agoPost 2
jphilli

rrKey Veteran

Atlanta, Ga.

My Posts: All  Forum  Topic

Bad idea. I think the 20k max means the max the engine can take not do. The engine can probably rev a few hundred rpm higher than that then poof.

Also, what will happen when you have that 95% flat line curve and the heli falls in the direction of gravity? You're gonna over speed the head big time.

Plus, talk about inconsistency. The gyro is tuned for a certain RPM. When the tail is +/- 10% rpm at any given time, you're either going to be blowing out the tail big time or it gonna hunt like crazy.

If you do decide to do this Tom, make sure you're far from anyone else.

PM  EMAIL  Attn:RR  Quote
07-08-2008 04:50 AM  9 years agoPost 3
eyeflyhelis

rrElite Veteran

charlotte nc

My Posts: All  Forum  Topic

If you do decide to do this Tom, make sure you're far from anyone else.
i run throttle jockey pros. im just sitting here at work bored and trying to come up with new theories of relativity to help save the universe.

only you have the power to make no difference!

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 617 views
Scorpion Power Scorpion Power
HelicopterMain Discussion › anyone got a calculator?
 Print TOPIC  Make Suggestion 

 1  Topic Subscribe

Wednesday, November 22 - 11:20 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online