Ultra Low-Speed Rotor System heli flight at HHAEFI 2010

Sunrise flight of my ultra low-speed rotor system demo heli.

This helicopter is based on a Miniature Aircraft ION-X (V1) chassis with special mods to allow 950mm main blades.

Head speed is only 600rpm which produces a more realistic visual appearance and blade sound.

The power supply is via a pair of long 6S, 4960mah LiPo packs placed as far forward as possible to help balance the extra long tail boom assembly. With these packs this helicopter has a theoretical flight time of roughly 25 straight minutes.

Flybarless stabilization is handled by a pair of CSM, ICG720 gyros mixed through a V2 Helitronix mixer unit. The rotorhead is a custom piece made from parts of an old Hirobo SSR II head, GMP Competitor head and self-made pitch arms.

I don't have plans on wrapping this chassis inside a scale fuselage but the results of the flight tests will go a long way to allowing a successful scale heli creation. Low tail rotor authority is the prime limiting factor in trying to lift any significant loade as there's no practical means of obtaining a faster tail rotor rpm using this design chassis. Extra long tail blades (140mm) have partially compensated for the low thrust but ground clearance is a major issue.

So this project has stagnated for now. It does fly very nicely and the best way to describe its flight feel is to compare it with the response of a sail plane.

Thanks for watching.

Category:

Science & Technology

Tags:

• Rotor Head
• RC Heli
• Electric RC Helicopter
• scale RC helicopter flight

[HardlyDidHerSome]

We're not connecting.Changing the bevel and umbrella gear ratios would be a terrible task (as you stated). What I am advocating is to make the saft they rotate on spin faster. If it spins faster, the gears turn faster and so does the tail. It would be easier to make ratio changes to the gears before and after the safter than it would to modify those more specialized gears. But I will take my goofy self elsewhere and leave this to the gurus. Good luck.

[StormyMaxPerry]

@Hardly

That shaft is the mainshaft, the one the main rotor is directly tied to. Spinning the "umbrella gear" faster can only be done by spinning the main rotor faster and that's not going to happen. If I could design as you said an inline gearbox, one that could fit in the forward end of the tail boom and give me a 40% rise in RPM, that would do the job but size and strength requirements would make durability the next problem. New chassis needed actually...

[HardlyDidHerSome]

OK...been thinkin. Assuming your configuration is pulley #1 to pulley #2 to pinion gear #3 to main gear #4. Tail gears are inbetween the pulleys and gears. Make pulley #2 smaller to turn shaft faster. Allows tail to turn faster. But to keep rotor speed same, decrease size of pinion to compensate for faster shaft rpm, thus making the rotor spin at the same rpm as before. Decrease ratio #1 and Increase ratio #2. In the middle is the tail gears and they will turn faster. Am I goofy on this one?

[StormyMaxPerry]

@HardlyDidHerSome

Yup, you're "goofy" :-) The problem is you aren't familiar with the X-Cell Ion-X mechanics, or don't seem to be. The tail drive is basically a bevel gear riding on the teeth of a crown gear which is directly connected to the mainshaft. Only by making a larger crown gear or a smaller bevel gear can the ratio to the tail be raised. If this style heli were designed as you said, changing the ratios would be a snap but... THX for trying :D

[HardlyDidHerSome]

I had to deal with precision gears and clutch for telescope system once and appreciate your determination. Separates the men from the boys. Ha. May be lame but what about an intermediate gear box inline that uses comon gears and changes ratio to up rpm's? I really favor the idea of two parallel shafts up front so one can do stock umbrella but change pulleys for tail. Talk about a platform for experimentation. Your camera guy never responded to my email couple weeks back. Must be in berry field,

[StormyMaxPerry]

@HardlyDidHerSome

How did you try to contact my camera guy? Through youtube or...? He doesn't have an account here. What was the question?

[lolziloveminecraft]

Thatsssssss a nice heli you got there! it's be a ssssssssshame if anything were to happen to it!... SSSSSSSSSSSSSSSS... BOOM!!!!!! u and ur heli are gone

[mrfourtysevenman]

chop til you drop

[ht448]

finally a realistic RC heli

[HardlyDidHerSome]

OK. I got it finally. You were right. I didn;t know about the Xcell. Thought it had two parallel shafts. I'm with you...seems like you have enuff skills to do your own platform (chassis) that you can experiemnt off of. That is what I have been considering. Using HD components from others.