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e-Century Hummingbird - Swift > Carbo Fiber Hummingbird Blades
 
 
dgxco
Senior Heliman
Location: Greenville, SC

Has anyone had any luck with te CF Blades from helihobby. I installed a set on my HB with a 280 motor and the resulting performance is not very good. I seem to have very little control over the direction as well as the head speed seems to be much lower resulting in a loss of control when dropping altitude. I switched back to the stock blades and the heli controls better and climbs much faster..

Dark Angel
08-04-2003 Over year old.
 
 
flyboy
Elite Veteran
Location: California

You will need to upgrade the motor and possably the tail as well, from what I understand the CF blades needa slightly higher head speed.
Search around the forum, this has been well covered.
08-04-2003 Over year old.
 
 
jeffs555
Senior Heliman
Location: North Carolina

With a given fixed pitch blade, if the heli is hovering, and you increase head speed, the heli will climb. The people that talk about the increased head speed are using FP Hornet CF blades, which have a lower pitch and therefore require a higher head speed. Helihobby is now selling CF blades for the HB/Picolo. Though I haven't tried them, I suspect that these are just copies of plastic blades done in CF. The plastic blades are more flexible and easier to bend, so your original blades may have less pitch than they were shipped with. Also, the original blades were designed to hover with the heavy "birdseed" packs. If you drop the weight by going to much lighter LiPoly packs, the head speed at hover will go down, unless you take some pitch out of the blades. I don't think you can twist less pitch into the CF blades. There are mods to the blade mounts that let you adjust the pitch.

Jeff
08-04-2003 Over year old.
 
 
Gazoo
Veteran
Location: Maryland

I just want to say that I recently installed the Hornet CF FP blades and I love them! The heli is much more stable due to the higher head speed, and a little more responsive. I can't wait to try it outside

I can attest that everything that has been said about these blades is true. I agree that the stock CF blades for the HB are probably a copy, which is one reason I did not order them.
08-04-2003 Over year old.
 
 
MADGUNS
Senior Heliman
Location: RAF Mildenhall

Gazoo I got a question

Hey Gazoo
What type of pinion gear are you running on your bird with those blades?
08-05-2003 Over year old.
 
 
Gazoo
Veteran
Location: Maryland

I am using an 8T with the Acro 280BB motor. It works out very well
08-05-2003 Over year old.
 
 
MADGUNS
Senior Heliman
Location: RAF Mildenhall

pinion gears for hornet blades

I know allot of guys are useing 8 or 9 tooth pinions on there motors whatever they may be. Lately myself and Keyrock the unfrozen hummingbird pilot have been using a 12 tooth pinion. We both are running Orion Micro Elites. He has been using this combo about 4 weeks longer than me.Not too long ago my original Orion bit the dust partly because I bought it used from Ebay. This once again backs up my advice on not purchasing electronics used. Anyway I went back to my 370 and ran the 12 tooth and it did get prety hot. I went ahead and searched hi and low on the internet and found a brand new Orion for $36.00 from an RC car store that was switching to paintball. Sorry I got the last one. Before I installed the new orion I fabricated a heatsink for it. I used a piece of 1/8 aluminum plate. I cut a hole the same size as the motor can diameter. then I cut a larger circle out around the hole making an aluminum doughnut. After that I put the piece into my vise and cut cooling fins into the doughnut using a dremal cutoff wheel. Works out pretty well. I then cut 1/2 of the chrome decal off from the motor so that I would have metal to metal contact for proper heat disipation. Te benifit of the 12 tooth pinion is that the heli climbs like a bat out of hell compared to the lower selections. I like to get into high hovers and this pinoin seams to do the trick. The head speed of course is way higher and it seams to get itself out of trouble quicker when bombing around outside. The drawback is the added load on the motor internals. Here is the question if the motor is under allot more load and it has good airflow for cooling whats the difference? The other point is that a coreless motor developes quite a bit more torque than one of traditional design so why not make use of it?
Just throw that out there for debate.
08-05-2003 Over year old.
 
 
Gazoo
Veteran
Location: Maryland

I had the same Orion motor and it lost power similar to what happens to a lot of people with the stock motor. I did not have a heat sink for it, but once it died I decided to go with the Acro since the brushes can be replaced, and it does not get at all hot using the 8T pinion. The Orion uses wipers instead of brushes and should be run on a frequency higher than the HB produces.

I did get the heat sink from Century for the HP Motor, and it fits the Acro like a glove. When I get it outside I may find that I need a 9 or 10T. But for now I am happy.

I think you hit the nail on the head though. As long as one can keep the motor cool, it should not matter which pinion one uses Heat is what kills the motors more than anything else.
08-05-2003 Over year old.
 
 
bradraptor30
Senior Heliman
Location: SOUTH CAROLINA

i was trying to decide to switch or not that posts answeres my questions
08-05-2003 Over year old.
 
 
stevem
Senior Heliman
Location: Oklahoma

Different motors will require different pinions to get them to operate within their proper range. If you use too large of a pinion, sure you pull more current, but if the motor is operating outside of it's peak efficiency range, all you make is heat and can actually produce less power to the main rotor. This is why the Orion works best with a larger pinion than the 280BB.

Both are good motors - the Orion Elite (a coreless motor) will have a peak efficiency that is higher than the 280BB, but it is really about a 25 watt motor - so you are using it near it's peak in the hummingbird. You should also use a high frequency ESC with a coreless motor like the Orion Elite otherwise plan on a short life compared to a 'traditional' brushed motor.

Just keep in mind that the heat the motor gives off is a sign of inefficiency. If the motor is 100% efficient, then all the power going in is turned into work for the rotor. As this efficiency drops, the power lost for work is given up as heat. So for those motors getting realyl hot, you may be wasting more power than you are using (less than 50% efficiency).

I know - more mumbo-jumbo to clog the mind.

Steve
08-05-2003 Over year old.
 
 
MADGUNS
Senior Heliman
Location: RAF Mildenhall

You are correct

I leaned early on that anything that produces mechanical power generates heat. The less heat generated means the motor whatever it maybe is running effieciantly.
08-05-2003 Over year old.
 
 
MADGUNS
Senior Heliman
Location: RAF Mildenhall

Unfourtunatly I never learned how to spell
08-05-2003 Over year old.
 
 
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e-Century Hummingbird - Swift > Carbo Fiber Hummingbird Blades
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