RE: Bdavison's E-flite Blade Assembly  
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All Forums >> RC Helicopters >> Electric RC Helis >> E-Flite Helicopters >> RE: Bdavison's E-flite Blade Assembly
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RE: Bdavison's E-flite Blade Assembly - 7/5/2005 1:33:32 AM   
Nubie_1


 

Posts: 69
Joined: 8/5/2004
From: Clinton, IN, USA
Status: offline 		If the Helli is on the ground the main turns clock wise and the tail turns counter clock wise if you look from the same side the tail blades are on opposite of the tail motor. Unless this is a trick question and as i have already stated I'm new to this not so new to the point i belong to a RC club and the AMA to help me learn.

Chris

(in reply to awdtsi)
       Post #: 26

RE: Bdavison's E-flite Blade Assembly - 7/5/2005 4:38:27 PM   
bdavison


 

Posts: 3350
Joined: 8/23/2004
From: Warner Robins, GA, USA
Status: offline 		Correct.

Main rotor rotates Clockwise.
Tail rotor rotates Counterclockwise.

Can anyone tell me why it's important for the tail rotor to rotate counterclockwise?


Also, I wouldnt say the frame is weak at the tail boom joint. Ive smacked mine in quite a few times, and never had a problem with that area. My guess is your experience might have just been "the wrong hit at the wrong place" kind of thing.

< Message edited by bdavison -- 7/5/2005 4:43:44 PM >

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       Post #: 27

RE: Bdavison's E-flite Blade Assembly - 7/5/2005 8:29:06 PM   
Nubie_1


 

Posts: 69
Joined: 8/5/2004
From: Clinton, IN, USA
Status: offline 		Umm Im out of my league here probably but I'm guessing it has to do with the main rotor wash coming off the Helli if it turned clockwise it would be fighting the flow of air instead of just using the air to help control the Helli but that would be a guess and my best guess at that.

Chris

(in reply to bdavison)
       Post #: 28

RE: Bdavison's E-flite Blade Assembly - 7/5/2005 10:56:23 PM   
bdavison


 

Posts: 3350
Joined: 8/23/2004
From: Warner Robins, GA, USA
Status: offline 		Well, here is why they rotate counterclockwise on the Blade.

Tailrotors should always rotate in the opposite direction of the main rotor head. The reason for this is that tail motors generate torque just like a main rotor head does.

If you have both the main rotor head and tail rotor spinning in the same direction, the torque generated by the tail rotor will cause the helicopter to roll.

So, we make them "counter-rotate". This counter-rotation prevents the heli from rolling over.

In some real helis, like big helis with LARGE rotors, the torque produced by the main rotor head is so high, that the tail rotor is actually "canted" to one side to counter act the heavy torque.





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       Post #: 29

RE: Bdavison's E-flite Blade Assembly - 7/5/2005 11:25:47 PM   
liteglow


 

Posts: 70
Joined: 5/26/2005
From: Mo i rana, NORWAY
Status: offline 		I wonder how much pressure there is on the tail on a real big heli !
Like how much power the tail is pressing..

(in reply to bdavison)
       Post #: 30

RE: Bdavison's E-flite Blade Assembly - 7/6/2005 12:36:29 AM   
bdavison


 

Posts: 3350
Joined: 8/23/2004
From: Warner Robins, GA, USA
Status: offline 		The UH-60 Blackhawk like in the movie "Blackhawk Down" has about 50,000 ft. lbs. of torque if I remember correctly. So the tail rotor has to be able to produce enough thrust to counteract that torque.


The torque is SO much on a blackhawk, that if the tail rotor shut down...the torque of the main rotor blade is so much that it would yank the tail around so fast it would snap the tail boom completely off.

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       Post #: 31

RE: Bdavison's E-flite Blade Assembly - 7/6/2005 12:50:10 AM   
Nubie_1


 

Posts: 69
Joined: 8/5/2004
From: Clinton, IN, USA
Status: offline 		I do have a question on this little Helli though now i know because I'm only a few inches off the ground I'm fighting a lot of blade wash off the ground but as far the hitting the sweet spot for hovering as the battery drops slowly Ive noticed my settings seem to change like its a real sweetheart at about half battery life but full battery and low has some minute changes in setting is this normal to these little Helli's.

Thank You
Chris

(in reply to bdavison)
       Post #: 32

RE: Bdavison's E-flite Blade Assembly - 7/6/2005 2:10:36 AM   
bdavison


 

Posts: 3350
Joined: 8/23/2004
From: Warner Robins, GA, USA
Status: offline 		Yeah, the stock battery is a NiMH. They normally have a spike in power at full charge, it levels off as the battery is used, and then drops off as it dies.

Get a good lipo and this will help alleviate the problem. Id recommend a Thunderpower 3cell 1320mah. Run times are over 20min with this battery, and it works great.

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RE: Bdavison's E-flite Blade Assembly - 7/6/2005 2:44:34 AM   
thrilsekr


 

Posts: 87
Joined: 6/29/2005
From: Central Coast, CA, USA
Status: offline 		Tips for installing a new center hub and spindle set -- EFLH1145

DON'T THROW AWAY THE OLD ONE!

I am an expert at crashing, so I have logged a few hours in repairing as one could imagine.

So I had a bent main shaft. on my heli. Also the spindle was bent.

I bought the EFLH1145 (center hub and spindle) and EFLH1155 (main shaft and drive gear). I did this repair before this thread.
Anyway. To make a long story short, after spending three hours trying to figure out why my blades would not pitch well (after the rebuild). The solution to the problem was... The new rotor head did not fit right. It was too small for the center hub. It fit just fine at the top, but you will notice when you have to replace this stuff that the rotor head has some grooves that align with the center hub. When the rotor head was in its proper place (at the very bottom) the movement up and down was restricted all the way from the bottom, up to where the grooves stopped. I spent hours trying to figure out why the swashplate would not move freely on the main shaft (allowing the blades to pitch), and also looking at the spindle and blade grips to see where the restriction was before I figured it was the new center hub.
I busted out the trusty dremel tool and tried shaving the grooves on the center hub down. Did not help. I had to take it all apart again and use my old center hub with my new spindle (not sold separately) to fix the problem.

I do not know to what tolerances the parts are made, but after hours of trying different lubricants on the swash plate and shaft, and twisting the blade grips to trying to "break in the parts" (before the real problem was concluded) I had to use the old part anyway.

I don't know if this made any sense to you guys, but just something to watch out for if you buy EFLH1145. The new center hub might not fit the old rotor head properly restricting swashplate movement in turn restricting blade pitch.

thrilsekr

(in reply to bdavison)
       Post #: 34

RE: Bdavison's E-flite Blade Assembly - 7/21/2005 8:26:18 PM   
bdavison


 

Posts: 3350
Joined: 8/23/2004
From: Warner Robins, GA, USA
Status: offline 		Well guys, PART 2 of this thread is almost ready. Im just finishing up taking the last few pictures, and I hope to start posting it by Sunday afternoon. I know everyone is waiting on the head trimming and set-up section, but be patient. I put them in order for a reason.

This upcoming thread has some VERY important information in it, so its valuable information not just for the beginners.

I knew this was going to be an undertaking of mass proportion, but this is insane..kinda fun though in a way.

The new pictures are going to be better too, as Im using some slave flash units and a new background to brighten things up, and get more detail.

Keep looking its almost here.



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       Post #: 35

RE: Bdavison's E-flite Blade Assembly - 7/25/2005 12:01:13 AM   
bdavison


 

Posts: 3350
Joined: 8/23/2004
From: Warner Robins, GA, USA
Status: offline 		Part 2 - Servo installation and Avionics.

Well everyone, its time for part 2.

This section is short, mainly because its prett simple.

First take the servos and attach them to the helicopter using double sided tape as shown.

Route the servo wires underneath the servos, and then ziptie them securely.

You can go ahead and attach the servo arms, and pushrods as shown too. Dont worry about adjusting them yet, we'll get to that in a moment.


Attachments
Click to see fullsize image.
Click for fullsize


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RE: Bdavison's E-flite Blade Assembly - 7/25/2005 12:05:04 AM   
bdavison


 

Posts: 3350
Joined: 8/23/2004
From: Warner Robins, GA, USA
Status: offline 		Now its time to review the 4-in-1 box.
View the following pictures to learn where everything goes.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


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RE: Bdavison's E-flite Blade Assembly - 7/25/2005 12:09:38 AM   
bdavison


 

Posts: 3350
Joined: 8/23/2004
From: Warner Robins, GA, USA
Status: offline 		Now we are going to connect everything.

Start by attaching the 4-in-1 box to the helicopter frame using double sided tape.
Then plug in the main motor. Take note of polarity.
Next plug in the tail motor, again take note of the polarity.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


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RE: Bdavison's E-flite Blade Assembly - 7/25/2005 12:14:59 AM