Register Now

flint723 · 12-12-2012, 09:09 PM

(are you guys tired of my "ideas" yet?)

I was looking at my swash driver arms on my low fbl head and I noticed that they are not horizontal when the swash is at 0 pitch. I was trying to figure out if there was a reason, and the only thing I could come up with was that possibly because the arms are sort of too long when used on the low fbl head, and maybe they were trying to bring the the swash followers more level.

So what I was thinking is why couldn't I just cut 5mm or so off the main shaft, re drill the hole (providing I can, I have the hollow main shaft which I think is hardened), and lower the head another 5mm to get the swash driver arm to sit level at 0 pitch. Right now they sit level at max pitch (12 degrees). There would still be plenty of room for the swash to move, I checked that. And I realize it would be difficult to get the hole drilled in the perfect spot, but I think I have the right equipment and know how to do it.

So I was curious if other people's swash driver arms sit like that, or if it is just mine. I tried google images for low fbl head protos's but there was like nothing. Here's what mine looks like at -12, 0, and +12.

scott s · 12-12-2012, 09:16 PM

They are just swash drivers, not mixing arms as in a flybar head. They don't have to be parallel at midstick for any reason at all. In a flybar head they would have linkages attached and therefore need to be parallel at midstick for proper geometry. Leave well enogh alone LOL! and I sure as hell would not lower the main shaft any more that is for sure! Both the protos low fbl head and mini protos low fbl head are like this as is the rjx 450 fbl head and many others. Again they are just swash drivers and nothing more.

Dr. M · 12-12-2012, 09:20 PM

I think you need to stop with the random tinkering and go fly. That's what this toy is designed to do, after all.

flint723 · 12-12-2012, 09:35 PM

Well I did fly today, but here in ND the weather has been making it difficult. Today was the first nice day in a while where nice means not really windy, not snowing, and temp above 25. So I get bored on all the other days...

alexf1852 · 12-12-2012, 09:36 PM

Lowering the head any more than what you have with the low hub could result in a boom strike. +1 to what others have already said. No need to have them level.

pani · 12-13-2012, 01:04 AM

Your swash is riding too low. At -12 if you give cyclic input it will bind on the frame. Lengthen the servo to swash links. My servo to swash is 31mm and swash to grips 28mm (inside length). 12degrees collective and 12 cyclic with no binding at all at step L of beastx menu.

flint723 · 12-13-2012, 09:40 AM

@ alex, You were right, I found out that the trex 550 dfc has about 125mm of blade to boom clearance which is also what I have. So I will not be cutting my shaft any shorter.

@ pani, I don't have swash binding actually but I am not running 12 degrees cyclic either. I still will raise the swash though.

12-12-2012, 09:09 PM	#1 (permalink)
flint723 Registered Users Join Date: Nov 2012	So, I had another idea (are you guys tired of my "ideas" yet?) I was looking at my swash driver arms on my low fbl head and I noticed that they are not horizontal when the swash is at 0 pitch. I was trying to figure out if there was a reason, and the only thing I could come up with was that possibly because the arms are sort of too long when used on the low fbl head, and maybe they were trying to bring the the swash followers more level. So what I was thinking is why couldn't I just cut 5mm or so off the main shaft, re drill the hole (providing I can, I have the hollow main shaft which I think is hardened), and lower the head another 5mm to get the swash driver arm to sit level at 0 pitch. Right now they sit level at max pitch (12 degrees). There would still be plenty of room for the swash to move, I checked that. And I realize it would be difficult to get the hole drilled in the perfect spot, but I think I have the right equipment and know how to do it. So I was curious if other people's swash driver arms sit like that, or if it is just mine. I tried google images for low fbl head protos's but there was like nothing. Here's what mine looks like at -12, 0, and +12. Attached Thumbnails

12-12-2012, 09:20 PM	#3 (permalink)
Dr. M Registered Users My HF Map location Join Date: Jun 2011	I think you need to stop with the random tinkering and go fly. That's what this toy is designed to do, after all. __________________ CopterX 450 Black Angel FBL "Night Rig" \| ZYX v4.0 PRÔTOS 500 FBL "Sky Whip" \| Robird G31 Audacity P6 FBL "Phoenix" \| MSH Brain \| 12s Goblin Speed \| iKon

12-12-2012, 09:36 PM	#5 (permalink)
alexf1852 Registered Users My HF Map location Join Date: Dec 2009	Lowering the head any more than what you have with the low hub could result in a boom strike. +1 to what others have already said. No need to have them level. __________________ MSH Protos 500, SAB 630

12-13-2012, 01:04 AM	#6 (permalink)
pani Registered Users Join Date: Mar 2007	Your swash is riding too low. At -12 if you give cyclic input it will bind on the frame. Lengthen the servo to swash links. My servo to swash is 31mm and swash to grips 28mm (inside length). 12degrees collective and 12 cyclic with no binding at all at step L of beastx menu. Attached Thumbnails

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

12-12-2012, 09:16 PM	#2 (permalink)
scott s Registered Users Join Date: Apr 2010	They are just swash drivers, not mixing arms as in a flybar head. They don't have to be parallel at midstick for any reason at all. In a flybar head they would have linkages attached and therefore need to be parallel at midstick for proper geometry. Leave well enogh alone LOL! and I sure as hell would not lower the main shaft any more that is for sure! Both the protos low fbl head and mini protos low fbl head are like this as is the rjx 450 fbl head and many others. Again they are just swash drivers and nothing more.

12-12-2012, 09:35 PM	#4 (permalink)
flint723 Registered Users Thread Starter Join Date: Nov 2012	Well I did fly today, but here in ND the weather has been making it difficult. Today was the first nice day in a while where nice means not really windy, not snowing, and temp above 25. So I get bored on all the other days...

12-13-2012, 09:40 AM	#7 (permalink)
flint723 Registered Users Thread Starter Join Date: Nov 2012	@ alex, You were right, I found out that the trex 550 dfc has about 125mm of blade to boom clearance which is also what I have. So I will not be cutting my shaft any shorter. @ pani, I don't have swash binding actually but I am not running 12 degrees cyclic either. I still will raise the swash though.

Register Now

Log-in