500 Size scale questions

[Streetluge Chris]

Iam going to put my 500 in a bo 105 but I have lots of questions.
The plan is to put the copterx 4 blade 500 size head on but I have no idea what effect this will have like .
What size blades do I need scale blades? Bigger lipo? What's phasing?
Do you get more lift with 4 blades ? Use more power or less.
The head says you don't need stabilization has any one used one.
What other things will have to do?
Thanks

[macca221]

i have been flying scale electrics for a while and have found no real problems however you will loose flight time I use scale blades for all my models see smart models hk they have a good range for all sizes of helicopter most heads can be electronicly phased which isnt a big deal i always fly my birds pod and boom standard head to sort first then change to multi blade head and fly to tune before installing in fues also be sure that if fues has any upper windows that they are fited with windows as these upper windows such as found on hughs 500 fues have a drastic efect on airflow if left open also i have never had to use any electronic stabilisation other than a gyro just remember to limit blade angles as we are not trying to fly 3d so want smooth controls not extreme as in 3 d

[Cuppa]

I do run a 3G system on my sportsmoto 4bld head 500 trex AH64 Apache soon to be
Beast X also putting a beasty on my 50scale HIND on Trex
600e.
In my view to wear a kilt with no pants, risky! i prefer the
things i value to be well secure!

[antsis]

If you use a head like this one from Sportsmoto, you don't really need to worry about phasing as this is incorporated in the design.

model helicopter 4 blade scale cnc alloy heads for 500 and 600 helicopters sportsmoto

However, multiblade heads are a lot more responsive and if you're not used to them, you can get into trouble very quickly. Therefore putting some type of stabilisation is a good idea.

With regards to blades, I am using 530mm blades on my MD500/Trex 600e. This is equivalent to 120% more blade area. This is mainly due to the blades having the same chordwise measurements. Scale blades may be the same length as your conventional ones, but the chord is generally less.

[Spannaz]

well, have you got the scale body yet? If not i maybe able to help you out there!

[rexflyer]

hi all ime doing the same i would like an ec145 scale trex 500. what does phasing mean exactly ime not familliar with all these terms people use. but willing to listen and learn a few things

[Streetluge Chris]

I have the fuse I was going to put the skya 500 I have in it but think will get another kit for frame. One of the lads in the club it testing out the copterx four blade head and its looking good so far.He has a build thread on heli guy.

[Streetluge Chris]

YouTube - HR FEN TEST 4 BLADE HEAD

[Cuppa]

Phazing on x4 blades means frd/aft/port/stbd blades are in line with the
aircraft as on top swashplate on x5 blade the top plate will have x6 balls
one for locking the top plate off (phazing) looking at the top plate the
ball hook'd up to the locker should be just left or right of the TOP
swashplate ele ball link, and the ball TOP NEXT to this sould line up ele ball BOTTOM swashplate then blade fwd/aft is number '1' on the hub.
all blades are pitchd at this point in rotition 1,2,3,ect as the swahplate
rolls blade pitches follow this point in rotation.
that made my brain ache! to much paperwork!

[rexflyer]

thank you very much for that info

[antsis]

Phasing on a multiblade head is done to aviod interaction between aileron and elevator. On a conventional 2 blade head, the link rods are 90 degrees to the blade, so if the blade is over the boom and an elevator input is actioned the blade does not move. The link rod is effectively sitting parallel to the centre of the swashplate.

However with a multiblade setup, the links are no longer at 90 degrees which means that when the blade is over the boom, it will move during an elevator input. Therefore if you did not set the phasing, when you input elevator, the model would start to roll as well.

Setting the phasing can be done mechanically by twisting the swashplate. Unfortunately as the number of blades increase, this method results in link rods at almost 45 degrees which looks strange and also could case control issues. The heads from Sportsmoto have got past this by incorporating a shaped link rod.

Most stabilisation systems mix out the phasing electronically.

[Aidi]

Easiest way to make sure you have correct phasing on multiblade head...

At 0 pitch, put any one of the blades parrallel to the tailboom. Then, move the swash driver until the blade over the tail boom is at 0 pitch, and remains at 0 when ele/ali inputs are moved. It works, i have tested it. I didnt have any electronic stabilizatoin on my 5 bladed head... it flew, but was hard work!

The downside to that, is the linkage from the head to the swash will not be vertical, thus leads to undue strain on the links when inputs are introduced... Not significant, but enough.

Best option would be to use a stabalization system which allows electronic phasing. This will then let you set the head mechanics so the links from swash to blades are vertical, and the phasing then set using electronics. Again, same process by putting one of the blades parallel to the tail boom and setting 0 pitch and no interaction when inputting ele/ali controls

Hope that is simple enough to follow

[dannyhough]

Hi

Easiest way to mechanically set pahasing on multi blade head regardless of blade number......

[ame="http://www.youtube.com/watch?v=mPINNY8_Kdc"]YouTube - RC Helicopter Multi blade phasing, HOW TO![/ame]

Sorry about the quality, i don't profess to be a presenter or camera man

Here's an earlier one i did for 5 blade head, same principle applies....

[ame=http://www.youtube.com/watch?v=bmBvnBPC8PY&NR=1]YouTube - CX 5 BLADE PHASING[/ame]

and just to prove it works here it is with align 3G for the FBL control...

[ame=http://www.youtube.com/watch?v=htOof8CWj_U]YouTube - MD500E FFF.AVI[/ame]

Hope all this helps someone, when you get round to it Chris we'll get together and sort it

[Cuppa]

Very cool Dan can't wait to get my 600e HIND up now i
have seen your baby exelent
i have exact same body watch out for air presure build up in the body
in fast forward flight it can pop the nose off! i cut an extra vent
opening and used a bit of spray painted net curten as mesh works
a treat mate
my MB bodys up for grabs

[trillian]

Recently I ran across this company; RC Aerodyne | ScaleFlying.com - Multi-Blade Rotor Heads

They claim on some of their 4 blade heads that electronic stabilization is not required. I was hoping perhaps they were making something like the cleverly designed 4 blade head I have seen whereby two of the blades act like a flybar (I think maybe JR made it?) but this does not seem to be the case with the RcAerodyne heads so I don't know why they claim some don't need stabilization.

I emailed them to ask about this and they said the 4 blade heads running scale style flexible plastic blades won't need stabilization. But I'm pretty sure somewhere on their website they talk about running regular carbon or GRP blades.