Topic Subscribe
WATCH  2 pages [ <<    <    ( 1 )     2     NEXT    >> ]15842 viewsPOST REPLY
HeliDirect . Heli-Max . Scorpion Power System
. .

Scale Model RC Helicopters

 >

Multibladed Tail Rotor (Cascade Type) - DIY

Super-Hornet

Veteran

Singapore

In multibladed tail rotor, there are two types of design.
1. The inline type (like Blackhawk, Seaking, Lynx)
2. The Cascading Type (like Apache and some MD-500E)

Boeing AH-64A Apache Twin two-blade teetering tail rotors mounted one above the other and set at 55/125 degrees.

Boeing AH-64A Apache Upper blades "leads" the lower blades

Westland Lynx. Notice the tail blades spin downward

Sikorsky H-60 Blackhawk / Seahawk (S-70)

Apache helicopter have its tail rotor arrange in such a way that it is 55Degree apart in order to reduce the tail rotor noise.
In MD-500E, the tail rotor arrange is such a way that it is close to 70Degree to 80Degree in order to reduce the tail noise as well.
I am uncertain about the exact degree used by MD-500E.

MD-500E with 4 bladed cascading tail rotor option.

Because of the cascading type, you will see 2 tail rotor disc when it is spinning.

12-10-2007 Over year old.
Super-Hornet

Veteran

Singapore

For R/C heli, to replicate inline type multibladed tail required to create a tail rotor hub in order to mount the tail blade grips as well as the tail rotor pitch slider in order to control each individual blade grips. For cascading type, it is much easier to replace just by using a longer tail shaft and some parts stock tail blade grips and hub.

Here is the 4 bladed cascade type of tail rotor I did on my MD-500E

The tail shaft is actually from any 3mm shaft but longer than normal TRex tail shaft. U can either use:
1. Any smaller heli with 3mm main shaft like ESky Honey Bee CP/CP2
2. Some long shaft found inside some old/unwanted CDROM/DVDROM Drive.

The aluminium pulley from TRex tail shaft is glue to the long shaft using Loctite RED color. It is recommended to use metal tail pulley instead of plastic type in order for the locktite to glue on. Using CA may not strong enough to hold it. Let it dry for 24 hours.

The blade grips and tail hub is actually from a normal TRex tail. (See below note)

The linkages rod is from normal linkages rod u find from TRex main rotor at the blade grips. The linkages use are those smaller length type.




Note:
Because MD-500E has its tail spin downward, I arrange in such a way the tail rotor is spin downward with blade grip on the leading edge controlling. The upper blades are also "leads" the lower tail blades as well. This design can also be use in Apache helicopter. In Apache, the tail rotor spin upward and upper blades "leads" the lower blades as well..so remember to change the blade grip accordingly.

SH

12-10-2007 Over year old.
Hoverup

Elite Veteran

Golden Gulf Coast - USA

Great work SH. Looks just like the cascade T/R Minature Aircraft setup on my 1/7 scale Apache AH-64A except much smaller.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

12-10-2007 Over year old.
slider46

rrProfessor

Gloversville, NY

SH very nice pictures of your tail rotor assembly. Could you do the same with your 5 blade head assembly??? I along with many others, I'm sure, would really like to see some detailed pictures...

Tom..... No "D" flying....

12-10-2007 Over year old.
kenali

Heliman

Calgary, Alberta, Canada ( but Malaysian )

Super-Hornet - Just wondering, did you paint your own tail blades or is original?


Walter

12-11-2007 Over year old.
Super-Hornet

Veteran

Singapore

Tail rotor blades is from normal Align. I just paint it white and red just like real MD-500E

Oh. I cut the tip off a bit to make it more rectangular shape (scale)...it is from my previous TRex project.

SH

12-11-2007 Over year old.
kenali

Heliman

Calgary, Alberta, Canada ( but Malaysian )

AhAaaa, I see

12-11-2007 Over year old.
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

here's my apache with that funkey tail rotor arrangement. the toughest part was finding an output shaft to house the two hubs and still have enough room to have a full pitch changing range. the slider pitch plate was made using an 6 piont futaba servo wheel with two opposing tabs removed. looks and works quite well.

drive a rotary, fly a rotorcraft

12-11-2007 Over year old.
HOMEPAGE  
Super-Hornet

Veteran

Singapore

Hi Copter Doctor

Is your tail shaft 5mm diameter? If yes, maybe next time u can check out TRex 450 or Mini Titan main shaft.

SH

12-11-2007 Over year old.
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

i think so, it is whatever the std size is on most 30 thru 90 machines are. the gearbox is from the hawk sport i just have a longer output shaft.

drive a rotary, fly a rotorcraft

12-11-2007 Over year old.
HOMEPAGE  
Super-Hornet

Veteran

Singapore

What length u looking for? I just do a quick measurement of TRex 450 shaft for you and it is around 116mm long. I do not have MT main shaft but I think it is longer.

SH

12-11-2007 Over year old.
joeb56

Senior Heliman

Newcastle,NSW - Australia

Super Hornet wrote
Note:
Because MD-500E has its tail spin downward, I arrange in such a way the tail rotor is spin downward with blade grip on the leading edge controlling. The upper blades are also "leads" the lower tail blades as well. This design can also be use in Apache helicopter. In Apache, the tail rotor spin upward and upper blades "leads" the lower blades as well..so remember to change the blade grip accordingly.

I am confused
Just been in the shed roughing out an attempt at a 4 blade tail using my Kasama tail and the TT bits I had left over to try and work out shaft lenghts,clearances etc (intend to get another Kasama blade unit soon)

Im just starting on a TT530 and I am turning the tail rotor to the other side(true scale) and believed it should still turning UP into the down wash so in this instance it will now spin clockwise (when viewed from the port side)

Which way does the full size version spin and in the end does it matter

When i get the measurements sorted for the Rapi 50 I'll add to the post
Even at this rough stage it looks really good
Cheers
Joe

12-16-2007 Over year old.
Hoverup

Elite Veteran

Golden Gulf Coast - USA

The answer to your question is in Super's first post starting this thread.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

12-16-2007 Over year old.
Super-Hornet

Veteran

Singapore

Thanks Hoverup for answering it first

joeb56... there are some heli (real) choose the tail rotor to spin upward toward the main blades why some choose to have its tail spin downward. Why they choose that way, I really not sure.
Spin downward heli are:
MD-500D/E
MQ-8 Fire Scout VTUAV
Lynx
Robinson 22
Some model of UH-1 Huey

So far I haven't seen any R/C has its tail rotor spin downward on stock configuration.

SH

12-16-2007 Over year old.
Hoverup

Elite Veteran

Golden Gulf Coast - USA

The Duzi Modell R5 Nova T/R rotates down into the main rotor arc plane. Works like a champ.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

12-16-2007 Over year old.
slider46

rrProfessor

Gloversville, NY

The first time I fliped the tail on my 500E It ended up spinning downwards and I had no problems with it that way. I had to reverse my servo and gyro direction but that was easy enough to do. It didn't seem to effect anything for sport flying. It felt funny when spooling up and down as the tail reactions are different than what I'm used too... Maybe if I was doing hard 3D it would make a difference but for a scale heli, go with what you see...

Tom..... No "D" flying....

12-16-2007 Over year old.
spiderco

Veteran

Henderson, Nevada

great post hornet, this will be useful on my next project.

12-16-2007 Over year old.
Heliguychris

Key Veteran

Perth, West Australia

Thats really cool Super, im gonna give one a go this weekend,, Cheers!!
Dont spose ya got a way of doing the bent apache tail out of trex parts??? Or is that just wishfull thinking Cheers again m8.

01-09-2008 Over year old.
HOMEPAGE  
Super-Hornet

Veteran

Singapore

U mean elevated tail using TRex parts? If yes, well, actually I did. That is how I make my elevated tail TRex.

SH

01-09-2008 Over year old.
Heliguychris

Key Veteran

Perth, West Australia

Thats the one m8, an elevated tail, out of trex parts. Dont spose ya could post a pic or two? The 4 blade tail, and 4 blade head are great for my ec135(align), and i was looking at doing an Apache next.
Any help would be warmly appreciated. Cheers , CHRIS.

01-17-2008 Over year old.
HOMEPAGE  
WATCH  2 pages [ <<    <    ( 1 )     2     NEXT    >> ]15842 viewsPOST REPLY
Ron's RC Helicopters . Thunder Power RC . Mikado
. .

Scale Model RC Helicopters

 >

Multibladed Tail Rotor (Cascade Type) - DIY

 Print TOPIC Advertisers 

Topic Subscribe

Friday, October 31 - 1:01 pm - Copyright © 2000-2014 RunRyder   EMAILEnable Cookies