World Models Ultimate 40
 

:D:D After 15 flights, plus two by our clubs top pilots, I cannot speak highly enough of this little bullet! With an OS46FX, 11X6APC, she has almost unlimited vertical, snaps and spins quickly, had authoritative rolls, and lands like a ***** cat-- no tenedncy to snap or stall with just a little speed. It is also strongly built. I honestly dont know what more fun you could have for 149.00.
One caution-- this is a little plane-- keep it close in or you cant tell where it is or what it is doing!. It is not designed to be a 3D flyer, but does all the normal stuff beautifully!

RE: World Models Ultimate 40
 

what does she weigh i am glad you are loving life..

RE: World Models Ultimate 40
 

Could someone possibly explain and maybe take a picture
of the cabane struts assembly. I am at a complete loss as
to what goes where. I have the same kit and the same instrunctions.

I have slightly modified mine by removing the single servo for the ailerons.
I made small servos on the bottom of the lower wing.

Is everybody doing the same assembly for the joining wires
to connect the lower airleron to the upper aireron.

Looks like a lot of different parts to me.

As for the linkage connecting the lower to the upper ailerons,
what is the ideal place for the horns?
I want to have each aileron move the same distance.

RE: World Models Ultimate 40
 

It weighs just under 5 po.unds

RE: World Models Ultimate 40
 

Sorry, I dodnt have a digital camera. I assembled mine just like the imstructions called for. Get one of your club memebers to help ou before you mess it up.

RE: World Models Ultimate 40
 

I guess I need a picture more than a Thousand words.

RE: World Models Ultimate 40
 

av8r4aa,
The aileron connection hardware and resulting setup for the WM Ultimate 40 does not result in equal moving ailerons.

They provide average, everyday control horns that have been chopped short. The idea to chop them short is moving in the right direction, but not by much. They place them "facing each other" and that makes things a little worse, it's a step in the wrong direction.

The best connection for ailerons that're connected top to bottom, like in this model, would be to have the connection points in line with the aileron hinge lines, and with each other. The basic law of rc pushrods is that the pushrod connection makes a right angle with the servo arm or with the surface hinge axis. If you look at the way this ultimate is setup, there isn't anything close to a right angle anywhere. The way the ARF is setup, when you give the model full aileron command with your tx stick, one side's ailerons will move almost equally while the other side's will be pretty screwed. Say you give the model a right aileron command. The right ailerons will move with the upper one moving about 10% less than the lower. Not too bad. But the left upper aileron is only going to move down half what the lower is going to move. Some aircraft have differential aileron setups. This setup actually results in something opposite of what results with conventional differential aileron.

If you draw a line from the aileron hinge axis to the connection point for the top wing and then for the bottom wing that'd be two lines right. And then draw a line connecting the two connection points. Those three lines ought to have two right angles. The setup design gives you one fairly sharp acute angle and one somewhat open obtuse angle.

For a rod connector to drive both ailerons the same distance on this model, the connect point for the top aileron would be just aft the TE and about 3/8" above the TE. And the same location for the lower aileron's connect point.

I was pretty sure that I started a thread about this model and this problem, but I can't find it. Think it had a picture in it. I'll go look for the original of the picture.

RE: World Models Ultimate 40
 

Here is a picture I just whipped up to show the WM setup and it's results when the connected ailerons are driven down.

RE: World Models Ultimate 40
 

One simple solution is to have the connect points be in the same place for both the top and bottom aileron.

Let's put the connect point slap on the TE for all the ailerons. If there is no stagger, then that solution works out perfectly to move the driven aileron exactly the same deflection as the driving aileron moves. The reason there is equal movement is because the connect points are square to each other and their hinge axis.

If you draw a line from the TE of the top aileron to the TE of the bottom aileron on the Ultimate, that line is off square by about 9-10 degrees. If you want the top aileron connection to be square, the connection will have to go above the top aileron about 10 degrees or about a quarter inch above the TE. And the bottom aileron would have it's connection about that far above it's TE.

RE: World Models Ultimate 40
 

BTW, you also asked about the ideal location for the horns.

On the WM design (with just the one servo driving torque rods that extend into the aileron balsa wood) the best place would be right over where the torque rods extend out into the aileron's balsa wood. That way the driving force from the servo has the least balsa wood between it and the connector system.

RE: World Models Ultimate 40
 

WOW,
NOW THATS A ANSWER!

RE: World Models Ultimate 40
 

On my airplane I removed the torque rods.
I used some flush mounting servo covers on the bottom
of the lower wing. I think I will tap off the lower aileron
to the upper aileron. I guess that if all angles are at 90 degrees
then the ailerons should be proportional.

DAROCK you are DA-MAN

RE: World Models Ultimate 40
 

Here's a thread I started in the 3D Forum.

I put 4 aileron servos in it. I also put 2 elevator servos in it.

Tower Hobbies .75 engine.

Totally ballistic vertical.

Weighs 5.25 pounds.

Not the best at 3D. Mine will hover and pull out.


http://www.rcuniverse.com/forum/m_34...tm.htm#3523800

Read it. I gave detailed descriptions on how to modify it for 4 ailerons servos. Lots of pics in there.

RE: World Models Ultimate 40
 

Finished pics with the Hitec HS-225 servos in the tail.