Belt-CP V2 + TW-742 models anyone?

[diasje]

[hillbillyheli]

I to need a belt cp v2 model for the sim. I have got one from another site but it just stays in a looped crash and will not stop. Any info on a cp model would be great.

[TreeHugger]

Not a Belt CP, but several similar (and nice) models can be found here:


Regards

[dmitrynizh]

Hi diasje,

I built FMS 2.8 model for TW-742. I have the stock variant as well as upgraded/modded variants. The models files need some 'polishing' work before I can upload them, though....

Dmitry

[aesmith]

Hi, I'm learning on a TW-742 as well, so I'd be interested in your FMS model - even in its unpolished state!

Cheers, TonyS

[dmitrynizh]

Hi TonyS,

I'll finish the stock version this weekend and post a link.

[aesmith]

That would be really good, thanks.

[dmitrynizh]

Please find two TW-742 FMS models in the links below. The first one is for stock TW742, the second one is my latest mod. Refer to the notes in the zip archives and in the INFO sections of the par files for details.

Stock TW-742:

My brushless RGY mod:

I'll upload these to rc-sim.de soon, but my site will always have the latest versions.

You can also check my TW742 page describing some of my mods:

-Dmitry

[aesmith]

Wow that's brilliant. It flies like mine, same slight tendency to drop the nose in a banked turn and to pop up when levelling off. Thanks a million.

[dmitrynizh]

Hi TonyS,

glad you found that my model matches your real-life plane. I put considerable efforts in the par file.

My TW-742 page, will soon contain a link to a FMS model video next to a link to real TW742 video demonstrating that the model flies pretty close to the real plane.

Of course, a lot depends on CG location, which on the real TW742 can be adjuster with battery. On my FMS model CG is almost 40% of the root chord - more aft than what the stock setup implies, yet I fly my RGY TW742 with even more aft CG.

If/when you decide to upgrade/improve your TW742, consider the aileron linkage and brushless mods I describe on my webpage - the result flies just like my TW742_RGY model. The TW742 thread on rcgroups discusses several similar mods.

[aesmith]

Thanks again Dmitry, I'm having a lot of fun with the model in FMS while its too windy outside. I'm going to make your aileron modifications soon, I wish I'd read your web page before ordering two SG90 9g servos. How did you fit the servos in the wing? Are they glued in place or just held in with tape? Tony S

[dmitrynizh]

You can use 9g there just fine, but they are a bit overkill as 5g have proven to be perfectly enough for TW742's ailerons. I glued mine in, and then covered with tape: , but if you cut EPS carefully so that the servos fit snag, then tape is enough, especially if you cover the walls of each servo "bay" with fibertape (let fibers be aligned horizontally, this will reinforce the walls) and then cover each servo with fibertape as well. I use this on all my 10-20oz foam planes including zagi-like delta wings.

To cut clean servo bays, make a template and then cut many, not just two, parallel cuts with a sharp X-acto blade and then again at 90 degrees. Have a mark or a piece of tape on your blade to control the depth of each cut. After that, you will get very clean and snag bay with flat bottom. Another method is to use a hot wire cutter to carve out the bay (more advanced).

You also might consider running a few lines of fibertape alone both sides of the wing and also covering the whole wing with 2mil packing tape as I did. You can skip this, it is not at all required, but if you do, it will be much stronger with a weight increase which is less than what many expect from 2mil tape.

[aesmith]

Thanks again. When I convert to two aileron servos, I'll go with the 5g servos. Not just to save a couple of grams, but also so the holes in the wing are as small as possible