450 Rooivalk project

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Theuns v V
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Re: 450 Rooivalk project

Unread postby Theuns v V » Fri Nov 27, 2015 10:20 am

F3P flyer wrote:Oh now I see, see how well PVA works !!!!!


Designed for poepolle like me :lol:
Plug has now been pollished again and PVA'ed. I must remember to put the gellcoat on this time!
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Re: 450 Rooivalk project

Unread postby Theuns v V » Fri Nov 27, 2015 6:32 pm

I completed the mold, now just wait for it to cure so I can see if it was successfull or not 8-[
This time I remembered the celcoat on the other side.
Hopefully I can get the firs fuse out of the molds by monday so I can complete the rest of the tooling.

T
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Re: 450 Rooivalk project

Unread postby Theuns v V » Sat Nov 28, 2015 8:05 am

Here is the completed mold halves.
Strangely the release PVA stained the gellcoat on the one, maybe it was still not fully cured but as the Zohan would say, it is "silky smooth" :wink:

I hope to do the prototype fuselage tomorrow.

The plug came out with some difficulty due to the sharp angles and large flat surfases but it is 98% undamaged, just scratched the paint on the boom so I am fairly happy with that.

T
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Re: 450 Rooivalk project

Unread postby Tomcat1 » Sat Nov 28, 2015 8:40 am

Looking GOOD Theuns =D> =D> =D>
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Re: 450 Rooivalk project

Unread postby Theuns v V » Sat Nov 28, 2015 11:02 am

On clkose inspection I see the gellcoat has failed on the side and bottom of the left hanbd side fuse's ammo box :(
Instead of trying to get gellcoat in there again I will just cut out that section of the mold , put it back on the plug and re-do that part again from scratch.

T
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Re: 450 Rooivalk project

Unread postby Theuns v V » Sun Nov 29, 2015 8:50 am

Here was thde affected area. Fixing the jellcoat in the confined space to good enough standards would be difficult so I just cut it out and filled the area with a mix of epoxy and flox. Then layed some 163 cloth over the outside to keep it inplace.
Hopefully the first fuse will go into the molds today....stay tuned.

T
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Re: 450 Rooivalk project

Unread postby Theuns v V » Sun Nov 29, 2015 2:03 pm

I got the first layups in the molds and I was rather surprised how difficult it was to form. There are allot of sharp corners and thngs sticking out.
I will have to refine the layup method a little better of come up with a silicone plug that will press it into the corners while it cures.

T
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Re: 450 Rooivalk project

Unread postby Theuns v V » Sun Nov 29, 2015 7:59 pm

I am glad to report the first one is out the molds and it is a viable tooling prototype :)
Now to see how to fit the mechanics :? :?
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Re: 450 Rooivalk project

Unread postby Theuns v V » Mon Nov 30, 2015 11:15 am

well I got the mechanics almost lined up. I made it so that the rear right hand side of the tail post can come off for access to the offset gearbox. But it looks like the tail rotor will be high enough to "cheat" and just fly it on a standard tail setup....granted not as cool but wil have to do for now.

The canopy will most likely be a single vac formed unit while the top cowl around the main mast wil have to be in 2 halves that screw together and then attach to the fuse.

The fit inside the fise if very tight, only about 2mm each side of the main gear 8-[ I might have to drop it into the area where the pylons mound for some extra space.

T
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Re: 450 Rooivalk project

Unread postby Tomcat1 » Mon Nov 30, 2015 2:03 pm

Looks good Theuns =D> =D> =D> ...but it HAS to have the off set tail rotor #-o 8)
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Re: 450 Rooivalk project

Unread postby Theuns v V » Mon Nov 30, 2015 2:32 pm

if one could be found yes :?
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Re: 450 Rooivalk project

Unread postby bOrN2pwn » Tue Jan 12, 2016 2:55 pm

Update!
Raptor 50 SE
Thunder Tiger Mini Titan E325
Align T-Rex 500
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Re: 450 Rooivalk project

Unread postby Theuns v V » Tue Jan 12, 2016 3:04 pm

none! :lol:
Was moving house and need to get the workshop sorted.
I have also decided that the next ones will have to be vack formed into the mold as the tooling prototipe did not for very well into te tight curves.
Hoping to get into making better ones next month early.

In the meantime I went to BMG and they can make those tail belt for the longer offset, but I will have to see what the casts are going to be, maybe if we order a few the unit price will come down a little.

T
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Re: 450 Rooivalk project

Unread postby Theuns v V » Mon Feb 29, 2016 4:18 pm

It has been bugging me allot that this projec has bogged down due to the difficult fit of the machanics into the very tight fuselage.
One will basically have to strip off the tail boom from the mainframe, the tailrotor box from the boom anbd then rebuild the whole thing inside the fuse with very little space..... :(

So I thought of the following, I will mold it as it is (left and right halves) but instead of joining them in the centre with glass/epoxy I will make joiners so that they can screw the halves together around the fully assembled mechanics.....clever yes?? :lol:

T
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Re: 450 Rooivalk project

Unread postby Peter Connan » Tue Mar 01, 2016 4:48 pm

Theuns, why not put a couple of blocks on the tail boom with tapped holes both sides, and thus bolt the fuze directly to the tail boom?
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