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Weston Capiche 50cc Build

Weston UK Capiche 50cc with AMG-55 Engine

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Gary Manuel19/03/2018 13:27:58
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1493 forum posts
1339 photos
Posted by iqon on 19/03/2018 13:23:19:

Gary I would have given you a finger or two if you would of asked for balancing, also from previous reading etc you need 1/2 " at back of carb, personally I would leave front open and make a box inside

I had just less than 1/2". I think it might have been OK without opening it up, but it's better safe than sorry.

cymaz19/03/2018 17:38:45
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7483 forum posts
973 photos

Oh that’s thinking inside the box! laugh

Gary Manuel19/03/2018 18:55:50
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1493 forum posts
1339 photos
Posted by cymaz on 19/03/2018 17:38:45:

Oh that’s thinking inside the box! laugh

Yes - what I've basically done is add a trumpet without adding a trumpet.

Thanks for all the advice fellas - Like Frankie said, I did it "My Way" wink

Gary Manuel19/03/2018 19:31:56
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1493 forum posts
1339 photos

I've done a bit of tidying up.

Batteries perched up front after double checking CoG (with canopy and everything else in place). This gives a balance point mid-way between the recommended MIN and MAX settings. I'm expecting that I'll move the batteries further backwards later.

gwm_1475.jpg

Receiver installation. This isn't actually a receiver as it gets it's signals from from between 2 and 4 remote receivers (Satellites).

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I'm using 3 satellites. One in the X axis ....

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..... one in the Y axis ......

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..... and one in the Z axis.

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The satellite on the X axis is on a long lead and positioned behind what I expect will be the final battery position. This has been done to make sure that the batteries can never block the transmitter radio waves from reaching all three receivers.

The other little job I've done is to cut a hole in the cowl for adjusting the carbureter needle valves.....

gwm_1476.jpg

..... and fitting a grommet.

gwm_1477.jpg

Edited By Gary Manuel on 19/03/2018 19:33:49

Martin McIntosh19/03/2018 22:08:40
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2340 forum posts
928 photos

If I may digress a little I see that you say that the 922 requires satellites to work. I have a few JR921`s, some of which will operate by themselves and others only with a satellite. On speaking to McGregor they say that at least one satellite is needed. Ideas anyone because I am a bit confused? I presume that it must be a s/w change along the line somewhere.

Meticulous build by the way.

Ron Gray19/03/2018 22:40:09
769 forum posts
200 photos

@Gary - a few posts back you asked about the Walbro carb mod, well here it is **LINK**

Gary Manuel19/03/2018 22:52:26
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1493 forum posts
1339 photos

Hi Martin.

I am more familiar with 922's than 921's.

922's don't have any internal receivers at all but need at least 2 external ones (one of them in a particular socket) to enable the bind to work. The 3rd and 4th receivers are optional.

From what I understand (from their manuals), 921's and 921X's have 2 internal receivers and sockets for 2 external ones. I believe that at least 1 external receiver is needed to allow binding and the second remote is optional. If you have some that bind without an external receiver, they may be old models. It does seem strange that some work without a remote, while others need one.

Gary Manuel19/03/2018 22:59:13
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1493 forum posts
1339 photos
Posted by Ron Gray on 19/03/2018 22:40:09:

@Gary - a few posts back you asked about the Walbro carb mod, well here it is **LINK**

Thanks Ron.

Yes that's the mod I was thinking about.

The question is, how necessary is it?

I've never done it but I did get an engine (DLE111) that already had the nipple on, which I routed to the inside of the fuselage. Do other people do this mod or is it just done to fix problematic installations?

Dwain Dibley.19/03/2018 23:15:40
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907 forum posts
917 photos

I did this mod on my 26 zenoah powered edge, it stopped the deadsticks on approach to land, and the throttling problems when performing knife edge or the like. I just put the tube into the fuz, no film case.

D.D.

Peter Jenkins19/03/2018 23:33:37
978 forum posts
32 photos

My experience is with an AGM 30 and DLE 35 RA in my Capiche 140. In both cases, I just repositioned the float chamber cover so that the vent hole faced backwards. In neither case did I get any problems with the engine running erratically. Could have been pure luck of course.

Gary Manuel19/03/2018 23:48:39
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1493 forum posts
1339 photos
Posted by Dwain Dibley. on 19/03/2018 23:15:40:

I did this mod on my 26 zenoah powered edge, it stopped the deadsticks on approach to land, and the throttling problems when performing knife edge or the like. I just put the tube into the fuz, no film case.

D.D.

Interesting that it actually stopped the problems you were having Dwain. It must work then.

Is the carb rear or side mounted on the z26?

Ron Gray20/03/2018 07:39:23
769 forum posts
200 photos

It’s a small amount of work so if there’s only a slight chance it works it’s worth doing.

Gary Manuel20/03/2018 10:29:19
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1493 forum posts
1339 photos

Yes it is a small amount of work - if you have the parts and suitable taps to thread the hole.

The ones at Thunderbolrc in your link are a weird American thread.

I'll have to have a look what taps I've got and see if I can find a nipple that fits.

Ron Gray20/03/2018 11:23:09
769 forum posts
200 photos

Just get an exhaust pressure nipple, I got some a while back to add smoke to a ‘plane and they came with their own tap. I can’t remember who I got them from but it could have been JE, Nexus, RC World, I’ll have to have a root about!

Gary Manuel20/03/2018 13:46:39
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1493 forum posts
1339 photos

Thanks Ron - I've done a bit of searching and I'm pretty sure I'll be able to find a 4mm nipple and buy a suitable Taper Tap to suit. I shouldn't need a Second or Plug Tap as it's not a blind hole.

Gary Manuel20/03/2018 14:14:26
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1493 forum posts
1339 photos

My next challenge is to carefully cut THIS rather nice spinner to fit the 2 blade prop I'll be using. Not easy to do, so I'll photograph each step.

gwm_1478.jpg

Masking tape on the spinner backplate marked to define the leading and trailing edge of the prop positions on both sides.

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Piece of cardboard wrapped around the spinner ......

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..... and the bottom edge of the spinner marked.

Cardboard cut along the curved line.

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Cardboard template wrapped and taped around the spinner. The curved cut edge now aligns with the edge of the spinner.

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Shape of the propeller profile marked (by eye) onto the cardboard.

gwm_1483.jpg

Cardboard cut along the propeller profile marks.

Cardboard template, propeller and backplate assembled to check that the profile cutout is OK. This can be done as many times as necessary to get the required profile without risking over-doing it on the spinner. I'm happy with my first attempt.

gwm_1484.jpg

Masking tape added to the spinner.

gwm_1485.jpg

Leading and trailing edge marks on the back plate transferred to the spinner.

gwm_1486.jpg

Propeller profile transferred from the cardboard template to the spinner using the leading and trailing edge marks as a guide. I rotated the cardboard template and used the same profile on both sides of the spinner to ensure symmetry.

gwm_1487.jpg

Spinner now has the required cutouts.

gwm_1488.jpg

Trusty Dremel used to cut and trim the spinner. Better to under-do this than over-do it. Accuracy can be checked by trying to assemble the spinner, propeller and backplate. This needs a bit more trimming .....

gwm_1489.jpg

...... so I've drawn some new guide marks on the masking tape.

gwm_1490.jpg

Gently does it till the cutout is as required.

Happy with that.

gwm_1491.jpg

And the final test is a trial fit on the engine.gwm_1492.jpg

Edited By Gary Manuel on 20/03/2018 14:18:14

Peter Jenkins20/03/2018 14:24:54
978 forum posts
32 photos

Great technique for cutting a carbon spinner. I have only cut alloy spinners and done them by just modifying the existing cutouts. I like the process you used.

Nigel R20/03/2018 14:55:39
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1040 forum posts
251 photos

Lovely build Gary.

Martyn K20/03/2018 15:10:30
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4518 forum posts
3117 photos

Thanks for the spinner tutorial.. Very nice to know

Ron Gray20/03/2018 15:26:28
769 forum posts
200 photos

Always keep broken props, cut the blades off in approx position where a spinner would go and then use as template on new spinner. It gets you close enough for first pass then trim as necessary. Of course if you never break props you’re stuffed, I have quite a collection!

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