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Hanger 9 Inverza 62

More a piece together rather than build!

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Adrian Smith 117/02/2015 17:17:00
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2151 forum posts
835 photos

Last job for the day is to make a place to fit the fuelled valve in a convenient place. My usual method where options are limited is to drill out a piece of light ply for the valve to fit in and give it support, and then cut the ply to size to fit in between two stringers in this case. And the ply glued in with epoxy.

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Adrian Smith 122/02/2015 18:03:10
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2151 forum posts
835 photos

Managed to fit the throttle and choke servos combined with the pushrods. With both the OS 33 and 60 GT the instructions suggest a manual push/pull rod to operate the choke, but as I don't like sticking my digits across the propeller line no matter what the reason I always use a servo within the fuz and operated by the TX.

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Adrian Smith 122/02/2015 18:07:13
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2151 forum posts
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Given that the nuts in the firewall are almost impossible, as can be seen, to tighten up in the future with this setup I am thinking of cutting some slots in the top of the firebox to allow a socket set to be inserted and therefore make this job easier for maintenance purposes.

p1020186.jpgShouldn't be too difficult with a dremel or something similar. Will try that this week some time as the weather is meant to be rubbish for flying.

Adrian Smith 124/02/2015 17:01:54
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2151 forum posts
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Got to work with my mini jig saw and cut out two slots. While I was at it I did a bit of reinforcing to the firebox with some triangular stock a some light ply.

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Adrian Smith 124/02/2015 17:03:27
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2151 forum posts
835 photos

Now I can get a socket spanner easily to tighten up the standoff bolts if required and also get at the pushrods.

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Adrian Smith 124/02/2015 17:06:40
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2151 forum posts
835 photos

Next job is to do the fitted out supplied tank and fuel lines. The angled breather pipe is to long and needs shortening for it to fit in the tank correctly. Similarly I am changing the supplied clunk with a felt clunk.

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Adrian Smith 124/02/2015 17:10:07
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2151 forum posts
835 photos

Fuel lines attached to the fueller valve external inline filter and then on the the carby. Breather tube also fitted to the tank and fed out of the bottom of the fuz. The fuel pipe will need a bit of tying up and securing as will the inline filter.

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cymaz24/02/2015 17:49:11
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8490 forum posts
1161 photos

Real tidy job...superb.

Adrian Smith 124/02/2015 19:07:37
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2151 forum posts
835 photos

Thanks Cymaz. I must admit it is taking me longer than I thought and some of the work is very fiddly and demands a lot of patience! I thought at the start to do a blog on this as there is not a lot of info on the web about how to approach the build. Nevertheless the kit is very good quality and some of the mods are purely personal depending on things like canister etc. I am prepared to admit that may be I should have given some of the issues a bit more thought, but as a result I have had to adapt things as I go along.

Adrian Smith 128/02/2015 23:05:50
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2151 forum posts
835 photos

No flying for the next few days due to weather so I thought I would do some cowl carving. The good news here is that because of its size, very little cowl cutting has been required. Firstly I decided to cut the outlet using my tried and tested drilling of a series of holes and cutting out with tin snips. Then finishing with my trusty Dremel and sandpaper.

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Adrian Smith 128/02/2015 23:07:44
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2151 forum posts
835 photos

The opening for the cylinder head was accomplished in a similar fashion test fitting at various intervals.

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Adrian Smith 128/02/2015 23:09:01
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2151 forum posts
835 photos

All that remains to be done is a bit of tidying up and cleaning.

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Adrian Smith 128/02/2015 23:14:04
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2151 forum posts
835 photos

Looking inside the cowl, I might be able to get away with not cutting anymore away to accommodate the curve of the manifold pipe which will be a bonus. Furthermore I am loathe to cut any more cowl for outlet air purely because of the capacity of the pipe tunnel and the air flow which will blow down there through to the outlet where the canister exits the fuselage. I may think a bit more on that one though.

p1020196.jpgOne thing this exercise has taught me is the value of decent carving tools such as a Dremel and good quality bits.

john stones 128/02/2015 23:22:57
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10385 forum posts
1475 photos

Nice job Adrian and no sharp corners to split at on the cowlyes

John

cymaz01/03/2015 08:15:01
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8490 forum posts
1161 photos

It wouldn't hurt to baffle most of the cowl opening..just leaving room around the engine. The air has to then pass over the cooling fins. .light balsa wood should be enough.

What could happen at the moment is that the air will move through the cowl, but not around the fins. And a pocket of stationary air could sit inside stopping air flow. As the air inside the cowl heats up it , of course expands, acting like a pillow, bunging everything up.

hope this helps...here is a bit more on what people have done.

Great build, lovely to see.yes

Adrian Smith 101/03/2015 09:46:36
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2151 forum posts
835 photos

Thanks John for the encouragement. Cymaz your comments are interesting as what I know about airflow in cowls you could write on the back of a fag packet. The link showing somebody else's efforts seems to me to be a quite elaborate using the balsa baffles. I must admit I would like to examine the science of it a bit first. The only other set up I have similar to this is on my Weston Capiche 140 that has an OS 160FX glow on the front with a Weston quiet mini pipe and header utilising the pipe tunnel. The cowl is quite big and the airflow cut outs are not too dissimilar to the Inverza's with no overheating issues. I know petrol engines run hotter so I'll have to see. The one observation about the the Capiche design which is brilliant is that there is an underside canister cover with cutouts that is screwed into the fuz making the fitting of a canister dead easy. NOT like the job I had to do in the Inverza. A few ARTF designers could take that on board and make life easier for all of us. It would take much to adapt the design at manufacture to produce this effect. Anyway before I go off on another tangent, that subject is for another day.

cymaz01/03/2015 10:00:47
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8490 forum posts
1161 photos

I am a total convert to baffles...they really do make a difference. What could be worse than, for the sake of a bit of balsa, to have a nice shiny artf down in bits because of an overly hot engine that gave up.

I have baffles in several planes. The rule of thumb is 2/3x air exit to 1x inlet, to accommodate the increase in volume of hot air.

link This goes into some more detail. Page 40 of the manual

Do a post to see how it goesyes

Adrian Smith 101/03/2015 20:53:28
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2151 forum posts
835 photos

Good bit of info there thanks Cymaz will give it some study time and let you know what occurs.

Adrian Smith 103/03/2015 19:21:36
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2151 forum posts
835 photos

Last bit of cowl cutting completed as there was a definite pressure point where the bend in the header pipe was touching the cowl. Same methodology as before with initial shape of hole marked with a drill bit and tin snipped out and finished off with a Dremel bit and sandpaper.

p1020201.jpgAs can be seen there is an airflow through the rear outlet, side outlet and through the canister tunnel. Whether that will be enough remains to be seen. I am studying the article on baffles to see what else could be done to ensure cooling of the engine is fully catered for.

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Adrian Smith 103/03/2015 19:24:20
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2151 forum posts
835 photos

Last bit if build detail was to dress the Inverza with spats and wheels. Nothing unusual here with the wheels secured with collets and thread locker on the grub screws, additionally the two fixing bolts on the spats were blue thread locked.

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