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Hanger 9 Inverza 62

More a piece together rather than build!

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Adrian Smith 103/03/2015 19:30:05
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2132 forum posts
828 photos

I shall now order a PowerBox of some description to provide for single battery failure in combination with a Futaba RX that I have on the workshop shelf. These will sit to the rear of the tank on the tray provided and I will cover this in detail when I have all plus switching to hand. I will also fit a kill switch that will be operated from a switch on my Futaba TX. I will post this job on the thread later. Once that is done then I will set up the control services, linkages and throttle/choke servo combinations which I will show in detail.

Adrian Smith 101/04/2015 19:18:45
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2132 forum posts
828 photos

Now with a bit of bad weather in situ I am not fitting out the electrics in the plane. Have now taken delivery of a PowerBox Evolution plus leads and dug out a spare kill switch will be set up to operate via the A switch on my Futaba 7c using channel 5.

p1020275.jpgp1020276.jpgBefore fitting out the PowerBox I have just taken a Rx in isolation and using one battery I have centred all the servos and correctly connecting up all the working surfaces with my basic maiden flight EPAs.

Adrian Smith 101/04/2015 19:22:54
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2132 forum posts
828 photos

The connections from the RX are put into the appropriate numbered sockets at the bottom of the PowerBox using the supplied leads, while the top sockets accommodate the leads from the appropriate servos. Firstly I mounted the PowerBox switchgear and the battery warning lights into the fuz.

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Adrian Smith 101/04/2015 19:24:21
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2132 forum posts
828 photos

Next job was to mount the Ignition warning light into the fuz side near the front.

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Adrian Smith 101/04/2015 19:27:01
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2132 forum posts
828 photos

p1020283.jpgSo now to connect up the PowerBox.

p1020282.jpgThe wires look a bit messy at the moment despite tying them up, bit the final tidy up will come when I establish where the batteries will go taking account of the CoG.

Adrian Smith 101/04/2015 19:28:00
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2132 forum posts
828 photos

The kill switch sits at the front like so.

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Adrian Smith 101/04/2015 19:35:43
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2132 forum posts
828 photos

What I am doing, as I have done with my other gassers is to run the kill switch directly to the RX avoiding the PowerBox purely because the switch has a separate power source and if the battery fails the worst that can happen is the engine stops and then I can practise my dead stick skills! Furthermore, as the Evolution only has 6 channels I have wired the choke servo directly to the RX avoiding the PowerBox. The choke uses CH7 on the RX and I have assigned it switch B on the TX. The thinking is the only time I use the choke is before take off.

I have at last taken delivery of some Nord Lock washers from Model Fixings and I am using them on the manifold bolts into the OS 60GT. hopefully that will avoid the "hippy hippy" shakes. We will see, however.

p1020277.jpgHopefully later this week I will balance to CoG and therefore find a more permanent position for the batteries.

john stones 101/04/2015 19:55:47
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10181 forum posts
1475 photos

Nearly there Adrian, looking forward to the video of your maiden, great looking modelyes

John

Adrian Smith 101/04/2015 20:19:29
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2132 forum posts
828 photos

Thanks John. It has been a real labour of love, but the time spent will be worth it I think. I didn't enter the RCME survey for how long an ARTF took to build as it would have been off the scale!

Edited By Adrian Smith 1 on 01/04/2015 20:20:04

Adrian Smith 104/04/2015 18:05:06
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2132 forum posts
828 photos

Bit more detail to sort out. One big fault i am sorry to say is that although the wing tube fits comfortably in the wing recesses the tube is an extremely tight fit into the tube through the fuz, so much so I had to use a piece of wood and a rubber bodywork hammer to get in the fuz. I think I will keep to tube in the fuz at all times because of this.

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Adrian Smith 104/04/2015 18:07:46
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2132 forum posts
828 photos

I have drilled a couple of holes in the cowl so I can tighten the manifold if necessary at the field without taking the cowl off.

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So to the balance point on the CoG. I have found that I need to add 6 oz of weight to the nose as shown.

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Adrian Smith 104/04/2015 18:11:05
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2132 forum posts
828 photos

Lastly I still needed to place the batteries towards the front to balance so I have made a tray in the cockpit cover to accommodate this. It now balances mid-range around 155mm from L/E.

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Furthermore my next job will be to strengthen the rudder servo rail as I notice that under power the rail give a bit so that's the next job.

Adrian Smith 105/04/2015 16:00:09
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2132 forum posts
828 photos

p1020289.jpgOk so all dressed up and ready to go. For the number crunchers the OS 60 GT will be swinging a 24x8 Xoar wooden prop. The a/c balances a tad nose down, but depending on how she flies I will take a couple of 1 oz weights away. I am going to set up the engine on the ground next and tune it as per OS instructions. Both needles out by 2 full turns to start with. Because I use an electric starter OS recommends no choke as the fuel delivery into the carb may be a bit too much. First job is to set the low speed needle as this LS needle has a wide effective range. The high speed needle is tuned last.

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I will report the stats when I have tuned it, hopefully this week.

KingKade05/04/2015 16:03:50
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512 forum posts
22 photos

It is a thing of beauty!!

Im wellgel!

Kk

cymaz05/04/2015 16:50:58
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8268 forum posts
1144 photos

Gorgeous, look after her.

Did you put any cooling baffles around the engine in the end?

Adrian Smith 105/04/2015 19:01:52
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2132 forum posts
828 photos

Well Cymaz I thought I would see how she performed in the first couple of flights before I contemplated any mods to the cooling flow already provided. However, I haven't ruled baffles out based on the research you pointed out to me. I am just going to make sure she is tuned properly before committing the blue.

Edited By Adrian Smith 1 on 05/04/2015 19:02:33

john stones 105/04/2015 21:03:17
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10181 forum posts
1475 photos

It's a looker and no doubt flys even better yes

John

Adrian Smith 111/04/2015 19:51:44
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2132 forum posts
828 photos

Managed to get some time today to tune the engine. As mentioned before the HS & LS needles start off at x2 out. I used a 30/1 two stroke mix. The low speed needle came down to 1.1/4 turns as an initial setting with the high speed needle set at 1 3/4. This produced a tick over at around 1900 to 2100 RPM with the full throttle reading on the tach at 6900/7100 RPM using a 24 x 8 XOAR beechwood prop. The Nord lock washers seemed to hold the manifold bolts fine. However, I noticed that the teflon joiners that came with the Hatori pipe set allowed some oil leakage during the run-in. What I have done is dismantle the joints & clips and used a HT silicon sealant and refitted the joints to see if that resolves the problem. I am hoping to maiden sometime this week, weather permitting so more on that later.

Adrian Smith 113/04/2015 16:22:29
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2132 forum posts
828 photos

This morning was an ideal time to maiden the Inverza. Wind 0-5mph, WSW straight down the strip and lovely sunny day. Sadly nobody else around at the full size aircraft hanger to film it, so as a solo flyer a couple of snaps will have to do this time around.

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p1020294.jpgI am pleased to say that all went well and after about 25 minutes of flying time in four slots these are my conclusions.

Firstly very little trim was required. One click of up elevator and two clicks of port aileron. CoG seems about right based on inverted flight although I am sure if I took off an ounce of nose weight there would be no stress. I make a habit of not using expo as I need to feel the sticks 100%, but that's purely my preference. Knife Edge was as stable as, if not more than any of my current squadron with little extra stick inputs. Impressive. Rolls were quite scale like as were all the other manoeuvres. I was surprised by the vertical performance as I was able to put in two rolls before entering a stall turn. Normally with my other aircraft I some times need to speed the move up or gravity takes its toll. The 24x8 prop slows her up nicely on finals and helps keep the aeros at a nice scale pace. I may open the slow needle 1/8-1/4 turn the next time I fly to make the throttle pick up a bit smoother. One and only one niggle is the spats. Despite what I considered to be greaser landings I notice one of the spats was split all round the U/C fixing point. Be warned they are flimsy which is disappointing for a kit of this cost. However, the offending item is repairable and I will use my usual trick of carbon fibre tape with West Epoxy resin finished of with car body filler then repainted. Bit of a nuisance I know, but Hey! if that's all that went awry then no probs. I have ordered a couple of replacement spats which I will reinforce before fitting the to the aircraft. All in all a pretty good day.

cymaz13/04/2015 17:38:28
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8268 forum posts
1144 photos

Congratulations yes, engine didn't show signs of getting hot then.....result !

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