Windscreen

Quite a challenging task, probably the scariest in the whole project. First is to trim, trim, trim the windshield to size. The factory recommends an angle grinder. I used a Dremmel with a 38 mm grinder. Took most of a day and a lot of patience to trim the windscreen to fit exactly. There’s no going back if you trim too much! It’s a very dusty job, outside with a mask. To get the lines to trim and for the bonding itself, use good quality vinyl line tape to mask, mask, mask and get clean lines. The Sikaflex gets everywhere. Everyone says that, but until you use it you don’t really believe them. Lots of gloves lots of masking tape. Some help. There are several bottles to use. Cleaner (called activator the big bottle) Primer for GRP, Primer for the window itself. Take your time (it took us about 4 hours). Get some help (Thanks to Graham for all the tips). Get the Sikaflex evenly squished by using spacers. (It’s Important to read the Sikaflex application notes (mostly for marine applications) in addition to the Sling instructions. I am very happy with the end result.

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Filling the Brake System

Messy job. On advice, I feed the brake fluid from the cylinder up to the reservoir. The trick is to be sure to remove all air bubbles from the master cylinder and purge the air out. To do this it’s important to have the centre console loose so it can be moved upside down allowing the air to move to the highest point.

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Control panel

I sprayed the panel myself with Paragon Paints enamel Black (Night) BS381C – 642 , not too black, tried to match the black leather than go all out black black. With about 10% PT8 synthetic thinners. I am very happy with the result of the engraving done by Bay Engraving. I finished it off with 4 coats of good quality clearcoat. (Oppted for the longer lever for parking brake).

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Aligning the flaps and ailerons

This turned out to be quite a tricky step, requiring lots of patience. It’s important that the flaps and aileron trailing edges are aligned with a (string) line from wing root to wingtip. My process. Attach rivet, clamp in place, and check alignment. Realign, rivet. I spent several days on each wing for this step. Plus some back and forth with the factory. Top tips, use duct tape to hold it in place. Use a rivet with the mandrel removed to form an easily removable rivet place holder. Take your time. In the end, the LH flap aligned with hardly any match drilling. The LH aileron required 3 attempts but went on quite well after fully clecoing it first. (including dimpled holes). The RH wing was the other way. The flaps required several attempts and in the end many of the outboard holes needed to be match drilled (no more than ΒΌ of a hole). The RH Aileron aligned with no match drilling. Just tolerance build-up I suppose.

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Fuel tank testing

I tested QB fuel tanks in several ways: Baloon test – test the circumference over 24 hrs Soap test high concentration of washing up liquid – look for bubbles Manometer test – 700 mm column of water. Look for change at constant temp and atmospheric pressure All tests are tempo and pressure-dependent. Probably the manometer is the most reliable if done the same temp to the same temp over x hrs. I pressured the tank to about 700 mm (using my lungs) and watched for a change over 24 hrs. The pressure initially changes as the temperature of the air equalises. In my case, both tanks were absolutely fine no leaks whatsoever. Less impressive were the 2 rivet tails found in each tank. Anyway managed to remove them out through the filler cap. Talking of filler caps. My QB tank has a ‘feature’. The filler cap receptacle is not aligned correctly. Attaching the fuel tanks to the wings took a long time, to align and figure out how the brackets go.

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Flaps and Aileron assembly

My last work with Aerowave was to do the priming. Happy to disassemble the paint booth to make some space in the workshop. It’s getting quite busy with the wings in there as well now. Assembly was quite routine, and a rewarding experience. Top tip for later. Fully cleco up all skins even the ‘do not rivet’ holes to get the skin formed for easier wing alignment.

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