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Hybrid 60" Plank


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Did 2 coats of light filler tinned to double cream with a bit of talc but no water

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Went on quickly, was a bit worried about all the bits in the mix - but sanded away quickly, sprayed with deep fill primer and sanded to what I thought was a nice finish 🙂

This went much faster than a PSS I did before, think it was applying the glass early in the process as this gives plenty of warning of potentially wrecking the surface by sanding through to the foam.

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Had a bit of a disaster with the Montana Gold. Paint looks as if it dried before hitting the wing - result is a finish rough as 90 grit, and I'm not joking 😬

Didn't hep that I didn't have my reading specs on so didn't realise until I'd finnish - was just way over-confident given success on a previous model.

Decided just to go with it as it's just a 'quick' slope model, hay ho ... 🙄

 

 

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And a bit of a storey behind the wing bolts: used test part print of fus to align tap at correct angle, it's balsa  so threads need toughened up with CA a 2,3 times, impatience got the better of me and I managed to retap before the hot CA had completely cured ...

 

Wrecked tapped hole and tap 🙄

An insert nut saved the day, remembered to coat bolt with wax and epoxied inset in and it  worked fine, phew! (and one side seems to be enough) 

 

 

Edited by Mike Chantler
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Thank you for your interest  🙂 

Programmed radio yesterday, so all I have to do is nose weight. Was going to do that today - but the Pentlands seem to be in the doldrums so will have to wait (hopefully) until next week.  

Interested to see how much heavier it will be than the version covered in laminating film.

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Ready to go and with nose weight it's 1120g

 

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That's about 250g heavier than the laminating film version. That said, I normally fly the lam version with half ballast to give reasonable loops and rolls, so given that it's a lot cleaner it will be interesting to see how it flies 🙂

 

Hopefully we'll have wind on Sunday 🙂

 

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  • 2 weeks later...

Took it up the Sunday before last - and it was a bit like a bucking bronco, suspected CoG, had rough landing, broke front bolt and snapped rear fus. so could not experiment that day.

 

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Measured CoG when home, and some how or other it was 3mm further back than intended (duh 🤔 ) Thought I'd been pretty careful with setting it up as well 😮

 

Anyway, adjusted CG and up hill last Sunday

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and it seemed to fly very well, PW51 seems a lot more slippery,  faster and tracks well. Well pleased 🙂

 

Somehow or other I managed to get the control horn holes too far forward (again, thought I'd been quite careful here!!) but I seem to have almost twice the amount of up as down!!

Rolls are currently very non-axial, which I'm putting down to the tons of +ve differential, and I have a feeling that planks require a little -ve differential?

 

Anyway - will get some programmable aileron and elevator differential added for next trip. Looking forward to getting that sorted and adding ballast 🙂 

 

 

Edited by Mike Chantler
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