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Forgotten Projects, Rebuilds, Rehabs, etc (Read 4592 times)
Reply #101 - Jul 28th, 2019 at 4:51pm

jwwasham   Offline
Full Member
Go Lemmings, Go!
Oklahoma, USA

Posts: 233
***
 
A beautiful bird, and some very impressive flights.  Well done!  I liked how it landed just a few yards from you on that last flight.  Mine never do that. Wink
 

Experience is what you get, when you don't get what you want.
"Simplify, then add lightness"  Colin Chapman
A closed mind is just a useless weight on the shoulders.
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Reply #100 - Jul 28th, 2019 at 4:37pm

MKelly   Online
Senior Member
Helotes, TX

Posts: 814
****
 
Got home and dug into the videos - here's some footage of the Spitfire at Geneseo:

https://www.youtube.com/watch?v=vJqAD4qcINU

Mike
 
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Reply #99 - Jul 18th, 2019 at 11:38pm

Sky9pilot   Online
Administrator
Stick & Tissue
Kelso, WA 98626 USA

Posts: 10914
*****
 
Congrats Mike...great to hear of the Spitfire performing so well!!! Look forward to the videos.
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #98 - Jul 18th, 2019 at 10:01pm

MKelly   Online
Senior Member
Helotes, TX

Posts: 814
****
 
Thanks guys.  Had a great day flying at Geneseo and got to let the Spitfire spread its wings a bit.  Trimming with for 36" loops of 1/8" rubber went smoothly.  It flew well enough to come in 5th in the Battle of Britain mass launch, missing the final round by 3 seconds, and I was able to get three flights right around 1 minute for FAC Scale.  Very pleased with how it flies.  Will put up some video once I've returned from the trip.

Mike
 
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Reply #97 - Jul 14th, 2019 at 6:54pm

Kerak   Offline
Senior Member
I Love YaBB 2.5 AE!
Roy, Utah

Posts: 2285
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Hey Mike...errr Tex, that's just about the most beautiful Spitfire that ever was (is)!  Smiley

Neal
 
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Reply #96 - Jul 5th, 2019 at 9:38pm

neoflight   Offline
Full Member
...now how am I gonna
get that down!
West Tennessee

Posts: 201
***
 
Spectacular build and flying, Mike Smiley On your 250 and  300 turn flights it appears your Spitty was attacked by a couple of crafty Bf-109s  - Killdeer  Grin Grin Grin
 
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Reply #95 - Jul 2nd, 2019 at 3:35pm

bigrip74   Offline
Administrator
What did l do this time!
Austin, Texas

Posts: 6043
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Beautiful flight on the spitfire. Will be waiting on the Waco story.

Bob
 

IF IT AINT BROKE DONT FIX IT!
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Reply #94 - Jul 2nd, 2019 at 3:25pm

Sky9pilot   Online
Administrator
Stick & Tissue
Kelso, WA 98626 USA

Posts: 10914
*****
 
Outstanding maiden and trim flights.  She's a real beauty!  I envy your trimming site!  Sorry to hear about the WACO... I'm inspired to try to get something in the air asap.
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #93 - Jul 2nd, 2019 at 11:06am

pb_guy   Offline
Senior Member
So I'm just a kid at heart.
Youbou, BC, Vancouver Island

Posts: 1460
****
 
Sorry to hear about the Waco incident Mike. But, like Pete said on HPA, it can be fixed. But the Spit looks great both on the ground and the air.
ian
 
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Reply #92 - Jul 2nd, 2019 at 9:31am

MKelly   Online
Senior Member
Helotes, TX

Posts: 814
****
 
It flies!  Took it out yesterday and did some initial trimming with a short, fat motor.

https://www.youtube.com/watch?v=PiFyDNOI0Ck

Spitfire came home in one piece, Waco was in one piece but a slightly different geometry at the end of the day - but that will have to become it's own story...

Mike
 
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Reply #91 - Jun 29th, 2019 at 10:52pm

Sky9pilot   Online
Administrator
Stick & Tissue
Kelso, WA 98626 USA

Posts: 10914
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I remember my Robart Incidence Meter...thanks for the link, I'll post this in our gadgets, tools etc section. 

Amazing how this give you an accurate picture of the twist in that Spit's wing.  I like it!  Your fiddly bits really make this bird stand out!!! Smiley
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #90 - Jun 29th, 2019 at 9:21pm

MKelly   Online
Senior Member
Helotes, TX

Posts: 814
****
 

The Spitfire is done!  Rigged the tail, painted the prop and spinner, finished up the lights and installed the antenna and antenna wires. 

I had to play with the stab mount a bit - I built a Schmidt incidence meter (http://www.modelflight.com/incidence.html)  and checked the decalage, decided I needed to allow a bit more negative incidence in the stab.  The wing twist is dramatic when you measure the incidence: +2deg at the root, -.75deg at average chord, and -6deg at the tip - 8 degrees of twist across the span!  I set the stab for 1deg negative incidence compared to the wing at average chord as a starting point with adjustment to go another degree and a half if necessary.  We'll see how it flies...

It took about 5g noseweight to balance the model at the TVo-calculated cg (~47% of average chord, 2.25" back from the LE at the root).  I drilled holes in the noseblock well and embedded three fishing sinkers in the cowl to get things close, then added a bit of clay over the lead to get to the final balance.  Weight without motor is 68.7g.

Look forward to seeing how it'll do in the air.

Mike
 
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Reply #89 - Jun 28th, 2019 at 6:30pm

MKelly   Online
Senior Member
Helotes, TX

Posts: 814
****
 

Got the rest of the gingerbread on the wings (tip lights, walkway lines, gun port patches and landing gear) and finished up the noseblock and spinner assembly today, along with adding a second set of magnets on the lower wing root as insurance against the wings popping loose in flight.  Still have to paint the power unit and do final assembly on the tail group.

Mike
 
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Reply #88 - Jun 25th, 2019 at 9:54pm

Sky9pilot   Online
Administrator
Stick & Tissue
Kelso, WA 98626 USA

Posts: 10914
*****
 
Amazing how those fiddly bits make a model come alive!!!  This is an awesome job!!! Smiley
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #87 - Jun 25th, 2019 at 9:39pm

MKelly   Online
Senior Member
Helotes, TX

Posts: 814
****
 
Thanks guys, feels like I am in the home stretch now, fuselage is about done after today's work.  I made assorted lumps, bumps and fairings today for the cowl and tail group as well as making the antenna and fuselage lights.

Mocked it up and did preliminary weight and balance on it this evening.  63.2g empty weight, with another 4g needed to get the CG in the calculated spot.  Not a featherweight, but not as bad as I had feared.  The calculated CG is pretty far back (47% of average chord), so I wouldn't be surprised if I had to add a bit more noseweight during trimming.

Tomorrow I'll tackle the gingerbread on the wings, once that's done it'll be ready for final assembly.

Mike
 
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