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Author Topic: Cape Town MEWGULL .  (Read 33864 times)

Offline Air Ministry .

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Cape Town MEWGULL .
« on: September 16, 2015, 07:27:13 PM »
Sketched in 2005 while observing little black ducks trying to steal fish from Pelicans . No aerodynamic relationship there , though .

« Last Edit: January 24, 2016, 10:09:17 PM by Matt Spencer »


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #1 on: September 16, 2015, 07:32:43 PM »
The Poms refer to this as an Anular Intake , which sounds a bit annal . As its Actually  Peripheral  , like the Cosmos . So Periferal Intake .
As OS 40 FSR-S's are said to require Crankcase Cooling ,the peripheral cooling intake feeds through around it , The primary section 1 inch long ,
1/16 at the front tapering out to 1/8 in. at the rear - 1 inch mark. Which we all know should halve the cooling air speed , giving it twic as long
to do its stuff.


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #2 on: September 16, 2015, 07:37:15 PM »
Read the Adaminson Typhoon article back in 75 , with its sparless Epox balsa core skin treatment , and also one or two things on High A/R types they persued .
This thing was conceptualized back there then , sketched 30 years later , and being built 40 years on . . . We shall pretend we're developing Patiance ! .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #3 on: September 16, 2015, 07:44:10 PM »
Me Netzbands article on drag Vs A/R had a hand in it too. His hypothesis that a 8:1 A/R has half the drag of a 6:1 ( or whatever )
was born out on my previous 72 span 9 chord 60 49 Merco Mewgull , which in wind gained speed in the Horiz. Sq. eights .
 Accelerated through the manouvre . And the wings didn't fall off .

though this here is a separate design study , wing spar layouts similar . But the ribs between the 1/4 sheet spars Grain is Vertical.
Thus the ribs are Three Piece . Center , front & rear . Which explains the slightly square appearanece at this stage.


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #4 on: September 16, 2015, 07:45:27 PM »
This is taken from a different angle.


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #5 on: September 16, 2015, 07:47:06 PM »
Apparently I took a few earlier , so here they are .

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #6 on: September 16, 2015, 07:59:09 PM »
The Spar joiners is 1/8 Ply 2 in wide on the inside face .Tapered to 1/16 over the first bay out . Bellcrank Bolt captured in the top One .
weel , that's all . Part from this is where the curves and curls originate , with a degree of elasticity eencorperated .

Spans 68 Avg. Chord with near full span flaps 7 in . Spinners 2 1/4 .  Dunno when itll be finished , but maybe first .
Back to the dungeon to sort out the controls and undercarriage .
Will be a first with the du bro plastic hinges for me, so lectures on fitting reguired .
Moulds for the top decks , canopy & gear leg fairings soon .
will pre dope /sand the wing sheeting , and maybe some white 2 pot for finish .



Its in this ' Capetown ' spec that the features are evolved from . The peripheral Intake about the spinner being evident in the picture.





isn't it pretty



heres the kneadle nose version with different cowl my earlier one was based on .
« Last Edit: September 17, 2015, 11:32:48 PM by Matt Spencer »

Offline Avaiojet

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #7 on: September 17, 2015, 10:00:33 AM »
Matt,

You have a really nice project started.  H^^

 The Percival "Mew Gull," an interesting aircraft to model.

All the 30 Racers are great aircraft to model. I can honestly say I've built a few of the 30's racers.

Certainly interesting and destined to be an eye catcher.

That Mew Gull had some interesting schemes.

Good luck!

Charles

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #8 on: September 17, 2015, 10:58:12 PM »
Thanks for the kind  comments . I can see why super glues popular , waiting 12 Hrs plus , per stage , gets the goat up . >:(


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #9 on: September 17, 2015, 11:01:53 PM »
Thats the cooling duct to the case , a good 1/16th in. Its sitting ' going off ' with the aryldite , at the moment . pinned & gaped even .  :P


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #10 on: September 17, 2015, 11:06:50 PM »
Thats last nights effort , the vane / spacers . Dialed in this morning & another ' delay ' while it kicks off . >:(

The peripheral ducts I suppose the moe demanding part to set up right. apart from all the others . LL~

This is looking forward ( from the Cockpit  :##) overbanked in a turn . :-\ ;D


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #11 on: September 17, 2015, 11:10:21 PM »
Heres the vane / spacers . and the results of carelessness with the hacksaw .  :-X

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #12 on: September 17, 2015, 11:23:01 PM »
A few more pretty pictures for the file .





« Last Edit: September 17, 2015, 11:44:50 PM by Matt Spencer »

Offline Avaiojet

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #13 on: September 18, 2015, 09:59:24 AM »
Here ya go!

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #14 on: September 18, 2015, 08:58:54 PM »
It gets Complicated ! as theres THREE series of Percival Mewgulls . ( separate designs ) and Henshaws G-AEXF was a E2H and went through
continual progressive development . Edgar Percivals late one G_AFAA was a E3H , which was another complete redraw .

This one im doing is Henshaws in ' Cape Town ' record spec . elasticated !



My previous 72 span one was 38 Kings Cup spec , ish .





Though Comparable , aerodynamically the one being built is a different ballpark .
Was astounded with this at the two lap glide , and that the wings didn't fall off ,
even in a 20 mph wind . Unmuffled Merco 49 on 15 or 20% nitro on a 12 x 6 wood ,
would four stroke around effortlessly , tho 70Ft lines are as short as youd want .



That's a Bedford , not a Chev.  >:(

Flying it here ,reserves on the shore to seaward of those lakes , pines down the beach line . youd get the onshore breeze over the pines ,
and the ground breeze left to right along down to the right . So wind sheer at about 50 Ft. alt. and a big rock of
the tips through the downwind loop of the overhead eight . Though id didn't drag me down the field or go loose
on the lines .







« Last Edit: September 18, 2015, 10:03:06 PM by Matt Spencer »

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #15 on: September 18, 2015, 10:12:32 PM »
Last Nights Efforts


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #16 on: September 18, 2015, 10:49:20 PM »
This Morning .

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #17 on: September 18, 2015, 10:55:56 PM »
Seeing We Mentioned 40FSR S .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #18 on: September 18, 2015, 11:03:55 PM »
Nuther Picture.



and one I cant find the source , again . So photoed the copy ! . ???


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #19 on: September 18, 2015, 11:09:45 PM »



Offline Dennis Adamisin

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #20 on: September 19, 2015, 07:10:34 AM »
The Perrcival Mew Gull looks like a stunt model that was later blown up to full size - not the other way around.  You are off to a great start!  H^^
Denny Adamisin
Fort Wayne, IN

"Dear Lord, please keep your arm around my shoulder - and your hand over my mouth..."

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #21 on: September 19, 2015, 09:50:06 PM »
Cheers , the Orange Crate & Eclipse articals were devoured before drawing the green one , thats a 23 % airfoil .
The new ones thicker with long flaps , to chase the elusive  " Five Foot square " tho Id considered this layout 75 .
Michealangelo and Orvil Wright can take some of the blame too . . .  ;)

By Jove : http://www.britishpathe.com/video/flight-record/query/Henshaw

https://www.flightglobal.com/pdfarchive/view/1939/1939%20-%200422.html
« Last Edit: September 20, 2015, 09:18:59 PM by Matt Spencer »

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #23 on: September 24, 2015, 06:39:02 PM »
Got the Bellcrank in , which is one of those hurdles on these things .

Only SNAG was the washer recessing itself and pushrod binding , so threw another washer in . As the center on leadouts / Rib leadout cut out line
gave me a whole 1/8 center from the ply plate , which is a notch more than I usually allow , then end up having to put a trench for the pushrod .  >:(
Washed it all in acetone & assembled with grease & lubed with a few drops of Moreys . Kink in pushrod is at edge of ply when rods fully forward ,
so rod & leadout don't occupy the same space / time continuum . or place . All free and easy and No Slack . Which is a good start .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #24 on: September 24, 2015, 06:40:29 PM »
Its from 2 m.m. steel .
About as minimal as I go , so if it freeflights across and gets arrested by the lines , it wont fold up ( we hope ) with say a 1450 gramme plane in a 20 mph wind .
we hope .
Leadouts are double .018 7 strand laystrate . Pushrods 3 / 32  ends . Likely lapped , bound & soldered . as the aft ends a bit light , so far .

« Last Edit: September 24, 2015, 06:58:28 PM by Matt Spencer »

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #25 on: September 24, 2015, 06:42:54 PM »
1/8 brass tube & brass washers for leadout & pushrod bearings .

Uses a 5 / 32 mounting bolt . I will ad another 1/8 ply plate over the spar ( outside ) so it cant weave around and come loose .
Gives it a bit of cantilever support , we thinks .

« Last Edit: September 24, 2015, 07:00:51 PM by Matt Spencer »

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #26 on: September 24, 2015, 06:48:01 PM »
Picture of where the Airfoils at . though ive used 1/2 for the flaps & Id drawn 3/8 . Makes the t.e. 1/8 thicker , as ive just figured out .
Nice quarter grain flaps are stiff light & torsionally good anyway , and a bit late to ' adjust ' that . Works in o.k. but didn't check before cutting .
Most Likely for the better , as less drag & stiffer . Perhaps . ( 1/8 deeper at hinge than the lines on the fuse there . )


Offline Serge_Krauss

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #27 on: September 28, 2015, 09:59:29 PM »
That's what I love about your planes, Matt. You don't hold back on ANYTHING! 'looking forward to seeing more.

SK

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #28 on: October 07, 2015, 05:29:11 PM »
123


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #29 on: October 07, 2015, 05:33:07 PM »
notta lot done last week on this.


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #30 on: October 07, 2015, 05:37:03 PM »
321


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #31 on: October 07, 2015, 10:59:54 PM »
etc


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #32 on: November 26, 2015, 04:20:59 PM »
The Porcipine , back onto it . pre Doped the sheeting with two coats Sig Nitrate & blocked flat with 220 wt.

That's Dope in the Coffe Jar . The REAL coffe jar is bigger now .  and on the shelf .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #33 on: November 26, 2015, 04:33:29 PM »
A few details if the pictures legible .

Sci Fi , man. Might have to sit back to get it in FOCUS .
Inside the wing , sheeted. The little dots are beads of excess glue , titebond .
Was Conveniant doing the rear sheeting first . The Structures similar to the Beringer FLAT SPAR set up.

Spars are 1/4 sheet. you get two from one four inch sheet . The 1/16 TE sheetings FLAT . The inner faces
are synomonous at the joint - SO did the top sheeting first . Doing the bottom sheeting I found you could
get a finger thru from the front under , to get the joint nice .

Glue on the t.e. & ribs & front of sheet , Fitted & pined ( tacked ) forward . Worked up firm to spar
then te tacked and a block used to push down sheet at ribs to ensure ( I hope ) a decent fit .

Went over it again after pining after the glue had firmed up away , with the finger tip then a block ' seating ' the fit .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #34 on: November 26, 2015, 04:37:06 PM »
Wong Picture , ACTUALLY the beads are on THIS one. Both are looking aft , the t.e. is 1/4 x 1/2 .

The twirly thing across is double .018 laystrate leadouts . The Camera lens is IN the open front at the l.e.
Far Out.

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #35 on: November 26, 2015, 04:42:05 PM »
Threw a couple of 7/16 nuts with 5 g. lead inside & pva , for tipweight . just Over an ounce total , bar glue & keeper .
Nice shiney new nuts that came with new bolts for the flywheel  for the 4.1 Ford six . Finally found a use forem .

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #36 on: November 26, 2015, 04:50:53 PM »
Will show the leadout guides as it shows the shallow angle thru / along the under spar , and the ' tip block ' shape to catch the t.e. & l.e. sheeting .

Would be easyer to use Beringers ' wrapped l.e. & eliminate the 1/4 sheet l.e. whichis so soft moulded sheet'd  be stonger . AND an easyer fit .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #37 on: November 26, 2015, 04:56:25 PM »
A Bit TRICKEY to get adujustable leadout slots through at that shallow angle that don't catch the wind , & the bolt'd have to be vertical ?
unless some cunning sod has figured it out ? tell me more !

that's a 3/32 brass tube ( with the cable thru. ( drooping @ the right ) ) . epoxied with a 1/4 x 1/16 ply keeper across under spar

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #38 on: November 26, 2015, 05:07:06 PM »
JUST one more, seeing we're at it.

Tip Blocks & Spars over a  a 1/16 lite ply former after the end rib @ centerline . ( cr. of airfoil )
The spars are planed to alow a easyer curve over the last few ribs . the whole thing narrows dow towards the ends .
( tips ) so the spar dpth also tapers going out , when planed & bloked ( sanded ) to the curve & flush with Aft Sheeting .
Ive used 3/32 sheeting for the l.e. A bead to the front edge and glued to the L.E. ( its drying now )The glue to Fr Ribs &
the sheet to spar faces , crve the sheet down & pin & let cure .

Unbenching PVA type glued structure prematurely ( a week in winter a few hours in summer ! ) can lettem get askew ./

This dithering about building lets the assemblies stress relieve and harden up at least. Usually knocking a plane up in a week or two
then flying its only feasible in summer . winter a pva'ed Combat wing Would go ' all soft ' if flown at the weekend after building in the damp .

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #39 on: November 27, 2015, 06:45:01 PM »
More toil & trevail .you can see the flanks of the spar shaved in to match the sheeting.knock off the ridge curved and presto. An Airfoil .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #40 on: November 27, 2015, 06:47:26 PM »
Some Resemblance to an aeroplane .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #41 on: November 27, 2015, 06:49:27 PM »
Looks a bit like a Nobler .  >:D LL~ :##


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #42 on: December 01, 2015, 08:27:38 PM »
Infernal BLOTTING PAPER WOOD .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #43 on: December 01, 2015, 08:35:52 PM »
Not to Worry .  ???  With Titebond it removed o.k. ,Shaved the top of the L.E. down flush with rib ( which is easier fit than trying to get a exact fit BETWEEN a L.E. & Spar )
Set up to go with with this Flat / Parrallel ( fore & aft ) Spar trip might be to shave front & rear of spar Before Fitting , maybe ' down a wire ' the sheet depth. Though might pay to leave four or five even spaced flats across , as you can put a straight edge across , with say a 1/2 block & mark that line down the L.E. & T.E. ,
Spliting this ( halving ) gets an exact centerline .
Both these would simplify the set upquare Ribs , Fit the L.E. & T.E. , Taper ( finish ) L.E. thn cut inside a template across to spar. Aft is straight line .
only Problem is youd be better with  knife that cut round corners ! .

Heres the Sheeting Refitted with tape holding down & aft over Ea rib .

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #44 on: December 01, 2015, 08:39:47 PM »
Damped the outer face of the 2 mm sheet and gave a bit of a curl across it , before nailing it down.

Heres ' the end ' , with its wonderous curves and intersections.


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #45 on: January 17, 2016, 06:59:21 PM »
Done a bit more on it , Elevators at the moment .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #46 on: January 17, 2016, 07:01:23 PM »
Morris ? Elev Horn .


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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #47 on: January 17, 2016, 07:04:04 PM »
Tapered 5/16 cedar let in for horn ears , Trim the ribs , and true before sheeting . reinf. for hinges in there ( 3 a side )

Id put the ribs on the LE as rectangles , found ' square ' of the bench , for the TE centerline , then marked the ' Vee ' of the ribs ,
the sheeting / taper is steeper as it goes out , so one needs to keep ones eye in , as it goes . To keep the symetry with NoTwist.

The Orange Crate & Eclipse ( Adaminson ) were referances for development, with the peripheral cooling subduing ( we hope ) the FSR runaway .

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #48 on: January 18, 2016, 05:27:49 PM »
The Weight , Bare Airframe with motor & spinners about 39 Oz at the moment .

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Re: Blame the Adaminsons . . . . , or what to do with a 40 FSR-S .
« Reply #49 on: January 18, 2016, 05:30:24 PM »
Balance Point , rule of thumb ? well its at the thumb ! so Fd of LE with engine in ,  :-\ Shouldnt need noseweight anyway .


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