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Author Topic: A Frank Whittle . , Er . . . . PROP ,  (Read 1743 times)

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A Frank Whittle . , Er . . . . PROP ,
« on: February 13, 2016, 07:52:27 PM »
Not wishing to open the cutouts in the spinner , screw the balance on Test , etc , and needing the same Hub Depth for some reason -
started by going to the same depth at hub on em . Remember these are for 10.000 rpm odd aerobatics , not 20.000 rpm RC snoters .

At This Moment , the INNER is at the 2 1/4 spinner Dia.  The BLADE will start there and be faired into the hub for no sudden ' stress raiser '
cross section jumps . theyre for 5 Sec ( + ) laps on long lines on a 55 Oz. Plane . Not that thats entirely relevant , 40FSR is said to run ' steady speed '
if its not overspeeding . id taken it out of the hurricane due to that. modded it for the G 51 THEN fund the original tank had the 1/16 bore ' plumbers ' copper tube feed is inadequate past say a .15, Leaned out over 45 Deg line elevation and dried of overhead so weak tension up there .
 Cant see how that slipped past Q. C.  ??? :P
 So expecting it to behave here .
« Last Edit: February 13, 2016, 08:46:12 PM by Matt Spencer »

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Re: A Frank Whittle . , Er . . . . PROP ,
« Reply #1 on: February 13, 2016, 07:55:06 PM »
appear to 've canned most of the pics , no how someonell have a fit and warn of plauge & pestalance .  :-\


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Re: A Frank Whittle . , Er . . . . PROP ,
« Reply #2 on: February 13, 2016, 08:01:46 PM »
Doing half a dozen file strokes one side , then rotateing 180 deg. axially seems to keep em matched . Ive used selected props with similar grain Ea. side . Some come rather gloopilly grained so I wouldnt use mod. or not .
A Vernieer Check every so often for thickness . And set at say 1/8 and run along the edge to see the ' Chord @ 1/8 ' is the same distance from the
EDGE .

Some NEW arnt even Ea Side , thickness or chord - so may pay to check . Differant batches can be not an exact match too . . .

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Re: A Frank Whittle . , Er . . . . PROP ,
« Reply #3 on: February 13, 2016, 08:16:52 PM »
This has had a line scribed frwd. of T.e. and ' thinned ' to there . For starters .

Zinger 12 x 6 , down from 30 Grame to 18 .  Top Flite 12 x 5  is 20 & thinned Zinger 12x5 ditto . At the moment .
12/6 is evenly  ' arc-abel ( bow ) along length now . Really cunning and you can get a increase or decrease of pitch under load
thinning Fwd. or aft. at hub . So they used to say . Anyone from thwe pre plastc prop Era is welcome to extroplate on tecniques .


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Re: A Frank Whittle . , Er . . . . PROP ,
« Reply #4 on: February 13, 2016, 08:32:11 PM »
theyre for this sucker , OS 40 FSR-S powered .http://stunthanger.com/smf/stunt-design/blame-the-adaminsons-or-what-to-do-with-a-40-fsr-s/

the balance is well forward. as intended . So dont wish excess weight at the nose . And chose to keep the spinner Cut Outs limited .
The Tornado 12 x 5 nylons still nice and flexable , for a yellow one. Guess ive armourall' it . ?  But its weighty .

Good start for a prop from scratch is one face clean , 1/4 hole thru center to get matching grain Ea Side . Mark the ' blank' ( blade outline )

True in with plane , scraper , sanding block etc. Match the HUB front face . Us the verieer to get all these exact & mark up the underface
at edges , plane & dress ( file ) in the underface . Throw a line say 5/16 odd ( more & less along ) the Fwd. edge , carve that and youve got
your traing edge . Mark L.E. up , again . ( if you didnt already ) and back away ( a half or 3/4 varying along ) and get your front planed in and matched.That Verneer to check again.
Marking back AGAIN say 3/8 & 1 in. plus , gets you your top face along the Max. depth . S'f all more than dressing across then with 80 or 100 Wt. on a block will get the curve started .

After that your a bit cautious , and hold up to the light , and things like that . Best to start with well overlength blank & two Vices set
length plus 4 in apart . Gets tiresome swapping blank end for end. So if youve got a tree cut off waist hight , level the ground around it
and set your vices there .  :! S?P H^^


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Re: A Frank Whittle . , Er . . . . PROP ,
« Reply #5 on: March 03, 2016, 08:34:01 PM »
Knuther for the MC 72 & 1 3/4 spinner .

Starting at the ' clearance ' for the spinner , Obsv the markings .


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Re: A Frank Whittle . , Er . . . . PROP ,
« Reply #6 on: March 03, 2016, 08:36:05 PM »
Fineto .Not Yet .

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Re: A Frank Whittle . , Er . . . . PROP ,
« Reply #7 on: March 03, 2016, 08:37:36 PM »
Etc .


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Re: A Frank Whittle . , Er . . . . PROP ,
« Reply #8 on: March 03, 2016, 08:43:49 PM »
And Thus ;

first flew last century 1 bit of a renovation , salt water doesnt agree with the wire / controls . so dont try it there .
Floats are a bit bigger now for bouyancey , Hopeing they wont F up the precision of the flight . Weights going to be
the same 57 Oz. but Muffled now with a Max 40 stunt ( 1970 odd ) rather than the 70 torpedo 40 .



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