Search: Posts Made By: pimmnz
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06-25-2018, 11:26 PM
Replies: 19,392
Views: 2,028,114
Posted By pimmnz

Sad news indeed, but a lasting legacy. blue...

Sad news indeed, but a lasting legacy. blue skies, Bill...
Evan, WB#12
04-24-2018, 07:39 PM
Replies: 906
Views: 74,467
Posted By pimmnz

Cool! Nice to see a few more Simla flying...Still...

Cool! Nice to see a few more Simla flying...Still flying mine Duane, the OS 120 is nearly run in...obviously doen't need to be working very hard...!! I can report that the 96" wing doesn't make much...
Forum: Aerodynamics
04-24-2018, 07:29 PM
Replies: 35
Views: 3,000
Posted By pimmnz

The rudder hinge line angle to the fuselage datum...

The rudder hinge line angle to the fuselage datum has little, if any, bearing on yaw/roll couple. The swept hinge line referred to was supposed to help keep the nose of the airplane from dropping...
03-28-2017, 08:47 PM
Replies: 340
Views: 19,941
Posted By pimmnz

The little bob at the top of the rudder is a mass...

The little bob at the top of the rudder is a mass balance weight...
Evan.
Forum: Aerodynamics
03-28-2017, 08:41 PM
Replies: 7
Views: 681
Posted By pimmnz

Probably pay to build in some washout...

Probably pay to build in some washout though...the originals had 3 deg washout so it wouldn't be 'scale' without it...
Evan.
03-21-2017, 10:21 PM
Replies: 340
Views: 19,941
Posted By pimmnz

For the guy trying to get metal over 'tex on his...

For the guy trying to get metal over 'tex on his wing. I isn't done that way. Pretend the metal leading edge is wood, the original would have the fabric sewn into a bag and slipped over the whole...
03-11-2017, 01:14 PM
Replies: 115
Views: 11,666
Posted By pimmnz

Actually, Matts' ''Superstars'' use the same...

Actually, Matts' ''Superstars'' use the same construction, similar stuff seen on lots of kit models well in to the 80's...not many better ways to make a light, stiff sructure...
Evan.
03-11-2017, 12:49 PM
Replies: 340
Views: 19,941
Posted By pimmnz

http://www.rcuniverse.com/forum/attachment.php?att...

http://www.rcuniverse.com/forum/attachment.php?attachmentid=2204922
03-11-2017, 12:45 PM
Replies: 340
Views: 19,941
Posted By pimmnz

Just noticed, the inner doors on the H-1 are on...

Just noticed, the inner doors on the H-1 are on the bottom of the leg...not attached to the fuselage...dont cover the whole hole, either...

Evan
02-24-2017, 02:09 AM
Replies: 2
Views: 494
Posted By pimmnz

Or, conservatively, consider the plan form of...

Or, conservatively, consider the plan form of both wings as one. Leading of top to trailing edge of bottom, in plan. As the Waco wings are about the same area top and bottom you can do this. Measure...
Forum: Aerodynamics
02-24-2017, 01:55 AM
Replies: 15
Views: 2,185
Posted By pimmnz

Sounds like your calculator has an error. Balance...

Sounds like your calculator has an error. Balance can be behind the wing, but the planform would be for a tandem wing model, balance could be forward of the wing, but it would be a canard layout....
02-18-2017, 11:52 AM
Replies: 340
Views: 19,941
Posted By pimmnz

Repro version that unfortunately crashed a couple...

Repro version that unfortunately crashed a couple of years ago, I have more piccies..well, I was considering doing the long wing version once.
Evan
02-18-2017, 12:35 AM
Replies: 340
Views: 19,941
Posted By pimmnz

http://www.rcuniverse.com/forum/attachment.php?att...

http://www.rcuniverse.com/forum/attachment.php?attachmentid=2201663http://www.rcuniverse.com/forum/attachment.php?attachmentid=2201664http://www.rcuniverse.com/forum/attachment.php?attachmentid=220166...
01-25-2017, 12:58 AM
Replies: 5
Views: 575
Posted By pimmnz

The 163 has built in 'letterbox' slots, which...

The 163 has built in 'letterbox' slots, which work as the AOA increases. this is allied with considerable washout on the original. The lower surface flaps are trimmed with the inner 'elevators' on...
Forum: Aerodynamics
01-25-2017, 12:39 AM
Replies: 11
Views: 2,957
Posted By pimmnz

The 163's inner trailing edge 'elevators' were...

The 163's inner trailing edge 'elevators' were for trimming the pitch change caused by the under wing flaps. Deltas really don't need them (flaps), providing the balance is right and you can get the...
01-16-2017, 12:24 AM
Replies: 340
Views: 19,941
Posted By pimmnz

Wondering why you want to use ally on the...

Wondering why you want to use ally on the wings...they were all ply, fabric covered and doped then painted blue...only the retract legs were an ally fabrication...
Evan
Forum: Aerodynamics
01-11-2017, 07:38 PM
Replies: 19
Views: 1,660
Posted By pimmnz

Yes it's true! Full size airplanes fly awfully...

Yes it's true! Full size airplanes fly awfully slow compared to models, if you want true 'scale speed' then you need to build real light...think 'indoor'...
Evan.
Forum: Aerodynamics
12-23-2016, 03:23 PM
Replies: 3
Views: 1,243
Posted By pimmnz

Hmm, as for 'lifting wing' and 'symmetric...

Hmm, as for 'lifting wing' and 'symmetric wing'...I thought all wings are supposed to provide lift? Perhaps you meant 'cambered' and 'non-cambered'?
Evan.
Forum: Aerodynamics
12-12-2016, 11:11 PM
Replies: 29
Views: 2,710
Posted By pimmnz

Interestingly, the weight increase affects both...

Interestingly, the weight increase affects both ends of the speed spectrum, all else equal, weight increase also decreases top speed. And for much the same aerodynamic reason.

Evan, WB12
12-03-2016, 03:11 AM
Replies: 906
Views: 74,467
Posted By pimmnz

Hi Duane, My Simla has flown, monocoated and with...

Hi Duane, My Simla has flown, monocoated and with an OS120 glow. The 120 was lighter than the 108 I was planning and with quite a bit more power... Very nice, only a click of aileron and elevator to...
05-16-2016, 12:58 AM
Replies: 8
Views: 1,604
Posted By pimmnz

Size and layout is similar to a Pete Russel '362'...

Size and layout is similar to a Pete Russel '362' delta. Those 'flaps' are elevators, ailerons outboard. Not a 'flying wing' as such. Balance about 50% root chord, good size for a 0.40 glow.
Evan.
12-02-2015, 12:03 AM
Replies: 109
Views: 8,322
Posted By pimmnz

I think the ailerons on the original were 'spring...

I think the ailerons on the original were 'spring tab' ailerons, if you put a spring around the main pivot on the drawing above (where it says 'loose') you will get the idea. Flight loads less than...
Forum: Aerodynamics
11-30-2015, 08:56 PM
Replies: 48
Views: 3,810
Posted By pimmnz

That reads like flutter. Check hinges and...

That reads like flutter. Check hinges and linkages.
Evan.
Forum: Aerodynamics
11-28-2015, 10:34 PM
Replies: 48
Views: 3,810
Posted By pimmnz

Tricky one, could be that you havent done...

Tricky one, could be that you havent done maintenance, allowing linkages or horns to loosen, elevator is always the one that has the biggest reaction to such stuff, or maybe you are running the...
11-23-2015, 10:32 PM
Replies: 7
Views: 534
Posted By pimmnz

Simple answer is 'no'. The outer 1/3 of the prop...

Simple answer is 'no'. The outer 1/3 of the prop does most of the work.
Evan.
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