Search: Posts Made By: Tall Paul
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10-29-2014, 12:06 PM
Replies: 30
Views: 12,585
Posted By Tall Paul

Some porpoising is caused by an insufficiently...

Some porpoising is caused by an insufficiently stiff connection from the servo to the surface control horn.
Forum: Aerodynamics
10-29-2014, 12:01 PM
Replies: 14
Views: 1,815
Posted By Tall Paul

The cutout works well with those lotsa panel...

The cutout works well with those lotsa panel wings.
For the pivot on a all-moving surface, having the pivot and control horn attach ahead of the m.a.c. is a flight safety thing.
It provides a...
12-24-2010, 05:38 PM
Replies: 90
Views: 10,621
Posted By Tall Paul

RE: c117 crash

I know the people that developed the flight control system on the C-117.
It is fool-proof, but not damn fool-proof, as they have commented on this incident.
It is similar to the B-52 crash.
12-24-2010, 10:53 AM
Replies: 18
Views: 2,484
Posted By Tall Paul

RE: longitudinal dihedral

Diving out of a thermal....
Now I prefer spinning. :)
Forum: Aerodynamics
12-23-2010, 10:57 AM
Replies: 26
Views: 6,390
Posted By Tall Paul

RE: Dihedral/anhedral effect on lift?

This one as a twin had serious vibration in the vee...
12-21-2010, 09:13 AM
Replies: 18
Views: 2,484
Posted By Tall Paul

RE: longitudinal dihedral

You argue against every suggestion!
Why?
Forum: Aerodynamics
12-20-2010, 12:41 PM
Replies: 6
Views: 1,659
Posted By Tall Paul

RE: longitudinal dihedral

Wing incidence... if the most forward part of the leading edge and the trailing edge are at zero relative to a fuselage reference line, or the mid-line of the horizontal, then you have zero...
Forum: Aerodynamics
12-20-2010, 09:14 AM
Replies: 6
Views: 1,659
Posted By Tall Paul

RE: longitudinal dihedral

How are you measuring this?
12-18-2010, 11:46 AM
Replies: 9
Views: 1,078
Posted By Tall Paul

RE: Can you ID this plane?

The rig is only useable after you know where the c.g. is supposed to be.
12-18-2010, 09:27 AM
Replies: 9
Views: 1,078
Posted By Tall Paul

RE: Can you ID this plane?

For straight tapered wings such as this, the mean aerodynamic chord will be at half the semi-span.
Locate the 30% point on this m.a.c., and project that to the fuselage for the balancing c.g.
12-16-2010, 01:14 PM
Replies: 5
Views: 996
Posted By Tall Paul

RE: aelerons for gliders

The aileron servos in my Easy Glider are conventional.. laying flat in the wing out at the aileron location, with a pushrod to a horn on the bottom of the aileron.
I've used this type of direct...
12-15-2010, 09:11 AM
Replies: 54
Views: 4,260
Posted By Tall Paul

RE: cub ground roll

The GP 40 sized J-3 flies like a J-3 with an VT .21 4-stroke. :)
It needed the OS 26 4-stroke to handle the GP floats.
And it flies nicely with an AXI 2820/10.
Forum: Aerodynamics
12-15-2010, 08:56 AM
Replies: 10
Views: 1,572
Posted By Tall Paul

RE: Flat turn

ES-3A was another flying antenna farm.
Navy spent a bundle getting it in service, and then wasted it using it as a tanker.
Very short service life.
12-14-2010, 09:31 AM
Replies: 54
Views: 4,260
Posted By Tall Paul

RE: cub ground roll

On my Tail dragger Kadets, having the axle in line with the leading edge gives almost hands free free takeoff runs..
12-13-2010, 01:03 PM
Replies: 54
Views: 4,260
Posted By Tall Paul

RE: cub ground roll

GP 40 size Cub
Lots of fun to take off!
12-12-2010, 06:02 PM
Replies: 54
Views: 4,260
Posted By Tall Paul

RE: cub ground roll

The ground angle on the J-3 is a bit steep.
This causes the ground loops on takeoffs.
Lengthening the tail wheel strut helps.
Moving the main gear forward a bit also helps.
12-10-2010, 05:17 PM
Replies: 9
Views: 1,226
Posted By Tall Paul

RE: LED arrangement for night flying

Convention is red on the left, green on the right.
And having an illuminated transparent wing really helps!
12-06-2010, 05:16 PM
Replies: 63
Views: 5,150
Posted By Tall Paul

RE: CL-415

These guys are newbies.
30 oz loadings are for experts.
12-06-2010, 10:53 AM
Replies: 63
Views: 5,150
Posted By Tall Paul

RE: CL-415

Yes, and yes. :)
12-06-2010, 10:51 AM
Replies: 22
Views: 3,903
Posted By Tall Paul

RE: Lucybelle or Lulubelle?

The first P-80 was named Lulu-belle.
12-06-2010, 08:47 AM
Replies: 63
Views: 5,150
Posted By Tall Paul

RE: CL-415

Wing loading is usually AUW and all the wing area.
16 oz per sq. ft. is a somewhat heavy loading, but still reasonable.
Looking at your figures and desires, I'd say your airplane is too small.
...
12-04-2010, 03:15 PM
Replies: 17
Views: 2,278
Posted By Tall Paul

RE: hand launching gliders

I just flew a photo flight at a local park, and related the position of the airplane to the images when I processed them.
I never let the plane get 1500' away.. this is with a 80 inch wing.
Any...
12-04-2010, 09:00 AM
Replies: 63
Views: 5,150
Posted By Tall Paul

RE: CL-415

If you're worried about weight more than scale, make the wing longer.
With that Hershey bar wing, more span won't be all that noticeable.
This is a Goldberg Mirage.
Kit span is 54".
It will...
Forum: Aerodynamics
12-03-2010, 03:45 PM
Replies: 67
Views: 5,375
Posted By Tall Paul

RE: All-moving wing tips

You're putting a major control surface at the end of the wing.
What keeps it on?
Where will the actuating servos be?
How will they pivot the surface?
Will the lift/drag loads jam the pivot?
...
Forum: Aerodynamics
12-02-2010, 09:53 AM
Replies: 19
Views: 2,017
Posted By Tall Paul

RE: four rotor toy

The Wrights crashed and killed the passenger, Lt. Selfridge from the US Army at a demonstration of their flyer at Fort Myer, VA.
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