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Search: Posts Made By: Himat
Showing results 1 to 25 of 90
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Forum: Seaplanes
03-06-2016, 11:31 AM
Replies: 4
Views: 1,217
Posted By Himat

If you have not an eleborate calculation on wing...

If you have not an eleborate calculation on wing and tailplane incidence, to set both at 0 is probably a god starting point. With the engine on a pod more or less above the wing, a few degrees up or...
Forum: Aerodynamics
02-10-2016, 11:10 AM
Replies: 4
Views: 4,415
Posted By Himat

I am not that well versed in lifting line theory,...

I am not that well versed in lifting line theory, it gives an approximation of what angle of attack to expect, but I do not know if it cater for how airfoil camber and thickness distribution modify...
Forum: Aerodynamics
02-08-2016, 12:26 PM
Replies: 4
Views: 4,415
Posted By Himat

You specify: Cruise CL = 0.05 at 0.6 degrees...

You specify: Cruise CL = 0.05 at 0.6 degrees angle of attack.
A question here, why do you specify both Cl and angle of attack?
With a given weight, wing area and wing plan form you fix the wing Cl...
Forum: Seaplanes
03-29-2013, 10:31 AM
Replies: 10
Views: 2,303
Posted By Himat

RE: North Star as a Full scale aircraft?

First I do think the CoG and CoP have been confused. The CoG, Centre of Gravity, do not move on an aircraft with speed. (If not on purpose by pumping fuel between different tanks or moving ballast.)...
Forum: Seaplanes
02-06-2013, 01:08 PM
Replies: 712
Views: 224,834
Posted By Himat

RE: Seaplane pictures

Picture of this winter two building projects. One is an own design to test a different hull, the other is a Laker. At least it started as a Laker that I bought ready built, but I had to rectify a few...
Forum: Seaplanes
10-15-2012, 06:49 AM
Replies: 35
Views: 22,310
Posted By Himat

RE: Frequently asked questions about Seaplanes

A "hard" or "sharp" corner between the bottom and side surfaces of the hull make the water unstick the floatsurface and improve the planning properties of the float. I guess pronounced "chines" on...
Forum: Seaplanes
02-02-2012, 11:38 AM
Replies: 712
Views: 224,834
Posted By Himat

RE: Seaplane pictures

Two pictures of a seaplane experiment several years ago. Itdid not work and I crashed the plane on the second flight.
Forum: Seaplanes
02-02-2012, 11:24 AM
Replies: 57
Views: 8,306
Posted By Himat

RE: post Cub, and other float plane pics

Not a Cub.
Rather an experiement that did not work. I crashed the airplane before I was able to make the hull work as intended.
Forum: Aerodynamics
11-27-2011, 03:07 PM
Replies: 20
Views: 2,605
Posted By Himat

RE: swept wings

As I understand it, sweep work as a Cl dependant dihedral.
This can be of use when designing a modell, at high angles of attack, i.e. high Cl the wing have dihedral.
At low AoA there is less...
Forum: Seaplanes
06-14-2011, 12:23 PM
Replies: 5
Views: 2,318
Posted By Himat

RE: RC airboat Props?

Pusher or tractor prop, use one according to the engine manual.
As this is a boat and not a plane the speed range is probably lower.
A low pitch and large diameter within the range should do....
Forum: Seaplanes
05-03-2011, 10:03 AM
Replies: 43
Views: 6,996
Posted By Himat

RE: Aqua-Star Seaplane by Herr Eng.

Once a modell aeroplane was constructed from a sketch with some hand written notes on.
(Been there, done that.)
Actually, that set of instructions toghether with the pictures and dimensions are...
Forum: Seaplanes
05-03-2011, 08:37 AM
Replies: 43
Views: 6,996
Posted By Himat

RE: Aqua-Star Seaplane by Herr Eng.

The pointed step might have some adventages:
-Less resistance at high planing speeds. Not critical fora small light modell aeroplane.
(Searc the internet for "pointed step", a NASAserver holds a...
Forum: "1/2 A" & "1/8 A" airplanes
05-03-2011, 08:08 AM
Replies: 5
Views: 1,261
Posted By Himat

RE: microjet ll and a-10 warthog man articles needed

Ok, here is the A10. Probably twin EDFis easier to implement today.
Forum: Seaplanes
05-03-2011, 07:41 AM
Replies: 43
Views: 6,996
Posted By Himat

RE: Aqua-Star Seaplane by Herr Eng.

The Herr Aqua Star is if memory serves me right and internet forums are credibible a scaled down Sealane.

At lest it look like a scaled down version of a larger airplane. And reading about the...
Forum: "1/2 A" & "1/8 A" airplanes
03-08-2011, 12:40 PM
Replies: 5
Views: 1,261
Posted By Himat

RE: microjet ll and a-10 warthog man articles needed

If you think about the twin Cox powered A10 with cut down propellors in PET can duct's, maybe.
Give me a fourtnight and I might be able to dig it out, I have had the magazine.
Forum: Aerodynamics
01-21-2011, 12:43 AM
Replies: 41
Views: 6,933
Posted By Himat

RE: Is L/D ratio a measure of aerdynamic efficiency - can i use it to help refine my airfoil choice?

L/D is a number that do say something about how well an airfoil do at a certain speed. Or more correct at a certain Reynolds number. And like pimmnz states, at model aeroplane speeds, Reynolds...
Forum: Seaplanes
01-21-2011, 12:28 AM
Replies: 10
Views: 2,809
Posted By Himat

RE: ? salt water floatplane?

I understand that one, noise limitation. Have run into it myself, but never of salt water, probably why I didn't think of it. Usually it's only on small lakes in built up areas where thats a problem....
Forum: Electric RC Jets
01-09-2011, 03:07 PM
Replies: 19
Views: 5,254
Posted By Himat

RE: Starting point in EDF for slow large aircraft

Ascale or scale looking business jet could be made to handle at low speed. With poded engines, air intake and exit could be shaped for low speed thrust.The point is to find a jet aeroplane with...
Forum: Aerodynamics
12-30-2010, 11:59 AM
Replies: 380
Views: 35,817
Posted By Himat

RE: my take on wings

And remember, unless you are studying a wing in a wind tunnel, it is the wing that move. The air is "stationary".
Stationary in qouotes as it get bumped around by the passing airplane.
(Before...
Forum: Seaplanes
12-14-2010, 01:18 PM
Replies: 10
Views: 2,809
Posted By Himat

RE: ? salt water floatplane?

One question, why an electric float plane of salt water?

My choice for salt water flying would be a plain bearing glow engine. No bearings that rust and after a "bath", a flush with clean fuel and...
Forum: Scratch Building, Aircraft Design, 3D/CAD
12-11-2010, 12:05 PM
Replies: 10
Views: 6,619
Posted By Himat

RE: info about Drone (BTT3 Banshee)?

Thanks from Førde!

Interesting project, a 1-1 scale model , I look forward to follow the progress. As for a company with a 5 axis milling machine, EasyForm (Easyform.no) colocated with the...
Forum: Scratch Building, Aircraft Design, 3D/CAD
12-10-2010, 10:54 AM
Replies: 10
Views: 6,619
Posted By Himat

RE: info about Drone (BTT3 Banshee)?

Following the link you provided I found a pdf file on the banshee.

http://www.meggittdefenceuk.com/PDF/Banshee%20aerial%20target%20system.pdf

Wingspan: 2.49m
Lenght: 2.95m
Height: 0.91m
Wing...
Forum: Questions and Answers
12-08-2010, 01:16 AM
Replies: 16
Views: 1,471
Posted By Himat

RE: Hobby King- wheres the stock

Myself I'm no big buyer at H.K. Or other own brand "cheap" stuff. The rationale, I usually scratch build and see no reason to put a $2 servo with dubious quality control in a 100 hour airframe. On a...
Forum: Questions and Answers
11-26-2010, 03:41 PM
Replies: 27
Views: 20,909
Posted By Himat

RE: Trailers Torsion bar suspension VS Leaf spring

Leaf spring or torsion spring, any trailer that is designed as a rugged load hauler will bounce when empty or lightly loaded. You don't need a 3500lb capacity to carry modell airplanes (or fullsize...
Forum: Questions and Answers
11-26-2010, 05:07 AM
Replies: 1
Views: 604
Posted By Himat

RE: Duct fan ?????????? OK MODEL TYPE II

The fan did come with OK Models DJ-1 and DJ-3 airplanes.

From their website DJ-1:
Lenght: 894mm
Wingspan: 1000mm
Wing area: 32 square decimeters
Weight: 1100 to 1200 grams

DJ-3
Lenght:...
Showing results 1 to 25 of 90
 
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