Foamie Resurrection
Great example of repairing a crashed foamie by Plane Chaos:
http://www.rcgroups.com/forums/showp...postcount=8285
http://www.rcgroups.com/forums/showp...postcount=8292
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http://www.rcgroups.com/forums/showp...postcount=8285
http://www.rcgroups.com/forums/showp...postcount=8292
...Continue Reading
Miniature surveillance helicopters help protect front line troops
Discussion /
Posted by Gerry__ /
Feb 04, 2013 @ 02:34 PM / 1,964 Views /
7 Comments
Aerodynamic Arguments.
When people think they know what they're talking about, but actually, they don't.
http://www.rcgroups.com/forums/showt...0#post21912847
http://www.rcgroups.com/forums/showt...0#post19565450
http://www.rcgroups.com/forums/showt...0#post17413895
http://www.rcgroups.com/forums/showt...0#post21989740
http://www.rcgroups.com/forums/showt...0#post21912847
http://www.rcgroups.com/forums/showt...0#post19565450
http://www.rcgroups.com/forums/showt...0#post17413895
http://www.rcgroups.com/forums/showt...0#post21989740
Quote:
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Originally Posted by ggunners
For an example, assume 10 mph airplane stall speed and 5 mph wind speed.
If 1/2 throttle provides 10mph in calm air and we're heading into the 5mph wind, the airplane is performing with 15mph "air" speed. When you turn 90degrees, your speed becomes 10mph "air" speed as the wind speed effect is zero on the "air" speed. When you turn downwind, your "air" speed becomes 5mph, 10 mph from the 1/2 throttle and -5 from the wind. In this case, you would need to advance the throttle enough to yield an additional +5mph to net 10mph air speed. You are correct in that the airplane only cares about "air" speed. It does not know or care about wind speed or ground speed, only the combined amount of "air" going over the wing. -- ggunners |
Parkzone Spitfire Mk. IX
I had the second flight on mine yesterday. Wind was about 5 -10mph, so only just inside my comfort zone.
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Hobbyking Mosquito
I've just purchased a Hobbyking Mosquito. 
Parkzone P-51 Restoration
I've just picked up an old P-15 for a fiver at a boot sale:[IMG]
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How To Prolong The Life of Your LiPo Batteries
Nice article about lipo management by George Worley, of www.4-Max.co.uk: http://www.4-max.co.uk/pdf/prolong-life-lipo.pdf
Alfa Mig-15
Nearly five years after purchase and I finitely got my Alfa Mig-15 ready to maiden! Anyway, reviewed this thread:
http://www.rcgroups.com/forums/showthread.php?t=720677 for best way to maiden and went for a ROG.
No problem:
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http://www.rcgroups.com/forums/showthread.php?t=720677 for best way to maiden and went for a ROG.
No problem:
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The Downwind Turn
The idea of turning from upwind to downwind is something that often confuses model and full scale pilots alike. It has also been know to confuse the CAA (Civil Aviation Authority).
In this excellent article by a well renowned South African instructor, all is explained.
http://www.avcom.co.za/phpBB3/viewtopic.php?f=9&t=61963 but you are required to register to view.
http://www.gbfs.co.za/images/Dragons.pdf
In this excellent article by a well renowned South African instructor, all is explained.
http://www.avcom.co.za/phpBB3/viewtopic.php?f=9&t=61963 but you are required to register to view.
http://www.gbfs.co.za/images/Dragons.pdf
Best Beginner Plane?
This often asked question will generally boil down to a choice between the Mupltiplex EasyStar (EZ*) and the Graupner Electro Rookie.
Well, I think the Rookie is better than the EZ* in pretty much every way and with that in mind I offer these objective Rookie plus points:
1. the wings have a much better designed interlocking arrangement.
2. The canopy is much more secure.
3. The cockpit is bigger and more easily accessible.
4. The tail is detachable.
5. The model fits back in its own box for ease of transport.
6. The kit comes with a brushless motor and ESC as standard.
7. Power is easily upgraded by adding a 3s lipo.
8. There is an integrated ballast system.
9. Ballast is included with the kit.
10. The battery secures without need for velcro.
11. The fuse is re-enforced with a carbon rod.
12. You get two props supplied. One for 3s and one for 2s.
13. Raised CoG points moulded into the wings.
Personally I think the Rookie handles much better than the EasyStar too.
Rookie thread: http://www.rcgroups.com/forums/showthread.php?t=1269117
Latest EasyStar thread: http://www.rcgroups.com/forums/showt...=1363621&pp=30
Both are fine planes and will serve any beginner well, but I believe that the Rookie is of a significantly better design that offers a much better pathway into the hobby than the EZ*
Well, I think the Rookie is better than the EZ* in pretty much every way and with that in mind I offer these objective Rookie plus points:
1. the wings have a much better designed interlocking arrangement.
2. The canopy is much more secure.
3. The cockpit is bigger and more easily accessible.
4. The tail is detachable.
5. The model fits back in its own box for ease of transport.
6. The kit comes with a brushless motor and ESC as standard.
7. Power is easily upgraded by adding a 3s lipo.
8. There is an integrated ballast system.
9. Ballast is included with the kit.
10. The battery secures without need for velcro.
11. The fuse is re-enforced with a carbon rod.
12. You get two props supplied. One for 3s and one for 2s.
13. Raised CoG points moulded into the wings.
Personally I think the Rookie handles much better than the EasyStar too.
Rookie thread: http://www.rcgroups.com/forums/showthread.php?t=1269117
Latest EasyStar thread: http://www.rcgroups.com/forums/showt...=1363621&pp=30
Both are fine planes and will serve any beginner well, but I believe that the Rookie is of a significantly better design that offers a much better pathway into the hobby than the EZ*
The effect of wind on the aircraft in flight
http://www.bmfa.org/publications/fil...02FullBook.zip
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Quote:
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BRIEFING 3 - THE EFFECT OF WIND ON THE AIRCRAFT IN FLIGHT There is probably more nonsense talked and written on this subject than any other connected with the practical side of flying! In reality, the matter is very simple - it is just that so many people find it hard to accept. Provided that your flying area is clear of vertical obstructions (houses, trees, hedges, hangers etc.) the wind will blow fairly steadily from a constant direction once the aircraft is above about 50ft. Below this height, and depending on the surface of your flying site and the proximity of obstructions, there will be some turbulence both vertical and lateral. Once you understand this principle you will see that a turn from an into wind heading to crosswind will appear to be a fairly sharp turn when seen from the ground and a turn from downwind to crosswind will appear to be slow and elongated. You must accept these visual effects for what they are and remember at all times that if you have not altered your throttle setting and the aircraft is at constant height then your airspeed is constant and the aircraft is in no danger of stalling. Once the aircraft has climbed out of this turbulent level it is, in effect, flying in a steadily-moving block of air. Thus, with a windspeed of 10 mph the block of air in which your aircraft is flying is moving downwind at a speed of 10 mph. So, your aircraft which |
