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Nov 09, 2012, 09:42 AM
DX5e fatal flaw- PM me!!!!
Oh, and my crosswind landings today were horrible! I haven't gotten back in the groove enough after an enforced break from flying to be able to focus on the finer points of keeping it over my narrow runway.
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Nov 09, 2012, 07:34 PM
222 km/hr Parkjet flyer
solentlife's Avatar
Quote:
Originally Posted by HoosierGuy
How to eliminate landing bounce? Land the right way - on its belly!
Dang !! wanted to say that !!!! I was going to post " Remove the wheels ! "

Nov 09, 2012, 07:51 PM
222 km/hr Parkjet flyer
solentlife's Avatar
Quote:
Originally Posted by CNY_Dave
Oh, and my crosswind landings today were horrible! I haven't gotten back in the groove enough after an enforced break from flying to be able to focus on the finer points of keeping it over my narrow runway.
No doubt you saw my other post about donating a runway to my flying pals ... 25m long by 1.4m wide ... Now that will take some practice to land on !! Take-offs - that's fine ... but boy is that 1.4m narrow when on finals !

Nigel
Nov 12, 2012, 09:50 AM
DX5e fatal flaw- PM me!!!!
Mine isn't that narrow, but it does seem wide when there's no crosswind.

Also an issue is that 75% of the runway is 'below-grade' a bit, so if you are aimed at the sides at all you need to decide to put it down hard or power-up and climb a bit just to get above-grade.
Nov 12, 2012, 04:07 PM
Seeking time to fly
macchp's Avatar
Quote:
Originally Posted by David Hipperson
.....

Sorry to ask but what stage are you at in your flying? Do you have an instructor or are you going it alone? If really in the primary stage are you flying on just rudder, elevator, motor or full four channel including ailerons?

.......
sorry for the delay in answering. I've been out few days.
Unfortunately no instructor and limited time to spend at the field where there are mainly heli flyers.
Just started this late August with the planes.
I'm flying with a trainer, Jamara Cub J3, 1 meter wingspan, 3 cells lipo. I can take off, fly all the battery with some looping, large and small turn, and few things more. She has flaperons, rudder, elevator and throttle. Really easy to control and fly. No issue in landing even, a part the bouncing.
Few difficulties more with my other bird, a scratchbuilt Ugly Stick, that after lot of crashes and repairs which let me learn how to fly, is now much less self stable, but even much more fun to control. She's a 90cm wingspan on a 2S, 1400Kv motor and a 10X3,8 prop.

Still, i'm learning really a lot reading here... Thanks
Nov 29, 2012, 10:30 PM
Registered User
flare low enough, land slow enough=
no bounce
Jun 11, 2014, 09:23 AM
Registered User
jamboF4's Avatar
Just land it with a bit more attitude (spelled "slower") Don't make it more complicated than it is. (The ground is arriving before the airplane is ready for it)
Jun 12, 2014, 08:54 AM
Registered User
xmech2k's Avatar
Flaperons. Everyone's gotta have them. Are you using those when landing? I have 3 planes with flaps, let alone flaperons, and with 2 of them I won't even use them if there's even a little wind. The planes will float too much and bounce at landing. The wing loading on most of our models is so light already. The 3rd model is the 8 and a half pound E-flite F -4 Phantom. It needs them.

Most of our planes, and most likely your Cub, don't need flaps or especially flaperons. They can cause more trouble than they're worth.
Jun 12, 2014, 03:03 PM
Built For Comfort
Tepid Pilot's Avatar
I've found the best way to eliminate landing bounce is to release up elevator either at the point of touchdown or just before it.

TP
Jun 15, 2014, 03:33 AM
crash expert
I did my first landings with wheels today!
OK that sounds odd. I have done 4 landings with a Dart XS (no u/c)
then today I maidened my Lazy Bee, got 4 landings in (controlled) The first two had bounce, the second two were perfect. Im not sure what I did except taking it slow and flying itinto the ground.
I did do a lot of approaches at 6 feet and 3 feet, some were non intentional (too high or too fast on approach).

However I did it! Thanks for the advice on this thread!
Last edited by felixx; Jun 15, 2014 at 03:34 AM. Reason: edit: Im no expert I have landed 8 times on purpose and about 15 times by accident!
Jun 15, 2014, 08:15 AM
Registered User
1. After I realized I was having many crashes due to stalling during the landing, I did some heavy studying of what was happening. I was mainly crashing when I was landing at an angle to the left/right of the runway due to a cross wind. Since normal depth perception is only about 17 feet, and I always landed further than 17 feet away, I suddenly realized that when I landed at an angle I did not know where the plane was in height, relative to the runway, since I did not know how far away it was. In addition, when I land at an angle, I completely lose my sense of "rate of decent" (I don't know how fast/slow I am approaching the ground). Furthermore, with the plane coming in at an angle, I completely lose my sense of ground speed of the plane. I addition, coming in at angle completely destroys my sense of "angle of flare" because of the geometry of what I am seeing. I searched for a solution and this is what I do now: I only land right-to-left or left-to-right. If the crosswind is terrible I will point the nose a little into the wind. On every landing, I do my best to touch down directly in front of me as I am facing directly across the runway (at a right angle to the runway length). By landing in front of me, I have a better and constant view of the plane attitude, ground speed, rate of decent, and flare angle. For those that wish to point out that the plane cares nothing about ground speed, only air speed, I point out that we fly our planes without the instrumentation to know air speed, and instead substitute other input to arrive at a safe landing.
Apr 18, 2017, 01:27 PM
Registered User
sirlordwhitman's Avatar
I tried greasing this one in.
Im thinking lack of flare in combination with badly designed gear.
E-DO Model F-4 Phantom on 4S (4 min 37 sec)
Apr 18, 2017, 03:07 PM
An itch?. Scratch build.
eflightray's Avatar
I think there may be two types of 'bounce', though both are probably linked.

1. The springy undercarriage, that tends to 'bounce' the model back up if the landing is heavy.

2. A change in wing angle of attack, (AOA), creating a sudden increase in lift.
This one is more for those models that sit on the ground with the wing at a higher than normal in flight AOA, such as the tail dragger, plus some trikes where the model sits with a positive AOA.

If the tail drops while the model is still near a 'flying' speed at touch down, the lift will increase from the increase in AOA, and will 'lift' the model off the ground, looking like a bounce occured.
The same thing can happen with a trike if the nose leg is too long, and makes the wing sit at a positive angle with all three wheels on the ground.

The cure ?, is probably more to do with landing speed.


This is one of my embarrassing 'bounces'. There is no U/C, other than the fixed wheels in the wing pods, (normal A-10 retracted position), so this wasn't a case of springy U/C legs. This was purely a case of the AOA increasing, in my opinion. The model did sit at a positive AOA on the ground, ..... until I lengthened the tail skid and solved the bounce.

A-10 Thunderbolt.wmv (4 min 29 sec)



The link between 1. and 2. ?, if the bounce causes an increase in AOA, ( a model will rarely bounce up level), then the bounce get exaggerated.

Ray (I hate that landing ).
Apr 23, 2017, 09:25 AM
Registered User
Low wing, very light, soft springy tail dragger undercarriage and dead stick.
Petiterina landings (0 min 39 sec)

As others have said constant slow approach directly into wind, flair close to the ground, the wind shear reduces the air speed close to stall speed, increasing up elevator to maintain lift in the ground effect reaching full up by the time the wheels (all 3!) are on the ground.
Takes quite a bit of eye/hand coordination to get it right every time so its practise, practise, practise!


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