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Nov 20, 2016, 10:38 AM
Retired CAD guy
birdofplay's Avatar
Sticky grass will cause a lot more DIG IN.
I've noticed large differences between the various Club Fields and MY home Runway.

Moist grass is kinda of sticky too

I hope your Hull Bottom is Slippery as can be.

If not use some packing tape or HMW plastic tape
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Nov 20, 2016, 02:31 PM
i can't learn fast enough
Thanks much Bird.
I have several coats of wax on the bottom.
Of course, now it is snowing and very windy, so I will have to wait and try later.
For those of you that have, don't shovel too much, and stay warm
Regards
Terry
Nov 21, 2016, 11:27 PM
Registered User
davereap's Avatar
I think it is down to the initial torque from the motor, pressing the model down on its left side , so it gets more drag from the grass..
mine did it at the start of the video..
Nov 22, 2016, 06:58 AM
i can't learn fast enough
Thanks Dave.
if I offset the mtr in the opposite direction, would that help?
Terry
Nov 23, 2016, 02:10 AM
Registered User
davereap's Avatar
I wouldn't ... it flies fine set straight... thrust lines straight, with the down already built in... ..just be ready with some right aileron or rudder... once it gets sliding speed up there is no problem...

from a hand launch, how does it fly? only adjust if it doesn't fly well.... try power on and power off.. then you can tell if the thrust is off line...
Nov 23, 2016, 07:06 AM
i can't learn fast enough
When I tried the hand launch, it just dove into the ground.
Not enough time to do anything.
That's why I would like it to slide, so I can catch up to it, so to speak.

Thanks
Terry
Nov 23, 2016, 11:23 AM
Registered User
davereap's Avatar
launch it like a V wing... holding the wing and swinging it round and up at about 30 degrees and full throttle... get some height and trim it out

edit for better slide on grass.. use 2" tape covering the bottom of the hull and use some furniture polish on the tape...
mine had no thrust angles other than what is designed in, and shown on the plans..
I set mine with a few degrees of up elevator...
initially it started to swing left, but I must have given rudder as it then went right and took off in a short distance... not much further trimming was needed..
Last edited by davereap; Nov 24, 2016 at 12:59 AM.
Nov 23, 2016, 01:09 PM
i can't learn fast enough
As soon as all this snow goes away, I will give it a try.
Thanks to all for your help and patience.
Terry
Nov 24, 2016, 10:23 AM
Registered User
Jürgen Be's Avatar
Quote:
Originally Posted by Terry Glenn
When I tried the hand launch, it just dove into the ground.
Not enough time to do anything.
That's why I would like it to slide, so I can catch up to it, so to speak.

Thanks
Terry
Be sure to set ele / ail 6mm up in neutral position, don`t change the motor thrustlines,they are configured to work fine once in the air. I see no problem takingg of from water or snow. Gras gives to much drag on a puscherplane, even when it`s dry grass...

Jürgen
Dec 01, 2016, 12:33 AM
Registered User
davereap's Avatar
another video flying from grass.. its nothing special, but it shows the initial digging in at the start.. to get it shifting needed full power and right elevon and/or rudder

The video also shows up the elecam's banding in the blue sky... a camera fault, ..its going to be returned
... ...
.

seajet filmed on elecam 1 (9 min 29 sec)
Last edited by davereap; Dec 19, 2016 at 03:17 AM.
Dec 01, 2016, 01:33 PM
Retired CAD guy
birdofplay's Avatar
Sky gradients are usually SOLID Grey in the UK, aren't they ? ;>}
plus a likelyhood of rain followed by potential rain and of course RAIN !

Slippery Bottoms always beats out tendencies to dig in !
And of course the universal fix is MORE POWER !

Nice flier you have for yourself.

I've been boasting about mine for some time but is just hasn't caught on.
I flew it every day at Joe Nall last Spring.
Plus water event locally and my buddies Pond plus my Slide on ground work.
Between Brexit and Trump maybe the economy will pick up enough
to warrant a few more Sea Jets coming on the scene !
Dec 02, 2016, 08:21 AM
i can't learn fast enough
Dave
That is exactly what mine is doing, only the tail gets much higher.
Weather has now gotten very cold and windy, so it will be awhile.
Thanks for all your efforts and every one's response and help.
Terry
Dec 03, 2016, 04:57 AM
Registered User
davereap's Avatar
The seajet is a lovely flier, so its worth getting it to go off from all surfaces...

make sure you polish the hull so its slippery... I use some cheapo spray polish on a taped hull..
You could also increase the down thrust angle on the motor.... point the motor / airflow higher by a few degrees.. so it reduces the rotation which is pushing the nose down..
Mine digs in at low power, but with full power it gets moving and is then ok..
Last resort make a re-moveable U/C for grass use, with some wheels sat forward of the step...
Last edited by davereap; Dec 03, 2016 at 05:15 AM.
May 18, 2017, 02:06 PM
Lost in the Sky
Richard N's Avatar

Judi Sea Komet


Here are my Judi Sea Jets mixed with some Komet; Sea Komets


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