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Apr 27, 2017, 12:36 PM
Outlaw
gatorb8's Avatar
lookin good!
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Apr 27, 2017, 02:18 PM
Tavares, Fl - Winter
Quote:
Originally Posted by birdofplay
Here is my latest iteration of the SlowBoat 3DPrinted Motor Mount.

Weighs less than 19 grams yet takes nearly an hour to Print.
It will be interesting to see it mounted and a couple of flights on it. Are you using PLA or another stronger plastic? I suspect PLA would work fine though.

Looks good.
Apr 27, 2017, 04:02 PM
Registered User
What adhesive do you plan on using to stick it to the foam?
A lot of plastics don't glue very well - and some that do the solvent will attack foam.
Apr 27, 2017, 06:37 PM
Retired CAD guy
birdofplay's Avatar
Guys, Thanx for comments.

Concerns always need to raised during development..

I generally use the Gorilla fast set which foams up to fill in .
With all the lightening holes I suppose even Hot melt would work.

The 3D printings are generally rough on the surfaces so there is plenty of
what some older guys refer to a "Tooth" .
Yes it's PLA.
I haven't experimened with ABS et al types much
since I am really new to this 3D Printer stuff.

Not much different than rougher plywood surfaces.
This motor mount has lots of surface on TOP as well as the Sides
so I am not expecting any bonding issues.
But, I suppose ya never know until you try it.

More later.

I just finished all the parts printing for the Spitfire 3D Printed model from 3dlabs in CZ.
I am amazed at the quality and strength of the assy.
ref: https://3dlabprint.com/shop/
Do watch some of his vids just for the fun and amazement

As you can see I am going in about a zillion directions all at the same time.

Seems like there are ALWAYS too many models to build and so little time.
Apr 27, 2017, 07:00 PM
DLG addict.
electrich's Avatar
Quote:
Originally Posted by Yachtie04
What adhesive do you plan on using to stick it to the foam?
A lot of plastics don't glue very well - and some that do the solvent will attack foam.
Epoxy would be my choice.
May 10, 2017, 09:00 AM
Home of "Golf Cart Flying"
pecanpatch's Avatar
Colton Clark......... from 2015 SEFF

SlowBoat at SEFF 2015 (0 min 30 sec)
Latest blog entry: Paint shaker!
May 10, 2017, 11:07 AM
Letís eschew obfuscation.
scott swanson's Avatar
Great video. Some impressive flying.

Scott
May 10, 2017, 03:08 PM
DLG addict.
electrich's Avatar
I'll have my Slowboat at Nall next week. Hope to see some others too.
May 10, 2017, 04:14 PM
Home of "Golf Cart Flying"
pecanpatch's Avatar
Ill have mine at Nall
Latest blog entry: Paint shaker!
May 19, 2017, 04:30 PM
Registered User
Well - My attempts to fly my Slow Boat ended in wrecking the plane.
Flew from a friend's small dam.

Got off the water nicely - but was difficult to control once airborne.
Got it trimmed out OK but was still quite unstable in the air and I have absolutely no idea why.

Control surface area was only half shown on the plans - but certainly had plenty of control authority.
The other difference to plan was that the wing was under-cambered - but doubt very much that was a factor?

After several minutes ended up losing control and crashing into the ground hard. I was trying to get it down to land - but lost control about 10 feet from the ground.
All my other planes by comparison are easy to fly. (Blu Baby, BYOB and Lazy Bee)

I won't rebuild - just move on to finishing the other planes I have started building and put it down to experience..
Last edited by Yachtie04; May 19, 2017 at 04:51 PM.
May 19, 2017, 06:54 PM
Retired CAD guy
birdofplay's Avatar
Sorry to hear of your issues.

From the Pic it looks like a very nice build.
The motor angles look OK so it has to be a CG thang, but I'm just guessing.

There's a lot of grass floating on that pond ! ;>}

Bob
May 19, 2017, 07:49 PM
Registered User
Bob - I have been wracking my brains as to what might have caused the instability and yes - I now think that you are probably correct.
The instability was in the rolling axis.
I was using a 1300 mah battery to keep overall weight down since it appears my plane is heavier than a lot of builds. It was balancing on the main spar.

The up-thrust on the motor is exactly as per plan.
The plane has ample power and was flying at half throttle OK

My Blu Baby tended to be a little unstable in a bit of turbulence initially and moving the C/G forward about 4 mm made it a totally different plane to fly - much more stable.

Maybe an under-cambered wing needs the C/G slightly further forward than a flat wing?

On second thoughts I might build a new one down the track sometime to test the theory - but too many other planes half built that need finishing off right now.
Last edited by Yachtie04; May 19, 2017 at 08:03 PM.
May 19, 2017, 09:16 PM
Silly n00b
TuMadre's Avatar
I had to use a 2200 3s to get mine to balance properly. 1300 seems light to me. This thing is a booger to fly tail-heavy.
May 20, 2017, 12:30 AM
Registered User
MISTERSCOTT's Avatar
Hi,
Sorry for the loss.
I use only 1300 3 cells and flys great light.
My guess is the undercamber plus ailerons was giving you too much lift working w/ the pusher thrust angle causing instability. Or something to that affect. Yea, thats it...
The flat wing flys very slow w/flaperons at 20 % down and off for normal speed.
A little hot glue and you will have it back up in a hour.
Good flying,
John
May 20, 2017, 01:15 AM
DLG addict.
electrich's Avatar
Put some more expo in it. If you follow the designer's original plans it flies great. My buddy and I just put 4 1300 3S packs through ours at 1am. What a hoot at Joe Nall!


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