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Jul 10, 2018, 06:38 PM
I Look, Listen, and Learn
Timbo383's Avatar
Quote:
Originally Posted by ringo42
Can you put a measurement on there for scale?

EDIT: nevermind, I see it is DTFB, so I assume you are using all of the 30" length
100 % scale will fit on two sheets of dtf. Just discovered 138 % will fit on two HK 28 X40 sheets. The drawn lines on the plans are a little squiggly since I'm using a 20 year old program and mouse to draw them.
Also I've done some more adjustments but haven't tested the fitment yet...deleted and reposted the new ones Sunday or Monday night.
Adjustments included moving motor forward a little, increasing the ws...just a little, don't want to add too much and take away the shark look....to hopefully increase lift, and also added a little to the tail h-stab.
Last edited by Timbo383; Jul 10, 2018 at 06:57 PM.
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Jul 10, 2018, 08:33 PM
skumgummi dave
Waiting for your next test flight and report...

Dave-
Jul 10, 2018, 09:14 PM
I Look, Listen, and Learn
Timbo383's Avatar
Quote:
Originally Posted by foamdave
Waiting for your next test flight and report...

Dave-
Well, the curent one is somewhat too light and I have to wait for a calm day for testing. Weather forcast for this week....storms, then some more, followed by even more. Good news is I printed out the updated plans at 138 % to fit the HK foam and I'll have a 4 footer ready hopefully by the time these storms stops and the wind will not much of a problem at the larger size then also. But between work, honey do's, and my inability to stick with just one build it may take a couple of weeks. And maybe I'll get lucky and the adjustments I made will help also with the flight.
Jul 10, 2018, 09:22 PM
I Look, Listen, and Learn
Timbo383's Avatar
I did add a little bit of extensions to the wings for more lift and also shimmed the motor up angle...up, since it is centered on the chord... in hopes to push the nose down. I could be wrong on that one.
Jul 11, 2018, 03:02 PM
skumgummi dave
Timbo:

I meant to ask you what kind of paint you used. I think it looks great.

Dave-
Jul 11, 2018, 05:24 PM
I Look, Listen, and Learn
Timbo383's Avatar
Quote:
Originally Posted by foamdave
Timbo:

I meant to ask you what kind of paint you used. I think it looks great.

Dave-
Thankyou, but honestly, it was very old spray cans that spurted and splattered and gave it that look. It was all accidental. The top half is flat black in large patches, bottom was from a 20 year old car paint can of reddish brown....that one really just barely spurted out...and then I top coated with a light spray of a good can of gloss black. Also, I used up that old flat black can on the initial job, that's why the wing extensions are off color.
Last edited by Timbo383; Jul 11, 2018 at 05:32 PM.
Jul 11, 2018, 11:08 PM
skumgummi dave
Well, It was just what the shark needed. Fancy schmancy! Very shark like...

Dave-
Jul 19, 2018, 12:30 AM
skumgummi dave
Timbo:

Any further progress on the Sharknado?

Dave-
Jul 19, 2018, 07:02 AM
treefinder
springer's Avatar
Very Cool! The tail / rudder is perfect!

While the profile construction makes build simple, and you proved it flys well enough, it would be interesting to make a fuse (sort of like the "universal" fuse of yesteryear) box section, to see if it would behave like a lifting body and help with attitude . The shark profile looks awfully like an airfoil!
Jul 19, 2018, 07:34 AM
I Look, Listen, and Learn
Timbo383's Avatar
No Dave, not really, it's been one of those weeks. Brother had hip replacement surgery, he's doing great but he's bored to death not being at work and limited mobility at home. So I've been spending some free time with him. I did get to test the mini shark with the wing extensions, that was a no go....guessing the swept back hurt, the 4 footer will be according to plans with the fins, wings straight out. I do have the thicker HK foam sitting there with plans taped and cut out ready to do, hopefully this weekend.
Jul 19, 2018, 08:37 PM
I Look, Listen, and Learn
Timbo383's Avatar
Was looking at the plans and decided to do some more changes. Since I'm gonna use a motor on the larger version that can use a 6 inch prop, I decide that I can take advantage of the smaller prop and take some of the surface area off the front. And also I changed the fins/wings again...version 4 added to the 1st page. I'm gonna reprint and use these instead for the 4 footer because I have a "gut" feeling this will be a better flying shark. Now it looks more like a...I guess...tiger shark instead of a great white.
Jul 22, 2018, 08:47 AM
I Look, Listen, and Learn
Timbo383's Avatar
The 138 percent size printout of the top view fit the HK foam perfectly, but the side profile section needed to be angled a little to fit. But it all still fits. Going to use the thicker 10mm foam for the side profile and 5mm for the wing and kfm pieces. I need to make some adjustments for the slot and tab sizes also, since I'm using different sizes of foam.
Jul 23, 2018, 08:43 AM
I Look, Listen, and Learn
Timbo383's Avatar
Got all the pieces cut out.... alot more than the original plans....waiting for the fuse doublers and kfm glued pieces to dry. Then I think after the trimming and sanding I'm gonna try my hand at skinning with paper and glue this weekend to give it a more durable finish (been doing some reading on that....wish me luck.)HK foam is brittle and breaks easily, the small one looks like it's been attacked by other sharks after the testing phases and I know this one will be more prone to breaking. And I know there will still be some testing with the bigger one before most of the issues are sorted.....unless I get extremely lucky.
Last edited by Timbo383; Jul 23, 2018 at 08:56 AM.
Jul 23, 2018, 01:20 PM
skumgummi dave
Cool.
Jul 30, 2018, 03:42 PM
I Look, Listen, and Learn
Timbo383's Avatar
Quote:
Originally Posted by foamdave
Cool.
Family came to visit this weekend so not much got done. Did try my luck with the dollar tree tissue and tight bond glue.... boy, that gets messy....but it just didn't feel tough enough to me. So I'm going with the roll of brown very thin stuff I bought a long time ago for who knows what....I think it's masking paper for painting.


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