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Old Feb 21, 2007, 05:22 AM
where are our jetpacks!
lenniegordo's Avatar
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Joined Sep 2005
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Stingray (fanfold stryker copy)

I love flying my Parkzone stryker. Okay it's no high brow model. It's a thrash and bash ugly bird. That's why I like it, it never took much effort to keep it in the air. There little you can do wrong with it, since it's almost impossible to stall.

My Strykers looking a little run down now so I thought I would look for a "simple" foam fan fold plan, and build something similar. But I could not find a set of plans that suited my needs. So I came up with my own and built it out of 3mm foam.

It turned out great, and flies better than the stryker. I don't have scales but I reckon it's about half the weight of the stryker, so it's allot quicker and more nimble

Anyway here are some pics and if anyone want's to see plans and build pics just say so, and I'll post them.

(sorry for bad spelling. I've taken time to check it it's just not a strong point of mine)
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Last edited by lenniegordo; Oct 01, 2007 at 03:36 AM. Reason: Updating attachments
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Old Feb 21, 2007, 05:36 AM
where are our jetpacks!
lenniegordo's Avatar
Ballarat
Joined Sep 2005
244 Posts
Build Pics and Bulid instructions

You will need

* 100cm x 60cm x .3cm foam board
* 3 x 40cm x .3cm carbon fiber rods or similar
* Hot glue gun and glue
* Motor mount and some balsa or ply
* a sharp hobby knife, pen and ruler
* radio gear , 2x Servos and mixer
* some creativity

Building The Wing

1. Cut a piece of 3mm foam to 100cm by 40cm
(make sure it’s square)

2 Find the center line and mark out the pattern with a pen (you won’t see this as it’s all covered up)

3. Turn the foam up-side-down and mark the center line and fold lines on it. Run some clear packing tape down the fold lines to help the folding process, don’t forget to mark your CG

4 Turn the foam back over and cut out the red hashed section on the plan.

5. Glue in your carbon rods and motor mount.

6. Score the fold lines with a pen, then do another two scores about 3mm apart on either side of the fold line.

7. Run a bead of hot glue down the score Line and then using a ruler fold the foam and hold it down evenly at the leading edge - look closely at the picture. Allow it to create a natural airfoil. Do the same on the other side and then glue them down on the trading edge making sure the airfoil is symmetrical.

8. Make Two cuts where the 2 green dotted lines are.

9. Cut out the black hashed sections on the plans (the fin slots only need to go through the top layer) and cut out the elevens and hinge with some packing tape

10. Cut out your fins and glue then in. You will need to glue two together to make a 6mm fin or if you have 6mm foam use that (you can make them any shape you like ).

Building Fuselage

Install your gear and build your fuse.
Look at the build pics for ideas on this as I don’t have plans for the fuse, you can be as creative as you like. Just make sure you preserve some if not all of the symmetrical airfoil. Don’t forget the air intakes.


My Power set up

Mega 3000kv in runner on a 5x5 inch prop
1300mha 20c lipo with a 25amp esc

Wing span 78cm or 30inch
Total weight 450g or 14oz
Total static thrust 720g or 25oz
Power to weight ratio 1.6 to 1 ... zooom!



Launching the bird

CG: In the Plans I have the CG set at 19.5cm. this is conservative, I have my CG at 20cm as my calculations say that's the optimum, but 19.5cm is better for a maiden. the stingray is verry sensitive at 20.5cm it will become almost uncontrollable.

Since there is no feathering on the wing you may need to trim the elevons up 10%, hold it at a 30% angle apply about 40% power and give a light toss.
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Last edited by lenniegordo; Apr 26, 2012 at 08:11 AM. Reason: Update
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Old Feb 21, 2007, 05:52 AM
Time for another motto!
Utrecht, The Netherlands
Joined Jul 2006
1,413 Posts
Looking good Lenny!
Not as quick and simple as a JSW, but should be a quick build nonetheless. I wonder, why didn't you make a thisrd arm to the innner frame to the motor? No you have a separate motorstick with a lot of balsa(? yuk) to give it something to hold on to.
I am not familiar with the stryker, what are the dimensions on this one?
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Old Feb 21, 2007, 06:32 AM
I make this look hard!!!!
Greenville, WI
Joined Jan 2007
70 Posts
Very good looking bird! Design seems simple enough. I think I will have to add it to my LONG list of things to build...Look forward to the plans.
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Old Feb 21, 2007, 06:56 AM
where are our jetpacks!
lenniegordo's Avatar
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Joined Sep 2005
244 Posts
JelleB, the stryker is a parkzone, hight speed RTF trainer
http://www.modelflight.com.au/hobbyz...27_stryker.htm
# Wing Span: 37 in (950mm)
# Overall Length: 27 in (700mm)
# Flying Weight: 21 oz (580g)
# Motor Size: 480 Power Direct Drive

I never had the RTF so can't tell you how it flys I just got the body parts and put my own gear in it

Yes the balsa and motorstick are crude, but the stick on the bottom gives me something to hold on to when launching, good point though, I could put it in side and then make nice hand grip.... yes I think I will do that next time I rebuild it
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Old Feb 21, 2007, 07:19 AM
Time for another motto!
Utrecht, The Netherlands
Joined Jul 2006
1,413 Posts
No need for a bottom handhold, I have no trouble lanching my JSW discus-style. It helps that it has about 1.4:1 power to weight ratio...
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Old Feb 21, 2007, 07:19 AM
You deserve my opinion
FirstShirt's Avatar
Collierville, TN
Joined Apr 2005
1,497 Posts
Wow! That is a nice lookin bird! Great job! I'd love to see your plans.

Spelling? Hey, anyone who can only spell a word one way isn't very creative!
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Old Feb 21, 2007, 11:44 AM
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Joined Jul 2006
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Plan

If you get some plans together I would like to add them to my list of must builds.

Pete
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Old Feb 21, 2007, 02:11 PM
where are our jetpacks!
lenniegordo's Avatar
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Joined Sep 2005
244 Posts
yep plans comming. I was puting them togeather last night but we had a power falure
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Old Feb 22, 2007, 12:33 AM
where are our jetpacks!
lenniegordo's Avatar
Ballarat
Joined Sep 2005
244 Posts
I have uploaded a pdf of the plans, decals and added instructions to the build pics,

You may notice 2 things that are contradicted in the instruction compared to the build pics. so you can benifiting from my mistakes they are

1. I cut out the fin slots before I folded (not a good idea)
2. I put the motor mount on the bottom both ways will work but I gues inside would have been nicer.

enjoy
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Last edited by lenniegordo; Feb 22, 2007 at 12:55 AM.
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Old Feb 22, 2007, 01:20 AM
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Joined Mar 2006
170 Posts
nice job!

ive been waiting for something like this
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Old Feb 22, 2007, 01:38 AM
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nÝtterÝy, NORWAY
Joined Mar 2006
1,171 Posts
So cool..
Really like the fast and simple construction!
Thanks for the plans by the way.

Kim
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Old Feb 22, 2007, 03:36 AM
where are our jetpacks!
lenniegordo's Avatar
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Joined Sep 2005
244 Posts
fast and simple, yet nice to look at was the idea.
I don't mesure build time in hours but rather beers, this was a 3 beer build

Thanks for the positive feed back!
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Old Feb 22, 2007, 10:19 AM
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Grafton, Ohio
Joined Sep 2003
760 Posts
Outstanding design and compared to what they are asking these days for these simple foamy arfs....very economical!!! Thanks!
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Old Feb 22, 2007, 12:59 PM
I make this look hard!!!!
Greenville, WI
Joined Jan 2007
70 Posts
Lennie - any details on the canopy? did you yank that off of a different plane?
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