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Author Topic: Tip Launch to Jalvelin Launch Conversion  (Read 613 times)
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rekit
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« on: May 05, 2020, 11:21:36 AM »

Hi Gang,

I've been out of FF for 5 or 6 years now. Many age-related health issues.

I was thinking about getting back into hand launch, and had an idea that might compensate for my needs.

Tip launch is out due to heart-med-induced vertigo. Catapult is out since I can't see small planes very well. (I also need to stay away from anything other than a simple build for the same reason.)

I was thinking about javelin launching a large tip launch model...just for fun, not competition or any serious performance goal.

How would you alter the design of an existing tip launch glider for hand chuck? I would think the tail feather configuration and trim scheme would be the main issues.

Edit: Also, right hand launch with left hand glide, with standard transition at the top.

Thoughts?

Thanks,

Rekit
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Sundance12
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« Reply #1 on: May 05, 2020, 11:56:48 AM »

I propose a Supersweep hand launched glider, found in the gallery. 26 to 30 inch version built to 25 grams if able.

Cheers

Bruce F.
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rekit
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« Reply #2 on: May 05, 2020, 01:03:56 PM »

Do you mean a scale blow up of the 22" plan?

Thanks...
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Tmat
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« Reply #3 on: May 05, 2020, 01:26:01 PM »

Rekit,
Are you aware that you do not need to spin around to launch a Tip Launch Glider?
Many people launch them with a simple flick motion with spinning around.
I'd suggest looking at Stan Buddenbohm's Cole Power model which plan was in one of the latest NFFS Digest. It's small (24") and can be built without DT for fun flying at a schoolyard. Or Lee Hine's Sweepette 28 (28" span). Lee launched that without a spin quite well! The pan is probably here in the gallery.

Tmat
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« Reply #4 on: May 05, 2020, 01:36:29 PM »

Sweepette30 is in the plan Gallery. Very good model.
Cole Pwer plan was in the November/December NFFS Digest. Article on page 16.
Plan or kit can be ordered from Stan www.amaglider.com


Tmat
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« Reply #5 on: May 05, 2020, 01:50:47 PM »

The Cole Power plan is available from www.amaglider.com
https://amaglider.com/static/outdoor-handlaunch/cole-power-20191021.pdf

By the way, why would a Catapult Glider be a more complicated build? You can literally glue a plywood hook onto any old Hand Launch Glider and turn it into a Catapult.
Easy.
Also, to answer your original question, a TLG can be hand launched. Just change all of the trim isntructions to the opposite of a right hand launch. That way it can launch to the right and glide to the left.

Tmat
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rekit
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« Reply #6 on: May 05, 2020, 02:44:19 PM »

"Catapult is out since I can't see small planes very well"

I meant when they are airborne!


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ptlove
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« Reply #7 on: May 05, 2020, 04:29:34 PM »

Rekit, if you want to diverge from standard (contest-legal) practice, you can take hand launch of whatever size you like for visibility, add a hook (a little further back than you would for regular catapult), and use a super size ground mounted elastic band to launch it.   I've used 20 feet of 1/4 inch rubber (doubled over to make it 10 feet), and 10 feet of string, attached together for a total length of 20 feet.  Stake it to the ground with a 12 inch stick, walk back until you like the stretch, and let it go.   Great fun!  I did this with a smaller glider:  https://www.youtube.com/watch?v=v-S7AUijpUI
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Tmat
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« Reply #8 on: May 27, 2020, 11:59:53 AM »

"Catapult is out since I can't see small planes very well"
I meant when they are airborne!
I see. Well, I have flown a 24" catapult glider very successfully. And you can always use more rubber than "legal" (like two loops of 1/4" for example) and launch a large catapult to satisfying heights.

Tmat
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« Reply #9 on: November 16, 2020, 09:20:56 AM »

Another thought on the issue.  Build a simple 24"+ span glider and use a hi start to launch it.  The only modification needed would be the addition of a towhook.  For something in the range of 24"-36" wingspan, a 25 foot length of 1/16" rubber and 75 feet of braided fishing line would work. 

Chris
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dosco
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« Reply #10 on: November 16, 2020, 10:17:41 AM »

Go with something larger and more -ahem- "energetic" catapult launch methods ... like the Catastophic or Banzai Machine.

Dave Linstrum's Catastrophic: https://outerzone.co.uk/plan_details.asp?ID=11035

Banzai Machine: https://outerzone.co.uk/plan_details.asp?ID=10610

Frankly, if you were to build either of these, why not add a micro RC receiver, a small battery, and a micro servo?

-Dave
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lincoln
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« Reply #11 on: November 18, 2020, 03:41:14 AM »

If you're going for a powerful catapult launch with a large model, it may be best if no one is in front of you! Especially if the model isn't trimmed quite right.
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