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Old Jan 14, 2009, 07:37 PM
Shade Tree Aviation #2
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United States, NC, Rutherfordton
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Tiburon Bipe v2 Indoor Version

It has been a few years since I introduced the original Tiburon Bipe. Recently I began thinking about revisiting the design and incorporating some changes to bring the design up to date in turns of it's performance and construction style. This version is intended for indoor flying specifically.

The original Tiburon Bipe was constructed from 6mm Depron with a 30" wingspan. Like many of the foamies of the time, it was designed around an inrunner brushless motor on a gearbox. The version that was (and i assume still is) kitted by 3D Foamy used a carbon tube and "G-force" doublers on the wings for rigidity. This seamed like a feather in it's day, but is a bit overkill by today's standards.

The 6mm Tiburon was followed by a 24" wingspan - mini version built from 3mm & 2mm Depron. It flew well on 2s battery with an Axi 2204/54. It was really my first indoor airplane - and I flew a bunch of them.

So, here are the major adaptations on the V.2. This version is constructed from all 3mm Depron and has a 33" wingspan. Rigidity comes from 1mm carbon rods bracing the wings and stabilizer. Foam longerons run the length of the fuse preventing twist. The tail moment has been lengthened from the original design to improve precision "F3P" flying ability. The wings are not staggered as in the original. I found that on the original, upright harriers were a piece of cake while inverted was a bit more difficult. The distance between the wings has also been increased. The wing struts have been converted to rather substantial "Side Force Generators". Wing, Stab, and Rudder shapes have been tweaked along with slight fuse alterations. Design will include airbrakes between the wings to aid in constant speed through downline manuvers. The design retains the unique look it is known for while bringing it up to date for today's flying style.

I will keep you posted as I begin construction and flight testing. Here is a look at what I have so far...
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Old Jan 14, 2009, 08:06 PM
For us He died, in me He lives
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United States, MI, Saint Clair Shores
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Looking forward developements on this one. Looks to be the start of a sweet bipe. Don't keep us waiting for too long!

Jimmy
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Old Jan 14, 2009, 08:32 PM
Shade Tree Aviation #2
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United States, NC, Rutherfordton
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Jimmy,

Hopefully construction can begin soon. I have submitted laser cut files for a quote. Shouldn't be long before they can send me some parts! I am just too busy to handcut all those lightening holes!

Matt
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Old Jan 14, 2009, 08:53 PM
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So did you design the TIB too? I flew the poo outta one this summer. Fly buddy giggled everytime he saw the tail twist. I did have to modify it a bit for lighter power system, FFF, etc...Pull/pull and all the goodies. Loved how it would blender to the ground then shoot straight up forever. I learned most of the good 3d moves on that one. The only bad trait was wing rock at slow and low.
Any chance of a redo?

I actually have the original tib bipe plans rolled up. I gave up trying to align them correctly. Probably printer settings?

Dan

P.S. This new one already looks like a good candidate for an outdoor version. The span's perfect. Just have to see what ya come up with.

Mind if I build one off this drawing?
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Old Jan 15, 2009, 07:08 AM
Shade Tree Aviation #2
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Dan,

Yes, I designed the Tiburon monoplane as well. It did suffer from a bit of tail twist, especially with the massive torque of the motor's I ran on it.

Feel free to build away...The pdf. drawing is 25% scale.

Matt
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Old Jan 15, 2009, 07:53 PM
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Matt,

Thanks, I might scale it to 28 or so and give it a go.
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Old Jan 16, 2009, 08:04 AM
Shade Tree Aviation #2
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Let me know how it turns out...
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Old Jan 16, 2009, 08:20 AM
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United States, MI, Saint Clair Shores
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Hey Matt,
If ya don't mind, I'm going to print it out too & try it as the 24" mini.

I really can't afford really good brushless motor's atm but will probably get a cheapy for now from Hobby City. Any particular motor you would recommend going that route for the time being?
I currently have the 1300 kv 20g blue wonder that pushes 400g's. That will be going on the Blu Baby highwinger of Tony's.
That little brute of a motor is so silly cheap. (yes I know you get what you pay for )

What do you think?

Jimmy
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Old Jan 16, 2009, 02:29 PM
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If you are going to scale it down to 24" you are definately going 2s and I would suggest something along the lines of the Axi 2203/46 or the Hacker A10 series. www.gobrushless.com has a couple of motors you might want to look at as well. My guess is that you are looking at around 5-6.5 ozs rtf at that size.

Matt
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Old Jan 16, 2009, 02:39 PM
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United States, MI, Saint Clair Shores
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Matt, thanks for the link.

I looked at that link. I swear I am not going to get anything done hear at work
In particular the 5 & 10 g 2k+kv motors found under the Micro Motors RTR. Think 1 of those would be sufficient?
Being a newb is such a pain!

What would you recommend for servo's?

ah heck, why dont I cut to the chase and skip the next 5 questions & just ask...
what set up would you put on this if you were building this plane at 24" and had to be frugal about it?

Jimmy
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Old Jan 16, 2009, 07:21 PM
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United States, NC, Rutherfordton
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Cheap @ reliable - go with the Eflite 250 outrunner with an 8amp esc.
2 cell 350 mAh Li-po
servos - I like the Futaba 3114 (I have had great results with them).

Just my suggestions, many others would work well also.

Matt
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Old Jan 16, 2009, 08:05 PM
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United States, MI, Saint Clair Shores
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Matt,
I checked out E-Flite's website. Still too high in terms of price for my budget. That 250 outrunner starts at $45.00. When I said cheap, I meant cheap, as in some off shoot from Hobby City maybe. One of the Blue Wonders?

Being a newb is a pain in the butt, being a poor newb (with high aspirations no less) is way worse!!!

Any suggestion?

Jimmy
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Old Jan 16, 2009, 08:57 PM
Shade Tree Aviation #2
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Jimmy,

Look for a motor weight of 14 grams with a kv of around 1700-2000.

Matt
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Old Jan 16, 2009, 09:06 PM
14s 180mah should be enough...
IFLYOS's Avatar
United States, NC, Pfafftown
Joined Feb 2001
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http://www.bphobbies.com/view.asp?id...7&pid=B2171399

Thats the motor you need...chaep, reliable, and good price!!

It's over 14 grams, but for the money, you cannot beat it. I have a couple of them as well as a few Park 250's...and both have their place....

If you build light, you might be able to make up the difference in weight...

Tim
AG4RZ
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Old Jan 16, 2009, 09:31 PM
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United States, MI, Saint Clair Shores
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Tim,
I looked at your motor & it looks pretty sweet. Can you do me a favor & compare it to ths guy?
http://www.hobbycity.com/hobbycity/s...idProduct=2069

This is the motor I currently have. It's actual weight, according to the scale I have, is 20 g's. Brand new, $8.00.

Brushless Outrunner Motor.
Kv - 1300rpm/v
Max Load: 7.5A
No Load Current: 0.7A
Suggested Lipo: 3 cell 11.1v
Thrust: 400g+
Suggested Prop: 8x3.8
Weight: 20g

Jimmy
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