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Author: Subject: OffAxis Oblique Buggy Build
van


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Registered: 8-22-2006
Location: sugarland-richmond Texas
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Mood: ride ! ride ! ride !

[*] posted on 7-20-2016 at 09:18 PM


One of my buddies told me about this thread so I was curious and took a look. I didn't read thru all the replies but I kind have an idea what is going on. Let me summarized by thoughts on this thread in a few short and concise points.

1) It is great to want to build your own buggy if you want the experience and the bragging rights to say that you made it yourself.
2) It is cheaper to buy a starter buggy then build one. Custom buggy .. that's totally different.
3) Copying one of the worst buggy ever built ( Peter Lynn) just set you back years in buggy design. Yes, it was the best thing since sliced bread in the 90's. But it's 2016.
4) No matter how much engineering you learned in school , it will never equal experience. Engineering doesn't tell you things like needing correct back support if you don't have abs of steel.

I started building buggies years ago because I wanted to build a better mouse trap. If you've seen my older threads you will see my crazy ideas of a single sided front fork .. that' didn't work.. lol.

After 3 years of building buggies on the weekends , I stopped building buggies on a regular basis and only do it here and there on my spare time. I probably have about 30 VTT buggies out there ( Cricket, Black Widow and Stinger Race ). Why did I stop? Cost. If I wanted to maintain the quality, I have to raise the price to keep selling. I was loosing money making these buggies. I've spent over $25K in tools to build these buggies and they weren't paying for themselves. If you do it right, it will cost money. If you can build it cheap .. I guarantee you that you will spend more time on the beach fixing that buggy while others are out riding.

OffAxis, feel free to email me or give me a call if you need help with your build. Folks on this site know I am always open to any questions. I don't keep any secrets about my designs or what I learn. Always happy to share.




US-00 ( That\'s right baby .. double O!!)
Engines:
8m charger, 10m Scorpion, 15m phantom, 19m venom, 5m npw9, 8m npw-ha, 9m switchblade , 14m Ozone Catalyst



Rides:
VTT Black Widow, VTT Stinger Race, Flexboardz Haize, Trampa , Spleene HT Door 59, MTH custom twin tip



713-499-0100
http://www.shopvtt.com
http://www.vantantech.com
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soliver


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Location: Marietta, GA
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[*] posted on 7-20-2016 at 10:12 PM


listen to Van... He is the man!

I had many many email and text exchanges, even phone conversations with him over the process of my work on his buggies... He is very willing and to talk and share his experience.... A VERY valuable asset for you as you move forward!




NAPKA US 593
In real life they call me "Spencer"

Flying-- Flysurfer: 6m Peak 1 (A Minty Fresh generous gift) & 12m Peak 2 (The gnat fart catcher)
Riding-- VTT Stinger-XR Hybrid & PL XR Frankenbuggy
Current PB-- 28.5 mph,... MAN THAT'S FAST!!!
JWC-- Founding member and self appointed president

Allow yourself to be moved by that which cannot be seen.

She blogs about scrapbooking,... what a nerd.
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OffAxis


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Registered: 2-23-2016
Location: Central PA
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[*] posted on 7-21-2016 at 04:52 AM


Van, thanks for the insight brother! I'm sure I get in touch with you eventually. The design is not locked into the PL buggy, it was just a frame of reference as a starting point. With all the feedback I have been receiving, I have been iterating the design. I have been super busy lately and haven't found the time to keep working on the model but there's no rush.

I just got back from what is probably the best rc flying event ever. http://flitefest.com/. It's like a huge family reunion. Lots of crazy planes were built crashed and built again. Records were broken. Also lots of fun and fellowship with friends we see once a year!

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van


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Registered: 8-22-2006
Location: sugarland-richmond Texas
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[*] posted on 7-21-2016 at 11:57 AM


Great .. that's good to hear. It is good to keep an open mind. I changed my buggy design many, many times ... I learned alot from others on this forum also. I learned from their success and I learned from their mistakes. Most of my design are not original , yes I've talked to other builders and borrowed a few ideas here and there. Why do you think all the high end buggies look the same?? We find the features that work and incorporate them and throw out the ones that don't work.



US-00 ( That\'s right baby .. double O!!)
Engines:
8m charger, 10m Scorpion, 15m phantom, 19m venom, 5m npw9, 8m npw-ha, 9m switchblade , 14m Ozone Catalyst



Rides:
VTT Black Widow, VTT Stinger Race, Flexboardz Haize, Trampa , Spleene HT Door 59, MTH custom twin tip



713-499-0100
http://www.shopvtt.com
http://www.vantantech.com
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Bladerunner


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Registered: 10-17-2006
Location: Vancouver
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[*] posted on 7-23-2016 at 09:18 AM


Save whatever money you have for the build and make sure you get to WBB!

There will be all sorts of buggy designs there to pull inspiration from. Like the RC group you will be among friends who want to share what they know and encourage you. Or at least send you home on a more clear path.

You have never really replied to what you have for pilot skills and kites? 90% of this game is kite control. An engineering degree ( or even pilots licence :) ) can't give you that.

Notice how even Van suggests that you are better off getting a basic starter buggy and building from there. If you listen to ANYBODY, listen to Van. He has been through exactly what you are trying to do.




Kites: 2.5m Profoil , 4.9m QuadrifoilXL kitesurfer, 9m Flexi Blade II, NPW 5 Danger.
Flysurfer : 19m Speed 2 SA, 7m Pulse
Peter Lynn :18m Phantom, 15m Synergy, 10m Synergy, 1200 Farc, 460 Sarc, 130 Tarc, 5m Peel, 4.2m , 6.4, 8.5 C-Quads

Rides: Flexi / P.L. Frankin'Buggy , Shaped + straight skiis, sand skis, Coyote blades. Core 95 ATB. RKB R2 ATB .

Ken (K2)
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abkayak


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Location: a.b. NY
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[*] posted on 7-23-2016 at 12:06 PM


Yea you should build after WW...come have a look/see



US-31...Cquad set/ 2.6 Viper/ 2.9m Reactor/ 3.3 Soulfly/ 3.5m Lobster Foil/ 3.5m Bullet/ 4m RMSD 2 line Special/ 4m Ikon dp/ 4.9m Blade/ 5.6 Twister/ 6.6m Blade/ 7.3 Frenzy/ 7.5 Apex/ 9m Fuel/ 13m Pulse/ Phantom I 9,12,15,18/ MBS Core 8&16/ Flexboard Haise/ 2 Flexibugs/ PL Comp XR/ PL Big Foot
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OffAxis


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[*] posted on 1-20-2017 at 10:52 PM
Design reboot....


Welp, after busting out a rim on my kite trike I've decided to rework the design and get more serious about building a better buggy. The kite trike will then hitch as a tandem to this buggy when needed. Here's what I've come up with for general shape and fit. My wife laughed at me sitting on the floor measuring out what I think would be ideal buggy size for me.

Here are the specs:
Me: 5'10", 175lbs, 32in waist, ~38in chest.

Oh, you were expecting buggy specs...:

Material: Plain Carbon Steel
Tires: Midi (16/6.5-8) or Barrow wheels
Axle Dia.: 20mm all around
Length (Axle to axle): 66in. max, 51in min.
Axle Width: 57.5in.
Trail: 2in, 3.125in, or 3.9in
Head Angle: 65deg
Seat Back Angle: 60deg
Seat Base Angle: 15deg
Rear Axle Tube Dia.: 1.5in sch40 pipe
Seat Frame Tube Dia.: 1_1/4in sch40 pipe
Fork Width: 8.7in
Fork Tube size: 1in sch40 pipe
Neck Tube size: 2.5in sq. x .120in tube
Sheet metal parts: .250in or .3125in
Frame Weight: ~65lbs
Est. Total Weight: 100-110lbs

Rear axle adjustment length: 7in, 1 in increments
Neck Adjustment length: 8in
Seat position from front axle: 41in max, 33in min
Seat position from rear: 25in max, 18in min
Seat Clearance height: 7in
Seat Back height: 15in
Seat Width: 16.5in
Seat bottom length (back rest to clamp): 16in
Foot peg height: 8.9in to 11.8 from ground.

Comments: I won't always be riding on a beach, so I think a good amount of ground clearance is better. Maybe I should add some fork angle adjustment into the clamp design. I need to clean up the fork design and decide on a the fork bearing setup yet. Also need to add hitch point to the rear axle.


The lines shown in the picture represent the seat and body position at max chassis length.


Question to you all: How much adjustment is necessary to be able to dial in the buggy to achieve the proper tow point. The neck adjustment allows for setting the proper length between the seat and pegs, which also messes with your Center of gravity and tow point. To compensate for this change I've added the feature of being able to slide the axle forwards or back to help compensate for setting proper center of gravity and tow point. Is this feature necessary? I fully expect that once the buggy sets off on the maiden voyage, the neck and axle location would be adjusted as necessary then probably never adjusted again.

I have the seat 3in in front of the centroid of the triangle formed by the tires. The centroid should be close to the center of gravity of the buggy. From my reading, people recommend the back tires breaking loose first, so I bumped the seat forward a bit to keep the weight a bit forward. Let me know if this is bogus thinking and the seat should be located near the midpoint between the front and rear axle.

Let me know what you guys think.




PL Venom II 16m, HQ Apex III 7.5m, Pansh Flux 2m & 4m
MBS Sol 16 ATB, Kite Trike
Blake - US35

With much blessing comes great responsibility.

Snowkiting: The time of the year when the landscape around me turns into a huge playground.
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