View source for PVD Land Speed Record Bike

==Team McCall USA==
Gordon McCall was put in touch with me through my friend Dan Kyle. Dan is a motorcycle tuner that knew that I knew a lot about building bicycle frames as well as motorcycle science.
see: [http://www.teammccallusa.com Team McCallUSA]

==Previous Record Bike==
[http://www.fredrompelberg.com/ Fred Rompelberg] is the current record holder. 268.831 km/h. 167.044 mph.

This is as close a scetch of Fred's bike that I could make from photographic details. The wheels are about 22 inches in diameter.<br>
[[Image:Rompelberg-bike.gif]]<br>


==The Chasis==
The frame will be constructed of 4130 tubing. The goal is to make the bike as light as possible, as stable as possible, as fast as possible, and most importantly AS SAFE AS POSSIBLE.

At speeds over 170mph, the forces going through the frame are huge even on apparently smooth surfaces.

At this point, the bike is going to have front suspension and a solid rear for maximum power transmission. The tire in the rear will be doing most of the work.

===Rough Print for Team McCall USA Bike===

===Tubing Choices===
Special tubes avalable:
*True Temper Tandem Boom Tube, F1-TDBT, 2.125 x 1.375 Oval x 0.9mm Wall x 692mm Long ($32.40 from Henry James)
*[http://www.fairing.com/Reynolds.asp?subcat=reynolds&subreynolds=525 Reynolds 525] Tandem Base Tube, KC120, 1.968 (50mm) x 0.984 (25mm) Oval x 0.035 (0.9mm) Wall x 760mm Long
*[http://www.fairing.com/Reynolds.asp?subcat=reynolds&subreynolds=525 Reynolds 525] Tandem Base Tube, KC111, 1.500 (38.1mm) Round x 0.039 (1.0mm) Wall x 760mm Long
*Reynolds 853 BX2709, 34mm x 28mm Oval x 650mm Long, 7/5/7 Butted
*Reynolds 853 BX2805, 34mm x 28mm Opposed Oval x 635mm Long, 7/5/7 Butted
*Columbus Cyclex, TCMA22, 48mm x 28mm Oval x 1.2mm wall x 680mm Long.

===The Dropouts===
In house design, watejet cut from .3125 4130 Cro-mo.

It has not been decided if the rear wheel postion will be fixed or adjustable.

==Weights==
Weights:
* Front Wheel - 12.30 lbs (tires - 6.25 lbs, rims - 6.05 lbs)
* Rear Wheel - 12.30 lbs
* Left Fork Leg - 6.05 lbs
* Right Fork Leg - 6.05 lbs
* Front Rotor - 3.60 lbs
* Front Caliper - 1.60 lbs
* Front Master - 0.90 lbs

Total weight of what you gave me - 42.80 lbs.

Lets say we can shave a pound of weight from each wheel, then we are down to 40.80 lbs.

My estimate of the additional parts:

* Triple clamp and steerer - 3.50 lbs.
* Head Bearings - 0.50 lbs
* Axles - 0.75 lbs
* Stem, Seat, Seatpost, Handlebars, Grips, Front Cranks, Front BB, Pedals - 5.50 lbs.
* Sprocket adapter to rear wheel - 0.75 lbs
* Double/Triple Reduction Gearing, Spindles, and Chain - 4.00 lbs
* Steering Damper - 1.00 lbs
* Paint and Decals - 0.50 lbs.

16.50 additional pounds (very rough estimate).

That brings us to 57.30 lbs BEFORE I even add the frame which will probably be at least 12 lbs.

I am very concerned about the amount of energy required to accelerate a 70 lb bike.

Some decisions really have to be made. I'm really thinking about this right now. I'm looking for the eureaka moment.

==The Wheels==
===Rims & Hubs===
[http://www.marchesiniwheels.com/ENG Marchesini] 125 GP forged magnesium Wheels, 2.50”x17”, 63.5mm x 431.8mm

The current record bike used 18" diameter rims.

One concept is to lace some downhill bicycle hubs to some [http://www.rk-excel.co.jp/english/rim/customwide.pdf Excel] 2.50x17" alloy rims with either 32 (XS32U, EFS32U) or 36 (XS36U, EFS36U)holes. Larger sized bicycle spokes could be used to save weight and using a radial lacing pattern.

[http://www.rkexcelamerica.com/ RK-Excel USA]<br>
Claimed rim weight - 4.0 lbs

The spokes could be [http://www.dtswiss.com/Products/Components/Spokes/DT-champion-black.aspx DT Champion 2.34mm] spokes.

also, 12 gauge, 2.6mm, 0.104" spokes from [http://www.central-wheel.co.uk/cwc/spoke_details/spoke_details.html Central wheel]

Then the issue is to make a safe tubeless conversion.

===The Tires===
[http://www.dunlopracing.com Donlop Tires] is helping us with some killer rubber. We really need to use the fastest hardest rubber that they have available. We also need to use the smallest tire.

The current record bike used tires with a diameter of 20.4 inches on 18 inch rims.

<br>

KR149<br>
(125cc slicks)<br>
95/70x17<br>

6.25 lbs.

C-Medium Compound

Rim Range - 2.15-2.5"<br>
Recomended rim - 2.5"<br>
Max width - 3.46"/88mm<br>
Max Diameter - 22.68"/576mm<br>
Suggested Roadrace psi - 25-27<br>


I wish that we could find something that was a lower profile, like the rain tire but with hard compound and slick.

KR122<br>
Compound- WA<br>
Max Width - 3.45"/88mm<br>
Max Diameter - 22.64/575mm
<br>

The tires will probably need to be shaved to reduce contact patch and to save grams.

Tires should be W (168mph) or Y (186mph) rated.

==The Front End==
===The Fork Legs===
Ohlins 125 GP gas fork

Top clamp diameter - 1.771"
Lower clamp diameter - 1.888"
Min top of clamps distances - 5.500"
Max OAL clamp distances - 9.125"
Lower range 3.750"
Upper range - 1.500"

Axle clamp diameter - 1.100"
Axle clamp width - 1.500"
Axle clamp seems on center with slider.

options: 
* [http://www.foxracingshox.com/fox_bicycle/bike_index.htm Fox] 40, 6.83lbs
* [http://www.marzocchi.com/Template/detailSPAForksMTB.asp?IDFolder=208&LN=UK&Sito=usa%2Dmtb&IDAnno=55897&mCO=Prgho%5ChduPrgho%5Chdu%23GHVF%2F%23VhulhRuglqh%2F%23weoRjjhwwl1LGRjjhwwr&mCW=DQG%23%26Prgho%5ChduPrgho%5Chdu%26%23A%40%23%2A5334%2A%23DQG%23%26DP%26%23%40%234%23DQG%23%26Prgho%5Chdu%26%23%40%2388%3B%3C%3A&mCJ=&IDOggetto=56163 Marzocchi] 888, 6.98 lbs
* [http://www.sram.com/en/rockshox/downhill/boxxer/#tab1 Rock Shox] Boxxer, 6.2lbs

===The Yoke===
A special lightweight yoke is going to be required. The goal is to have a 1.125" steerer extention so that different stems can be redily avalable for rider position adjustment. I think that this makes sence.

[http://www.risseracing.com/product_accessories.shtml#Fox40 Risse Racing] (not contacted yet). 1.5" offset.

If not available, then [http://www.dkg-cnc.com/index.html DKG]

or [http://www.hanebrink.net/about/index.html Dan Hanebrink], [http://american-boardtracker.com/ this] link may work better.

===The Headstock & Bearings===
The larger the headstock the better. Current bicycle technologies are durable and light. The [http://www.canecreek.com/double_x_flush.html Cane Creek Double XC 1.5" Flush] headset should maximize the headstock area.<br>
[[Image:Cane Creek 1point5 flush.jpg]]<br>
[[Image:Park 758-S 1point5 cutter.jpg]]<br>
[[Image:Park 750 1point5 cone.jpg]]<br>

==The Brakes==

too big and heavy

Brembo 125 GP

16x18 Radial brake master cylinder for single caliper 

155mm rotor front?


==The Drivetrain==
===Gearing===
A reduction of 19.5 to 20 times reduction will be needed to get the bike over record speed at 130rpm crank speed.

The current world record bike used double reduction gearing, 70/13 teeth & 60/15 teeth, an overall reduction of about 21.5 and 114.2 ft of development. The bike used tires mounted on 18" rims with an overall diameter of 20.4 inches.

To match the current record on the wheels that have been selected at 130 crank rpm, we will need twin 70/16 reductions. Twin 74/17 comes quite close, but comes just short. It's obvious that some refinement is needed here. Breaking the record will require a slightly taller gear.

The rear wheel will be spinning approximately 2500 rpm. Front crank 130 rpm. Jack shaft, 570 rpm.


===Double or Triple Reduction===
A triple reduction with a front [http://www.whiteind.com/ENO-free-specs.html freewheel] can use 53/19-53/19-53/21 for a 19.64 reduction.

A double reduction will require a 65/14-65/15 for a 20.12 reduction. (65 tooth rings are available)

Or if custom rings are made, then 76/17-76/17 for a 19.98 reduction

The triple reduction chain wraps 1231 degrees per crank rotation. (but the added weight and drag from the additional drivetrain reduces the effiecincy of this option considerably.

The double reduction with the 65 tooth rings is a little less efficient since the chain wraps 1267 degrees per crank rotation.

The double reduction with the 76 tooth rings is much more efficient than either of these options with 1088 degrees of wrap per crank rotation. About 14% more effiecient due to chain friction.

So, Custom rings must be made with 76 or more teeth.

===Cranks===

177.5mm Cranks may be goal. Difficult.

*2008 Dura-Ace Track cranks - ? 144 BCD, 175mm
*2008 Truvative [http://www.sram.com/en/truvativ/specialtycranksets/omnium/omnium.php Omnium Cranks] w/ Ceramic Bearings. 144 BCD, avaliable up to 180mm length
*FSA [http://road.fullspeedahead.com/fly.aspx?layout=product&taxid=99&pid=238 SLK Tandem] Front 130mm BCD, 175mm, LSD
*Ultegra Tandem Front 130mm BCD, 175mm, LSD
*Miche 1907A - 144 BCD, 175mm

===Jack shaft===
White w/ freewheel
Phil bb

Davinci Double Freewheel Block. How about a single? LSD.

===Chainrings===
Paragon, Phil Wood, or White.

A better choice could be [http://www.highpath.net/cycles/eggs/01.html Highpath Engineering]

[http://www.mdt-products.co.uk/products/259_ovalchainrings/index.htm MDT] does ovals as customs. These run in the $500 each range.

http://www.rotorcranks.com/s1-q-rings.shtml

[http://www.easystreetrecumbents.com/stuff/chainrings.html 65 tooth 130mm chainring]

[http://www.schlumpf.ch/schlumpf_engl.htm Schlumph]


144 BCD to match the Dura-ace track cranks. 5/16-3/8" thick.

===Freewheel===
[http://www.whiteind.com/ENO-free-specs.html White Industries] - LSD?
17 teeth is a minimum for high speed drive systems.

===Fixed Cogs===
Phil Wood. If they can do LSD fixed, then things will fall into place.

17 teeth is a minimum for high speed drive systems.

===Chain===
Bushing or bushinless?

400 series chain?

Bushingless 8spd Dura-ace chain or bushingless 10spd Dura-ace?

The chain will be moving at 21651.5 inches per minute at record speeds. That is 1804.3 ft./min.
  
Centrifugal pull = (chain weight per foot x (fpm)^2)/115,900   
Total chain tension = working load + cenrifugal pull   
   
Generic 25 series chain weight - 0.9 lbs per foot.

[http://www.izumichain.co.jp/en/ Izumi Chain Mfg. Ltd.] - 1/2 x 1/8 Izumi V or Izumi 25-2 or Izumi 25T-2 motorcycle chain (9.01 kN Tensile Strength)

[http://www.kmcchain.com.tw/index.php?ln=en&fn=find&mo=view&id=653 KMC Devil D101] - Titanium Nitride. light and strong.

KMC Kool K710SL - TiN, KMC USA 909-392-2045



===Other Details===

At 13 inch spacing between a 74 tooth ring and a 16 tooth ring, the included chain angle will be 41.5 degrees, a wrap angle of 138.5 degrees. 120 degrees is considered the minimum for any roller chain drive. The planned gearing range should be sufficient.

[[Image:Chainring-angles.gif]]<br>
Where P is the pitch of the chain, and N is the number of teeth on the sprocket; 

Pitch Diameter = Chain Pitch / Sin (180/Teeth)

Outside Diameter = P × (0.6 + cot ( 180° ÷ N) ) 

Sprocket thickness = 0.93 × Roller Width - 0.006"

Maximum Pitch = (900 ÷ rpm )^2/3

==Ceramic Bearings==

Expected cost - $600 for both wheels, $300 for both bottom brackets.

[http://www.endurobearings.com/ Enduro]

[http://www.woodcraft-cfm.com/Scripts/prodList.asp?idCategory=12660 Woodcraft]

[http://www.bocabearings.com/ Boca Bearing]

[http://www.cbrbearing.com/ CBR Bearing]

==Testing==
==Record Attempt==
The record attempt will be made at Bonneville or Edwards Airforce Base.

==Research Links==

*[https://www.rbracing-rsr.com/bonneville2.htm Mike Geokan's Harley thing]
*[http://www.canosoarus.com/08LSRbicycle/LSR%20Bike01.htm Howard bike]
*[http://sandsmachine.com/bp_hsk.htm Skip Hujsak]
*[http://www.f1elites.com/forums/index.php?s=1a72b56e0a4ea183d9e42e9c701d97fe&act=Attach&type=post&id=379]
*[http://www.recumbents.com/wisil/speedruns2000/worlds-fastest-bicycle-2000.htm]

[[category:Bicycle]]
[[category:Frame Building]]