Anatomy of the Stream­liner

Motorcycle News (UK) - - Features -

1. En­gines

Two three-cylin­der Tri­umph Rocket en­gines with re­duced ca­pac­ity from 2294cc to 1485cc, to meet the 3000cc limit for the record at­tempt. They’ve short­ened the stroke to re­duce the ca­pac­ity of each en­gine, which in-turn al­lows the en­gines to rev higher and pro­duce more power – kick­ing out 1000bhp+ at 9000rpm. Each mo­tor has a sep­a­rate Gar­rett tur­bocharger, cus­tom pis­tons, ti­ta­nium rods and spe­cial­ist cams, valves and re­tain­ers.

2. Ex­haust

Each en­gine has its own stain­less steel di­rect ex­haust. To keep each ex­haust cool, the head­ers are in­jected with a fine spray of wa­ter to re­duce the im­mense heat. In­side the en­gine bay is ba­si­cally like a sealed oven there­fore the ex­hausts are coated to re­duce the heat as much as pos­si­ble.

3. Wheels

The wheels are spe­cial­ist one-off items made by Matt Mark­staller’s team. The riv­ets around the outer wheel are there to se­cure the bead­ing of the spe­cial­ist Goodyear tyres. Each slick is spe­cially made for the record at­tempt, and runs at 150psi in the front and 120psi in the rear. The front has a cus­tom hub­cen­tre steer­ing sys­tem, with the rear be­ing a more con­ven­tional swingarm with no link­age.

4. Sus­pen­sion

The front has three TTX36 Öh­lins shocks, which are all fully ad­justable, each one set iden­ti­cally with around three inches of sus­pen­sion travel. The rear boasts two TTX36 shocks. The team ad­mit they haven’t re­ally played around with the set­tings; Guy just jumps in and wants to get on with it.

5. Body

The body­work isn’t just for show, it’s a car­bon-kevlar mono­coque chas­sis spe­cially de­signed for the job. The idea is to keep the bike as stream­lined as pos­si­ble but to also make it sta­ble. The rea­son it’s so long is to clean the air tur­bu­lence as it leaves the bike. The outer rear fins aren’t ad­justable and are again they are there to smooth out the air­flow. Mark­staller’s back­ground is aero­dy­nam­ics, and the team have spent count­less hours in the wind tun­nel mak­ing the bike as slip­pery as pos­si­ble. Even the ex­haust gasses have been ac­counted for, this is why they exit low to­wards the rear to cause as lit­tle tur­bu­lence as pos­si­ble.

6. Cock­pit

The main dash is by Motec and not only con­trols ev­ery­thing but is also used to col­lect data. It shows speed in mph with rev in­di­ca­tion lights across the top. Be­cause of its hub steer­ing there aren’t any con­ven­tional bars – Guy just pulls the left joy­stick to turn left and vice-versa. The ac­tual grips/bars are an air­craft de­sign. The right-hand joy­stick con­trols the throt­tle, while the rear brake is un­der Guy’s right foot. The push-but­ton gear changes are on the left bar; the but­tons on the right bar are to kill the mo­tor. Each of the two en­gines are started sep­a­rately via but­tons on the dash. The levers where you’d ex­pect to find the brake and clutch are to de­ploy the parachutes and sta­bilis­ers for stop­ping. There’s also a fire ex­tin­guisher switch on the left side, just in case. There is no clutch, so the 400mph Stream­liner is more like a scooter. FIM rules state Guy must be able to un­clip the 7-point har­ness and es­cape in un­der 30 sec­onds.

7. Stop­ping

There’s no front brake – all the brak­ing is done by the rear car­bon brake and two parachutes. Once Guy wants to stop he will pull the first para­chute, which is smaller and starts to slow the bike from 400mph, then he will pull the larger para­chute for more brak­ing then fi­nally ap­ply­ing the rear brake at around 250mph. There’s a built-in slip­per clutch to re­duce en­gine brak­ing.

8. En­gine cool­ing

Each en­gine is wa­ter-cooled, how­ever the ra­di­a­tors are not cooled by di­rect air like on a con­ven­tional bike, as this would cre­ate drag and tur­bu­lence. In­stead each ra­di­a­tor sits in a ‘wa­ter bath’ which is lo­cated un­der the main chas­sis, each one con­tains five gal­lons of cool­ing fluid. At the end of the run, while the team turn the bike around, they empty and re-fill the baths with fresh ice-cold wa­ter, whilst they repack the new parachutes.

9. Fuel

The bike is pow­ered by pure methanol. It will use around four gal­lons per run, with each run tak­ing just one minute, and the bike is only on the throt­tle for around six miles. All this equates to roughly 1.5 miles per gal­lon. For the last five miles of a run Guy is only try­ing to stop, so the Stream­liner doesn’t re­ally use fuel. Good job, re­ally...

The Rules

The Bon­neville Salt Flat course is around 12 miles long. Guy will ac­cel­er­ate briskly with a five-mile run up to a timed mile sec­tion where Guy will break a tim­ing light beam, then break an­other a mea­sured mile later. He then has five miles to slow down and turn around be­fore run­ning in the op­po­site di­rec­tion. He has to run back in un­der two hours and again break both beams to record an av­er­age speed over the mile. The of­fi­cial record is the av­er­age speed over the two runs, not the peak speed of the bike.

Clever Motec dash is straight from a su­per­bike

Gar­rett tur­bocharg­ers boost each en­gine’s power

Not one but two heav­ily mod­i­fied Rocket III en­gines

Who needs brakes when you’ve got parachutes?

Newspapers in English

Newspapers from UK

© PressReader. All rights reserved.