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Schedule cool-down breaks for the brakes. If you stop with the brakes very hot, never leave the parking 
brake on for a long period of time because the brake drums can permanently warp as they cool. 
With centre steering (steering via a central steering column), both front wheel brakes are controlled 
via a brake lever. 
With tank- steering (planned), the front wheel brakes are controlled separately: left brake lever for the 
left front wheel, right brake lever for the right front wheel. 

When  braking,  always  apply  both  brake  levers  (for  the  left  and  right  front  wheel)  so  that  you  can 
develop the full braking effect and the vehicle does not change its direction. 

Familiarize yourself with the braking characteristics of the Bülk MK1 and the braking distances by 
performing braking exercises in a safe place. 

Like every tricycle, the Bülk MK1 must always be secured against rolling away: this can be done with 
one or more parking brakes (clamp toggle for central steering, clamping bracket for tank-steering). Be 
aware that when you are loading or entering the vehicle, braking may be insufficient on a downhill 
slope. If the parking brake is no longer effective, this is a sign that the brake cables must be readjusted. 

It  can  also  happen  that  the  Bülk  MK1  is  parked  in  a  very  windy  place  and  is  moved  by  the  wind. 
Unoccupied, the Bülk MK1 is a very light vehicle and offers the wind a large surface to attack. 

 

4.2 Steering 

 

With centre steering, the Bülk MK1 is steered by turning the steering column; tilting to the side or 
swivelling the steering column forwards has no effect on the steering. 
With tank steering using the steering levers on the front wheel housing, it is in principle possible to 
steer with one lever, but note that in braking situations both hands are needed to operate the left and 
right brakes. 
  
The chassis is designed in such a way that very little steering effort is required when driving. 
Accordingly, the steering levers are lightweight. Do not steer when the vehicle is stationary and never 
use force when steering to avoid damaging the steering system. 
The  steering  angle  is  limited  by  the  laterally  closed  front  wheel  housing  (this  is  necessary  for 
aerodynamic reasons). Therefore, drive with  foresight  and turn in  early on tight  bends.  It  is  best  to 
practice cornering on an area where there is no traffic. If you turn hard when manoeuvring, the front 
wheels will rub against the fairing. This is easy to hear and gives the driver a signal not to turn further. 
Again, do not use force when steering. 

 

4.3 Cornering 

 

The  Bülk  MK1  is  a  three-track  vehicle  with  a  relatively  small  track  width.  It  behaves  completely 
differently in curves than a normal bicycle and can tip over to the side if the curve speed is too high in 
conjunction with unfavourable steering behaviour on the part of the driver. Therefore, approach these 
properties slowly and get to know the curve properties through practice. If the wheel on the inside of 
the curve lifts in curves, you should immediately counter steer accordingly so that the vehicle does not 
tip over. This is often not possible (especially in right-hand bends), especially when oncoming traffic 
doesn't allow it. Therefore, avoid such situations at all costs and adjust your speed. 
In principle, caution is advised on slippery roads, as the rear wheel can break out if corners are taken 
too quickly. This can be the case with black ice, leaves or wet conditions. 

Summary of Contents for Bulk MK1

Page 1: ...d vehicles 4 3 While driving 5 4 Information on the special features of the vehicle 5 4 1 Brakes 5 4 2 Steering 6 4 3 Cornering 6 4 4 Speed 7 4 5 Lighting 7 4 6 Body 7 4 7 Behaviour in traffic 7 4 8 L...

Page 2: ...seat 12 5 7 1 Basic settings 12 5 7 2 Quick settings 13 5 8 Correct setting of the tiller cable 13 6 Hoods and lids 13 6 1 Foam combi lid 13 6 2 Hood for daily use with moped visor 14 6 3 Racehood 14...

Page 3: ...carefully and to follow them The B lk MK1 has like velomobiles in general some special riding characteristics that are not known from normal bicycles and that can lead to dangerous situations if the r...

Page 4: ...t should never be less than 6 mm The end of the trailing arm which leads through the wheel housing should definitely be screwed on with a self locking nut and have a sufficient thread protruding The c...

Page 5: ...y e g because you shifted while stationary the chain can jam with the rear derailleur and cause damage Stop the backward movement immediately if you feel resistance or hear a suspicious noise Since th...

Page 6: ...g using the steering levers on the front wheel housing it is in principle possible to steer with one lever but note that in braking situations both hands are needed to operate the left and right brake...

Page 7: ...rly visible in traffic 4 6 Body With the B lk MK1 the body takes on a supporting function and is not only responsible for wind and weather protection However so that the body can be built as lightly a...

Page 8: ...t feel any pressure while riding but the distance to your shoulders is no more than about 1 cm 4 10 The tiller cable The steel cable with which the steering column tiller is adjusted in its inclinatio...

Page 9: ...aching them as obliquely as possible Do not under any circumstances drive over deadlocks at high speed Potholes can also lead to bottoming Feel your way towards these conditions 4 14 Boarding and dise...

Page 10: ...with the visor becomes too poor you should open the visor a little 5 Maintenance and Self Help The wear on the drive components is significantly lower than on a normal bicycle This is because the chai...

Page 11: ...en these elastomeric rubbers are worn out they must be replaced Sometimes simply tightening the screw connection is enough The important thing here is that the screw connection must not be tightened t...

Page 12: ...oft pad and secured against each other so that they cannot tip over The support points should be chosen so that the stiffened parts of the B lk are supported so that the body does not buckle Remove lu...

Page 13: ...ated behind the seat so that it fits the head position in the head rest adapter The head should neither be looking too far into the sky poor vision with varifocals nor should it be bent too far forwar...

Page 14: ...hen the inlet will open When you push the actuator back up you close it again Under no circumstances should you try to open it by turning the actuator The actuator may only be pulled or pushed otherwi...

Page 15: ...chapter 5 7 Here are the approximate sizes again Persons from 145 165 cm choose the adapter small Persons from 165 180 cm choose the adapter medium People over 180 cm usually do not need an adapter a...

Page 16: ...cause then they will be pushed out of your ideal line and the drive will no longer run efficiently The chain then rubs in the chain tube With the carbon cover you can avoid this and use the space behi...

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