The bottom end of this pendulum swings just clear of a thin brass will be twice as great, or 44 ft. per second, thus giving a stopping-distance of Please refer to our The Tapley meter is the most recognised international standard decelerometer, RAF Shawbury ATC and the Central School of Air Traffic Control, EGSH Norwich Airport (formerly RAF Horsham St. m.p.h. In order to obtain a test reading, Many aircraft post WWII would have been fitted with wheel braking systems in advance of road vehicles of the same era. the vehicle's weight will change its speed by 11 m.p.h. Pasted as rich text. The outside wheels were skewed off centre (15 degrees?) Generally speaking, EDUL, RAF Laarbruch, now known as Niederrhein Airport.
during speed change, but in one case the inertia of a mass mounted as a pendulum
Tapley Meter Brake Tester all Instructions Operating Manual & Key Vintage Car. Copyright 2008-2022 PicClick Inc. All Rights Reserved. The stopping distance figures are the outer numbers shown on the dial face while the %g is the inner numbers on dial. A more realistic test would be to obtain the coefficient of friction of the runway by laying down a tyre mark (skid) and use that to calculate the relevant figure. Seller: jjmvbarker (6,658) 100%, 
This gives two sets of figures for Field Standard. Like the vast majority of auctioneers Bonhams charge what is known as a Buyer's Premium. and as such is trusted by many leading government authorities around the world
powerful permanent magnet suspended at one end on anti-friction bearings in a
Ive got a notion that the towed option was driven at a steady speed and the meter mechanism provided resistance to the point where a skid started, that point being the assessment figure that was then announced by ATC. %PDF-1.5
It is a pendulum-type decelerometer especially designed for convenience of use in motor vehicles on the road. You can post now and register later. Listed at low start to get auction moving.
and the brakes applied. Results of Tapley meter tests are accepted as evidence of braking efficiency in Courts of Law throughout the world. braking. 
The pendulum is a powerful permanent magnet and when it moves, a light armature follows its movements exactly. Your link has been automatically embedded. Tapley Meter Brake Tester all Instructions Operating Manual & Key Vintage Car. 
I did mail the maker for instructions of their little model, they mailed it to me. It needs no electrical connections and it's so portable that you can take the Tapley Meter to the vehicle instead of the other way around. however, from 60 m.p.h. Meter numbers TM 15 and TM 16 has a dial face showing Brake Efficiency of 0-100%G and Stopping Distance in Meters from 3.5 to >60, All Tapley Brake Meters are calibrated to UKAS standards (ISO/IEC 17025:2005) with an uncertainty of measurement of 2%g up to 35 degrees of calibration. 
The recommended recertification interval for a Tapley meter is every two years and this is carried out at low cost by us, the manufacturers. therefore be noted after each individual brake application, and by turning the
In both cases, application of the vehicle's
For Motor Cars and Motorcycles a 15% Buyer's Premium is payable on the first 50,000 of the final Hammer Price of each Lot, and 12% on any amount by which the Hammer Price exceeds 50,000. By continuing to use our site you consent to the use of cookies. Good amount of bids. Change). rnixartillery non-magnetic casing which is almost completely filled with a light damping
1 sold, 0 available. Set the lever with the arrow pointing to 'FREE'. Started July 4, 2017, Copyright 2020 - Timera Media liquid. 
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and come to rest. The retardation would only be valid for the vehicle it was used in and potentially would have been different for other vehicles. inc. premium, Yorkshire Event Centre, Collectors' Motor Cars, Motorcycles and Automobilia. This auction is now finished. expressed as a percentage has been explained earlier in this article. Stopping-distance Varies with the Speed. Set test lever with the arrow pointing to 'TEST'. speed, or 22 ft. per second, and as this average speed is maintained for 1.36
12 
number 938151, with floor mount, in wooden case together with test certificates calibrating the instrument for 1964, 66, 68, 70, 76 and 78, and a tyre tread depth gauge. to its own weight, it will lose 22 m.p.h. OVERHAULING 1940. 
Buyer's Premium on all Automobilia lots will adhere to Bonhams group policy: 25% up to 50,000 of hammer price, 20% from 50,001 to 1,000,000 of hammer price, and 12% on the balance thereafter. Mark Ellis For payment information please refer to the sale catalogue. The whole mechanism is mounted in a casing carried on pivots which incorporate a fine adjustment so that the casing can be set level before a test. 
document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); RNAS Arbroath HMS Condor and HMS Condor 2, EGCC Manchester (Ringway) Airport ATC, Manchester sub-ACC, PATCRU, Barton Hall, Preston Air Traffic Control Centre (now with early RAF at Barton Hall too), EGGP Liverpool (Speke) Terminal and Tower, EGHI Southampton (Eastleigh) Airport tower, Duxford, EGSU formerly and famously RAF Duxford, Christchurch Aerodrome, Dorset Control Tower. I have a Tapley still in the box; I think the instructions are in the lid. any change of speed of a vehicle in horizontal motion is that a force equal to
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chart that, for a given braking performance, shopping-distance increases as the
If you have queries about lots purchased in this auction, please contact customer services. Release the wing screws and set the scale to 'level'. It is accurate and robustly constructed to give long operational life. endobj
inertia instrument can be equally satisfactorily used on a gradient, the
Surveyor VAT at the standard rate is payable on the Premium by all Buyers, unless otherwise stated. Tapley Brake Meter is a small, self-contained, portable decelerometer that provides a quick and reliable way of testing brake safety and efficiency without the expense and bother of pulling wheels. 
pendulum deflects from the vertical and, providing the speed changes at constant and cookie policies for more information. Brake meters consist of a light p~per scale, a low friction mechanism and an oil sealed damping box and although designed for use in workshop conditions, must be sent to an approved certifier for an annual test and calibration as per New Zealand Land Transport Safety Authority regulations. long, or 2.72 secs., but in addition the average speed during the stopping-time Tapley Meter, Brake Tester all Instructions Operating Manual & Key Vintage CarSee all photos for condition and what is available.I have shown an illustration showing what appears to be a vintage car of 1920's era. Both your and the Aldergrove comments refreshed my brain cell. Ive just searched mu meter caa and tapley meter caa which give access to more detail. Faith), RAF Gibraltar, now Gibraltar Airport LXGB, its out of our area but -a cute Antipodean runway caravan/mobile tower, EGBP Cotswold Airport, formerly RAF Kemble, EGJJ Jersey control tower, Channel Islands, Air Traffic Control Evaluation Unit, later Air Traffic Management Development Centre), Bournemouth Airport.
distance. 
vehicle which is either stationary or moving at constant speed will, of course,
as evidence of braking efficiency in Courts of Law throughout the world. instrument so that the marks at the side of the window coincide with zero, or
A similar reading should now be taken from a lower speed using the handbrake only.
towed system hooked onto a fire vehicle and the AFS had taken over the role. I suppose the Tapley was as good as could be expected. Instructions on how to use a Tapley portable brake meter. In the area where the red and green strip is broken the brakes are average or below, and should be considered ready for some kind of attention, and unsafe for fast driving. The Ferret (Mk 1-5) stopping distances should be in the Inspection Standards EMER WHEELED VEHICLES V 628 Part 2 Base Inspection Standard - Road testing. as in each case the free mass adopts a new position which depends directly on
The Tapley meter has been a recognized international standard decelerometer for almost 100 years and is certified to a standard agreed by the National Physical Laboratory in the U.K. The (civil) School of Air Traffic Control, Bournemouth Hurn Airport 1948-62, EGMC Southend Airport (formerly RFC later RAF Rochford). Place the brake meter on the level section of the vehicle floor.
The vehicle is then driven along the level road at about 20 miles per hour, and the brakes fully applied by means of the foot brake pedal only. Mu meter was a 3 wheel device tower behind a vehicle at 40 mph. I remember carrying out Mu meter readings at Birmingham. 3 0 obj <>>> vehicle travelling at 30 m.p.h. From what I can recall, we used something similar if not the same. Does anybody have the definitive instructions, an example of how the readings were set out in NOTAMs, and a confirmation of the type we used in the UK? brakes disturbs the attitude of repose of the pendulum or the column of liquid What is meant by These lots will be clearly marked with the relevant symbol printed beside the lot number in the catalogue. Simple to operate and needs very little operator training. times as great, and this again depends upon the facts already stated. at a speed of at least 15 mph (20 mph recommended). G force is always shown in %G. The meaning of this brake-performance figure Perhaps the best-known instrument of It will be seen from any braking above 15 m.p.h. Powered by Invision Community. endobj For general use the instrument indicates by means of a coloured strip the normally accepted view of brake safety by the Police Force. Readily transportable weighing only 10kg complete with its protective casing. I have read, understood and agree to Bonhams. (44 feet per second) is braked by a force equal A freely suspended pendulum in a mounting terminating in a quick-acting clamp, and all that is needed is to clamp The armature is connected through instrument gearing to a Clive's figures suggest my memory may be faulty and it could be 30 mph, not 20 mph, which now I think about it sounds right. donegalpatrol You cannot paste images directly. at Aldergrove we used one as shown in the photo, in the front passenger foot well of a precarious old Hillman Husky. always correctly represented by the tangent of the angle to which the pendulum inside the casing. 4 0 obj Later we gave three ratings, one for each third for the runway over the R/T. Paste as plain text instead,
We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. It is functional but is without instructions. The vehicle being tested must be driven
OK, the dial on the meter itself says from 20mph level road so I'll keep an open mind for now. W9Zh\)wRV%([I1GG ^u-O ][.5% ]y%W0)`^5P:zcnDl1{H 60i#~%bEhn[BzRn'N{2CaLv;g`AX 
There is no dating in any of the items.There is no "Buy it Now" price. 
secs, the stopping-distance will be 30 ft. For the same brake performance,
On obtaining the 'LEVEL' position, finger tightens both wing screws. I only have Part 1, I'll look tomorrow in the meantime someone may come up with the figures from Part 2. Also, and this really is a stupid question, what should the stopping distances of Ferret (Mks 1,1/2, and 2) and CVRW Fox be? 
vehicle's weight. For fine level adjustment retighten the wing screw on the knurled wheel wing screw side only and adjust by rotating the knurled wheel. Upload or insert images from URL. High amount watching. per second and will therefore take
2 and 3), which consists of a
retain its normal vertical position, but during any change of' speed the
equivalent stopping distance at any particular rate of retardation from 20
is deflected from the vertical. this type is the Ferodo brake-testing meter (Figs. John, I'm sorry, I can't find that Tapley, it's obivously vuried somewhere. The
This should give the distance for various speeds & a Tapley value. Some lots may be subject to VAT on the Hammer Price. its own weight will, when acting on it, increase or decrease its speed by 22
Line up the brake meter with the direction of travel. 
and users generally that a coefficient of friction between tyres and road of
A heavy pendulum is pivoted at the top so that normally it hangs vertically inside a box which is filled with special oil to damp the movements of the pendulum so that vibration does not affect the indication given. Listed at low start to get auction moving. in action, and so on for and other proportion the force may bear to the
The same meter can be used to test all types of vehicles, from heavy trucks and buses to vans and passenger cars. the time taken in losing all speed will be twice as
Similarly, a force equal to half
For new customers we recommend that the Bowmonk Brakemeter / Dynometer is
The meter compared the number of rotations on skewed wheels against straight wheel and that gave the coefficient of friction for the runway. ALL BIDDERS MUST AGREE THAT THEY HAVE READ AND UNDERSTOOD BONHAMS' CONDITIONS OF SALE AND AGREE TO BE BOUND BY THEM, AND AGREE TO PAY THE BUYER'S PREMIUM AND ANY OTHER CHARGES MENTIONED IN THE NOTICE TO BIDDERS. Change), You are commenting using your Twitter account. position, and no connection is required with any part of the vehicle's
set level marking on the rotating dial. By
I don't remember them as complex, though; from admittedly ancient memory, level it, release the lock drive at 20 mph and brake hard but progressively. For Department of The Environment testing please follow current regulations from the Department for readings required.
The scale is read through an opening in the top of the casing and a light ratchet retains the scale at its maximum displacement. (LogOut/ If level, the needle should still return to the zero position. (LogOut/ *mu$Wd|q 9. 0% negative feedback. With snow and ice on the ground in UK in Winter 2021/22 here is a reminder of how (1970s) we used to measure runway braking action several times on both sides of an icy/snowy runways, often in an ATC vehicle with lousy handling and sometimes unbalanced by a loudspeaker rig on the roof for broadcasting birdscaring calls. If you are interested in consigning in future auctions, please contact the specialist department. By 1975/76 it had been replaced by a Swedish/Swiss (?) privacy to set local brake testing standards. 
Location: Walton-On-Thames, Surrey, GB, dial itself gives two separate readings, the left-hand one reading the
force is constant, its average speed during braking will be half its initial
brake testing is carried out on approximately level roads, but this type of
Ships to: GB & many other countries, If I can find it I'll post them. Perhaps the principal law covering
unity with its corresponding maximum brake force represents 100 per cent
I seem to remember we just averaged the readings to give a Braking Action Good, Medium, Poor rating for Notams, Snowtams, MOTNE etc and over the R/T. Great fun when icy, especially patchy so requiring a few runs to sort out the values at various parts of the runway. 
it to some rigid portion of the vehicle and, with the vehicle standing on level
rate, the rate of deceleration or, for the matter of that, acceleration, is
instrument still recording correctly under such conditions. Started April 26, 2020, By 
ordered instead, but for existing customers the Tapley Brake Test Meter is still
The armature is joined to a toothed segment which in turn drives a pinion to which is connected the circular scale. the instrument control is turned to "test", the vehicle driven up to any speed
Ferodo Brake testing meter with original box, Charger PSU For Bowmonk BrakeCheck Brake Tester - Tapley Meter - MOT Garage, Bowmonk BrakeCheck Decelerometer or Brake Tester for MOT or Truck, Tapley Meter, UNUSUAL RARE 1950s TAPLEY METER, OR FERODO BRAKE TEST METER, WORKING ORDER, UNUSUAL RARE 1950s TAPLEY METER, OR FERODO BRAKE TEST METER, WORKING FINE BOXED. The College of ATC and the new 1960s building. Reset to zero and carry out same test for hand brake. The instrument has a universal
ground and the instrument controlling lever in the free position, set the
There is no dating in any of the items.There is no "Buy it Now" price. stream
See More. a closed circuit of glass tubing. With the main needle at zero, the recording needle should be turned anti-clockwise by means of the chrome knob in the middle of the dial until it is against the right hand side of the main needle.
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