BST, what is the "set" intervalometer for LABS?

[WildBillKelsoe]

Referencing

 

https://www.google.com/patents/US2898809

 

Aug. 11, 1959 J. A. RYAN, JR

 

LOW ALTITUDE BOMBING SYSTEM AND APPARATUS Filed Sept. 15, 1955 5 Sheets-Sheet 1 INVENTOR. I JOH/Y H. 1876/) we.

 

BY I

 

' Armani-Y J. A. RYAN, JR

 

LOW ALTITUDE BOMBING SYSTEM AND APPARATUS Filed Sept. 15, 1955 Aug. 11, 1959 5 Sheets-Sheet 2 Aug. 11, 1959 Filed Sept. 15, 1955 LOW ALTITUDE BOMBING SYSTEM AND APPARATUS INVENTOR.

 

5 Sheets-Sheet 3 JOHN 6. E/H/V J16.

 

Aug. 11, 1959 J. A. RYAN, JR 2,393,809

 

LOW ALTITUDE BOMBING SYSTEM AND APPARATUS Filed Sept. 15, 1955 5 Sheets-Sheet 4 WLTJQSZ meal-r w -;w

 

INVENTOR. J0/7l7 '4. EYfl/V JE.

 

Aug. 11, 1959 J. A. RYAN, JR

 

LOW ALTITUDE BOMBING SYSTEM AND APPARATUS Filed Sept. 15. 1955 5 Sheets-Sheet 5 INVENTOR. JOH/Y F7. EYfl/Y JE.

 

WM. i N0 HTZOENEY? LOW ALTITUDE BOMBING SYSTEM AND APPARATUS John A. Ryan, Jr., Arlington, Va. I Application September 15, 1955, Serial No. 534,630 Claims. (Cl. 239-) (Granted under Title 35, U.S. Code' (1952), sec."266) The invention described herein may bemanufactured and used by or for the United States Government-for governmental purposes without payment to me of any royalty thereon.

 

This invention relates to an improved low altitude bombing system and apparatus for the release of high explosive devices and bombs from aircrafts, and ,primarily to an improved apparatus, system, and method of toss bombing of very high explosives above or on a selected target from a low'level approach-toward the target and providing a safe escape distance and maneuver for theaircraft after the released the explosive device or bom b, having for an'object the-accurate release and tossing of a high explosive device at a predetermined point in a flight pattern relative to the target, calculated in relation to the speed, altitude, and a selected pull up angle of the aircraft, including means for automatically releasing the bomb device at a predetermined 'angleof climb during the pull up.

 

A further object is the provision of a bombing system and apparatus for delivery of high explosive devices and bombs for accurate tossbombing thereof above, or on a selected target from a low level approach toward the target and providing a safe escape distance and maneuver for the aircraft following the releaseand tossing of the explosive device or bomb, having for a further'object the delivery of time delay fused types of high explosives, timed to explode above the target in relation to speed,

 

altitude, and a selected pull up and release climb angle,

 

including means for indicating to the pilot the time instant of release of the bomb device and the starting of the time for executing the predetermined escape maneuver, so that the aircraft will be flying at a safe remote distance from the bomb device and target area at the time of the explosion of said bomb device, and'moving in a direction away from the target, preferably Without crossing the projection of the explosive device or bombs trajectory on the ground.

 

A further object comprises an improved bombing system and apparatus for delivery of high explosive devices and bombs from aircrafts for accurate toss bombing of very high explosives above or on a selected target from a low level approach toward the target and providing a,

 

safe escape distance and maneuver for the aircraftfollowing the release of the explosive device or bomb Without crossing the projection on the ground of the explosive device or bomb trajectory having for a primary object the delivery of predetermined time delay fuzed types of high explosives timed to explode above or on the target in relation to the speed, altitude, and a selected pull up and climb angle of the aircraft from a predetermined or selected point to be crossed by theaircraft at a known distance from the target, including means for indicating to the pilot the time-for the precalculated rate of pull up during the approach together with means for automatically releasing of the bomb device at a predetermined angle of climb during the pull up at the precalculated safe escape distance from 3 the 'target area, including also pilot -signal means :to indicate when the release of the bomb takes place during the pull up constituting a signal for thepilot -to-' execute a pre'determined escape 'maneuver without 'crossingthe target area so that the aircraft will beat 'a safe remote distance from thebomb device at the time ofthe explosion thereof and flying in a substantially radial direction away from the target.

 

further'object is theiiprovision of an improve'd aircraft bombing system'in which'a preset-"adjustable timer or intervalometer-=device is provided in the aircrafttogether -with a normally cagable vertical gyroscope, in which the gyros'copeis uncag'e'd by'the pilot during the approach toward a selected target 5 prior to the crossing ofarselected: prominentgeographical reference point 'during the approach at a predetermined distance fromthe selected target, including :means under control of the pilot for simultaneously starting the intervalometer timing a cycle: and 1 the bomb 'fuze timing *cycle, in" which the first intervalometer control's a :pull up or climb signal indicating means for'thespilot, to 'determinethe time for execution of the" predetermined climb or pull up maneuver at apredeterminednumber of gs,--and includes release :means controlled by the vertical gyroscope for effecting: an automatic release of the bomb device at substantitally anytpredetermined or selected 'ang'le-ofclimb also including signal means' for indicating when the bomb has been "released and time for initiating I the predetermined escape maneuver in order *to'provi'de-a sufficient fuzed bomb devices by' ai'rcraft, I inwhich the-aircraft isfiown toward a seleotedi target at'a prescribed low altitude overia'zpreselected terrain inwhich some suitable initial permanentpoint or fixed geographical reference point is'present andifairly.easilyfdiscernable, preferably having a long "dimension perpendicular 'to' the 'flight path toward, and at a suitable remote distance from, the se-' lected target, forinstancefro-m between 3"to 6 miles, a settable timerror fuze mechanism being provided in" the bomb and preset before reachingthe initial point for determining the range between the initial-or prominent point and the desired point of explosion of the bomb device over'the selectedtarget, calculatedin time inaccordance with vthe 'expectedspeed of theaircraft from the initial or prominent pointto the calculated pull up point,rplus the pull upftime tothe climb angle, during the 'pull up,'at'which'the bomb is to be released, plus thettrajectory or travel time of the bomb from its release point to the point above or on the target-where the burst is totake place, an intervalometer or timer mechanism being also'provided in the aircraft Which is adjusted" prior .to reaching the initial or-prominent point to indicate the. calculated instant for the pull up for eifecting therelease-of the bomb device from the instant of passageof the aircraft over the initial or prominentpoint invterms'of' the expected ground speed of the aircraft, the system providing means under control of the pilot 'for simultaneously:initiating'both'of'the timers into operation just as the initial'point is crossed, including means fortreleasing the bomb automatically during the pull. up"

 

ata precalculated angle ofclimlz pwith the; pull .uppoint precalculated at a suflicient distance from the target, between the prominent point and the target, to permit the aircraft to execute a substantially 180 turn or an Immelmann, or a loop and be flying away from the target at a safe escape distance from the bomb device at the time that it is exploded by its timer.

 

. A further object is the provision of means under control of the pilot for interrupting the timing cycles of both timers and restoring them to their initial starting position at any time prior to the time of pull up and release of the bomb device.

 

In one form of the invention the distance :between the selected prominent geographical or initial reference point and the target is composed'of two time segments, one being the time from the initial point to the pull up point, plus the time required from the pull up" point to the bomb release point, and the other is the calculated trajectory time from the release point to the burst point over or on the target, this latter segment from release point being what might be termed as the safe escape time or distance. The timer in the explosive device is set preferably to include both time segments. Since the geographical location of the prominent or initial point with respect to the target will vary depending upon the selected target, while the pull up time plus the escape time period, can be considered at a substantially fixed minimum, for the particular explosive device employed, the first or variable segment is calculated by subtracting the second or minimum distance, or safe time factor plus pull up time from the total distance or time factor, from the initial point to the release point, plus the trajectory time of the released explosive device to the target. The resulting range segment can therefore be easily varied to suit the geographical conditions encountered.

 

Assuming that a conventional intervelometer is used which can be set for any time interval up to 24 seconds in intervals of .02 second, and that the bomb also has a suitable similar timer or intervalometer therein functioning as a time delay fuze device, then at 546 miles per hour the speed is 800 feet per second and .01 second error is 80 feet and .02 second error is 160 feet. A 4 g pull up at the assumed speed represents about 2241 feet or travel and this is precalculated and fixed, but may vary depending on the climb angle in the pull up where release takes place. The trajectory of the'bomb device after release depends upon an initial 800 feet per second, plus the fuze time in the bomb if the burst is to take place above ground and the trajectory time can be longer if release (climb) angle is increased. For instance, above 45 climb angle, the range may be shorter, although the time between release of the bomb and burst may be increased with safety if desired, also a change in the approach altitude will effect the maximum time of trajectory for a burst in the air at the same elevation above the target.

 

Assuming that the center of a selected target area from a selected prominent geographical reference point, such as a road, railroad, dam, or bridge running substantially transverse to the flight path toward the target is 17,542 feet, also that no wind is present and therefore no reduction or increase in air speed need be calculated, and calculating aircraft ground speed at 800 feet per second (546 mph.) and also assuming a 4g pull up from level flight to a predetermined climb angle of 20 where the bomb is automatically released is calculated, at a distance of, for example, 10,000 feet from the target, the 4g pull up distance in this instance to bomb release angle will cover 2241 feet ground range. Since total range distance from the initial point to the target is as sumed to be 17,542 feet the sum of the distance from the release point to the target is added to the 4g pull up distance and this total is then subtracted from the total distance between the target and the prominent or initial point, hereafter indicated as I.P., thus leaving a range distance of 5301 feet from the LP. to the pull up point and this is set on the intervalometer in the aircraft in the form of seconds and fractions of seconds, the intervalometer timing cycle being started by the pilot depressing the lbomb button as the aircraft crosses the LR, and as indicated, also determine the time for the initiation of the 4g, for example, pull up or climb, the bomb being released automatically at the selected climb angle as determined by the closing of electrical sector switch contacts in a vertical gyro, the intervalometer or timer in the bomb device or fuze being preset, preferably before take-off for the time period to include the time of flight from the LP. to the pull up point plus time from pull up point to the release point, plus the time of flight or bomb trajectory from the release point to the burst point, located at or over the target.

 

These time intervals are easily and conventionally calculated and tabulated, and therefore specific times are not given. However, for the example indicated above it would be 23,886 seconds and the timer in the bomb device is set for that time and initiated into operation as the aircraft crosses the I.P." simultaneously with the range timer for indicating the time when pull up point is reached. From the example given it will be seen that the time remaining from the initial point to the release point is 9.486 seconds.

 

Initial point to pull up point 6.626 sec. Pull up point to release point 2.860 sec.

 

Initial point to release point 9.486 sec. Calculated bomb flight or trajectory time from release point to burst point 14.40 sec.

 

Bomb device timer set at 23.886 sec. total.

 

Assuming that 14.4 seconds is considered a suflicient time to provide a safe escape distance for the aircraft by banking and executing turn, which in this example causes the aircraft to fly radially outbound from the expected burst point to elfect best escape, or by executing an Immelmann or a loop immediately following the bomb release, so as to be flying away from the burst point, at a distance, for the example given, of approximately 10,000 feet from the burst point over the target area. With faster aircraft, including modern jets the escape distance can be increased, or the calculated release point can be moved further from the target, or bomb devices of greater destruction power can be employed.

 

A further object of the invention is therefore a method and means for delivering a high explosive bomb device with greater accuracy over or on a selected target during a low level approach, Without requiring the aircraft to approach too close to or cross the target area.

 

 

 

So I need the preset intervalometer setting for DCS F-86F if you please so I reverse the calculation.