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derstosstrupp · 10-14-20, 08:17 PM

TVRe (TDC) Models

WHAT THEY HAD
Prior to mid-1940 or so, boats (generally VIIA and B and IXA and B) were fitted with one of two older TVRe models - the C/36 or the C/37. The differences between these are insignificant for our purposes, but the most noteworthy thing about these is they were more or less “point and shoot”. In other words, bearings were transmitted from the optics as in game but the AOB didn’t change as you rotated the optics, so AOB needed to be set for each shot. Also, the parallax correction (correcting for the lateral distance from tubes to optics) needed to be entered by hand.

In 1939 the model S3 was introduced and started being installed on VIICs and IXs in 1940. With this came the key feature “Lage laufend”, a functionality that updated AOB for every degree of bearing change caused by rotating the optics or changing own course (by way of an AOB synchro motor and connectivity to the gyrocompass). This is a HUGE advantage over older models as it allowed more freedom of maneuver and made it so subsequent targets on the same course could quickly be engaged. AOB only needed to be entered once. Also, the parallax correction was automated in this model.

WHAT WE HAVE
The TDC we have in SH3/5 functions like a blend of old and new models - it will update AOB as you rotate the scope, as the newer S3 model did, but then it doesn’t take your own course changes into account as the S3 did.

SIMULATING THE MODELS
VIIA/B or IXA/B Before mid-1940:
You have a C/36 or C/37. Determine what bearing you’d like to shoot at and set optics there. Click the TDC on to update the bearing and gyro angle then immediately off. Set the target data including AOB corresponding to that specific bearing. Do NOT turn TDC back on! Fire when the target crosses the wire. Do this for each shot. Switch targets, click on/off to update bearing, set new AOB etc, fire. Sure, you lose the transmission of the bearing but at least you don’t need to mess with the parallax correction.

Mid-1940 and later:
You have the S3. Operate as you normally would. Granted you are missing the connection to the gyrocompass so you have to reset AOB when changing course, but that’s SH3/5.

10-14-20, 08:17 PM	#209
derstosstrupp Grey Wolf Join Date: Aug 2008 Posts: 918 Downloads: 490 Uploads: 0	TVRe (TDC) Models WHAT THEY HAD Prior to mid-1940 or so, boats (generally VIIA and B and IXA and B) were fitted with one of two older TVRe models - the C/36 or the C/37. The differences between these are insignificant for our purposes, but the most noteworthy thing about these is they were more or less “point and shoot”. In other words, bearings were transmitted from the optics as in game but the AOB didn’t change as you rotated the optics, so AOB needed to be set for each shot. Also, the parallax correction (correcting for the lateral distance from tubes to optics) needed to be entered by hand. In 1939 the model S3 was introduced and started being installed on VIICs and IXs in 1940. With this came the key feature “Lage laufend”, a functionality that updated AOB for every degree of bearing change caused by rotating the optics or changing own course (by way of an AOB synchro motor and connectivity to the gyrocompass). This is a HUGE advantage over older models as it allowed more freedom of maneuver and made it so subsequent targets on the same course could quickly be engaged. AOB only needed to be entered once. Also, the parallax correction was automated in this model. WHAT WE HAVE The TDC we have in SH3/5 functions like a blend of old and new models - it will update AOB as you rotate the scope, as the newer S3 model did, but then it doesn’t take your own course changes into account as the S3 did. SIMULATING THE MODELS VIIA/B or IXA/B Before mid-1940: You have a C/36 or C/37. Determine what bearing you’d like to shoot at and set optics there. Click the TDC on to update the bearing and gyro angle then immediately off. Set the target data including AOB corresponding to that specific bearing. Do NOT turn TDC back on! Fire when the target crosses the wire. Do this for each shot. Switch targets, click on/off to update bearing, set new AOB etc, fire. Sure, you lose the transmission of the bearing but at least you don’t need to mess with the parallax correction. Mid-1940 and later: You have the S3. Operate as you normally would. Granted you are missing the connection to the gyrocompass so you have to reset AOB when changing course, but that’s SH3/5. __________________ Ask me anything about the Type VII or IX! One-Stop Targeting Shop: https://drive.google.com/drive/folde...WwBt-1vjW28JbO My YT Channel: https://www.youtube.com/channel/UCIJ...9FXbD3S2kgwdPQ Last edited by derstosstrupp; 02-08-23 at 04:36 PM.