Recent content by Tim Moore

The Lotfernrohr 7 bombsight:

Harry Wimperis got the ball rolling in 1916, developing a line of bombsights that could solve the drift problem. The Mark IX was used in WWII. View: https://youtu.be/L0GH8bmW59I

I would like to answer your question as best I can. As a pilot, and I don't know if you are or not, I might use terms differently. I certainly don't in any way want to be condescending, so forgive me if I appear so. A turn is a change in the heading. A coordinated turn uses equal bank...

Both gyros have a caging knob. It rotates a pair of collars that lock the gyro in place. Drift correction is simply angling into the wind so that the ground track proceeds directly to the target, without being blown off course. It is straight and level flight, without turning once the heading...

To further answer the original post's questions, airspeed was determined directly by pitot-static input. The wind speed and direction were calculated by the bombardier and input via two dials. The course information was input either by a remote compass or manually using a course knob; the...

The Mark XIV or Sperry T-1 had two gyroscopes. One was in the computer, to adjust for climb and dive in the pitch axis, and the other was in the sighting head, to adjust for roll. The sighting head gyroscope was geared so that the mirror rotated at half of the bank angle. The computer gyro...

Here is a video demonstration of the Sperry T-1 Bombsight, the American version of the English Mark IV Bombsight. Although manufactured in America for British use, some did end up in American Aircraft. (Apologies for the uneven sound quality. It was difficult working with multiple vacuum...

Looking in the background behind Bill’s dog, I think he needs more toys. Provided the local stores have any left.

Doolittle.

Thank you so much.

Bill, I have a technical question for you, if you can remember. How did the bombardiers who were not lead toggle their bombs manually? I know that once the Norden bombsight is armed, you can manually turn the displacement knob until the indicators meet and complete the circuit and activate the...

You look great!

Gorgeous.

Sorry, no rebuild. Have to replace it.

As a Cardiovascular surgeon, we use hypothermia routinely in our complex cases. Cooling the patient reduces the metabolic rate and demands for oxygen. We use moderate hypothermia, 25-30 degrees Celsius, to protect the heart during long and difficult cases. We use deep hypothermia, 13-16...