Follow-up on the Delta 4 Heavy

Fuel Bubbles May Have Tripped Sensors in Delta 4-Heavy Launch

While on the road last month, I noted an article that claimed the demonstration flight of Boeing’s Delta 4-HLV wasn’t quite as successful as initially reported.

Apparently those claims were true. It seems that fuel sensors on the primary stage and the two boosters reported “out of fuel” prematurely. The boosters and main stage shut down early, leaving the upper stage unable to make up the difference. End result?

10,000 miles short.