MissStabby Posted September 4, 2012 Share Posted September 4, 2012 Currently i built a jet that should be able to climb to 15km before i dump the jetengines+tanks to continue with rocketpowerThough often just below 10km my jet keeps flipping over.currently im climbing at an angle of 30 degrees.Is this optimal? should it be steeper or more subtle? Link to comment Share on other sites More sharing options...
Shpaget Posted September 4, 2012 Share Posted September 4, 2012 That depends on airspeed and the angle of attack.If your jet is flipping it sounds like you might need more speed. Link to comment Share on other sites More sharing options...
Elmetian Posted September 4, 2012 Share Posted September 4, 2012 I think it might depend how it's flipping over. Is the nose going up, putting it into a backflip? Is the nose dropping? You may need to re-balance the spaceplane so that when you dump the jet engines, the center of mass doesn't move too far forward or backwards. If the nose is pitching up uncontrollably, move some mass forward by adding extra fuel tanks near the front, or by moving the wings forward. If the nose is dropping, move some mass backwards.Generally, you want it to be slightly heavy in the rear so that it naturally pitches up. I assume you're using the advanced SAS as well? If so, either pull up with the SAS still engaged (this might take a while as you force it upwards), or disengage and re-engage the SAS quickly while tapping S. Link to comment Share on other sites More sharing options...
Markus Reese Posted September 4, 2012 Share Posted September 4, 2012 I found the most common cause for a flipover in space planes is either a fuel burn imbalance. This often due to extravagant fuel tank setups, or thrust imbalance. If you engines off the z axis centre of gravity and not enough arial control surface, the trust alone will cause your vehicle to begin to rotate. Link to comment Share on other sites More sharing options...
bsalis Posted September 5, 2012 Share Posted September 5, 2012 No lift from wings means no flipping. Link to comment Share on other sites More sharing options...
Suzaku Posted September 5, 2012 Share Posted September 5, 2012 It sounds like your center of thrust is not lined up with your center of gravity. do you have any pictures of your craft? Link to comment Share on other sites More sharing options...
Zephram Kerman Posted September 5, 2012 Share Posted September 5, 2012 Depending on your airspeed, there should be enough pressure at 10km to keep under control. I'm guessing you keep the 30° pitch angle all the time? As you get higher, the rate of climb will decrease. Eventually this means your angle of attack becomes too large and you'll stall.Instead, climb steeply at first, and gradually level out to your ceiling altitude. The key is to keep going faster so that the engines are happy with the reduced air density. Link to comment Share on other sites More sharing options...
tehmannz0r Posted September 5, 2012 Share Posted September 5, 2012 I was having this same issue, and reading through the replies was helpful- more speed helped for me at least. Link to comment Share on other sites More sharing options...
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