Before telling the question, I would like to tell you about my plan. I plan to demonstrate Orbiter in my school's annual Science and Math exhibition. I already mastered the technique to fly, rendezvous and dock to the ISS and also fly to moon and back with the former using Transfer MFD and the later using TransX.

However, I encountered problems while flying to Mars. I started up with the default DG Mk4 in orbit scenario. First, I align my orbital plane with respect to Mars by burning normal/anti-normal using the Align Plane MFD, that is to reduce relative inclination to zero. Next, I circularized my orbit to approximately 300 km i.e. an LEO. Then, I used the Transfer MFD to set up my trip to Mars, using Sun as reference, Earth as source and finally Mars as target.

I warped time until some 2000 seconds DTe, i.e. time before ejection point and burned normal/anti-normal to reduce relative inclination once again to zero. Finally, I orientated my DG prograde to begin for TME (Trans-Martian-Ejection). Just 145 seconds before ejection point, that is 145 seconds DTe. I applied full main engine burn until DTe counted zero. Yet, I hadn't escape earth gravity. My orbital eccentricity did not exceed 1 but was only approximately 0.96.

Here is how I calculated the DTe to be 145 seconds.

I used the kinematics formula v=u+at. V is final burn-out velocity, u is initial velocity, a is acceleration and t is the value in interest. I started with u-value of 7.746 km/s. Delta-V is approx. 3.110km/s. So, v-value is 10.856km/s. To calculate a-value, use Newton 2nd Law of Motion, F=ma. Rearranging,

a=F/m

Full main engine thrust provides 400 kN of force, thus F=400kN

Mass of DG before burn=18673.7 kg (Mass of DG remains constant throughout the simulation period as I unchecked the limited fuel option in the launchpad)

Substituting the F and m values, I get an a-value of 21.42 m/s^2.

Substituting all values into the equation v=u+at,

10856=7746+21.42t

t=3111/21.42=145.2 seconds.

I was using ASUS A53TA with AMD A6 APU 1.4GhZ, 6 GB RAM and 1GB HD6720G2 Radeon graphic card (Dedicated).

Hopefully the information provided above is sufficient enough for kind experts to help out.

Thank you.

Regards,

Nicholas