Value chain · CLM-0682
In plain terms
A 2013 design paper, written years before and independently of NASA's 2024 study, states almost the same speed-change requirement for reaching high orbit that NASA later published - two unconnected sources agreeing on the same physical number.
The claim as recorded
Leitgab's 2013 design independently states "electric propulsion systems with ISP = 3000 s can achieve the necessary delta-v for geostationary orbit (GEO) from LEO of about 4.7 km/s using a spiral transfer orbit" - closely matching NASA OTPS's own 2024 figure of ">4,700 m/s" (SRC-012), from a source with no connection to NASA OTPS's later report.
Evidence behind this: T2/T5
Scope and limits
Both figures describe the same well-understood orbital-mechanics requirement (LEO-to-GEO delta-v via a low-thrust spiral), so convergence here is expected physics agreement rather than a surprising independent discovery; it is recorded because it corroborates NASA OTPS's own figure from an earlier, unrelated source, which is still useful confirmation.
What it assumes
No assumptions are recorded against this claim.
Where it comes from
Leitgab (2013): "Electric propulsion systems with ISP = 3000 s can achieve the necessary delta-v for geostationary orbit (GEO) from LEO of about 4.7 km/s using a spiral transfer orbit." SRC-012, PDF p.90: "assuming >4,700m/s is needed to reach GEO from LEO."
Basis: m/s, seconds (Isp)
Related records
- Answers question
- QST-002 not published in this release
Cite this
energyaperture.com/c/clm-0682
CLM-0682, Energy Aperture, as of 2013.
Connected records
Other published records linked to this one. A list, not a judgement.