[amsat-bb] What is wrong in the calculations ???

["William Leijenaar" <pe1rah@xxxxxxxxxxx>]

Hi AMSATs,

I am doing some calculations with a E to M mission :o)
No EME, but just EM hihi
I didnt talk about m**n :o)

On internet I found some interresting calculations, but after some 
investigation I find some problems.
The calculations can be found on the following webpage:

http://hyperserver.engrg.uwo.ca/ilc-usn/Reports/LTVS/html/Mission%20Profile%20and%20Functions.htm

In the page the following can be found:
"the velocity of the LTVS as it approaches the moon can be found by:"

Followed by following formula
-----------------------------
Vb = sqrt(2u/Rb)             ** sqrt is square root

>From other formulas I have, it seems to me that the "2u" must be "u"
My calculations:
The following formulas I have used:

1: V,orbit = sqrt(R x g,orbit)
2: g,orbit = G x M / R^2
3: u = G x M

When changing g,orbit of formula 1 we get:
------------------------------------------

V,orbit = sqrt(R x (G x M / R^2) )

Changing "G x M" in "u" gives:
------------------------------

V,orbit = sqrt(R x u / R^2)

And finally we get:
-------------------
V,orbit = sqrt(u / R) !!!!!!

So where is the 2 comming from ???
Maybe some other formula or other speed is calculated ???

73 de PE1RAH, in Peru, close to Machu Picchu :o)
---

_________________________________________________________________
Protect your PC - get McAfee.com VirusScan Online 
http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963

----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org