PilotPete

Well-known member
First Name
Pete
Joined
May 8, 2023
Threads
12
Messages
1,577
Reaction score
3,952
Vehicles
Porsche, BMW, M3LR on order
Occupation
Chief Pilot
Country flag
Turn on the rocket engine! 😱
CAUTION: WORTHLESS INFORMATION CALCULATED QUICKLY WITH A VERY JET LAGGED BRAIN. (Sorry if I didn’t carry the 1 or something)

So for fun (yeah, I’m a nerd) I looked at public data on the Raptor3 engine. The weight of the Raptor2 has been reported at 3,500# of weight. the R3 thrust has been demonstrated (so far) at 590,000# thrust at SL. If we assume the trailer (as mentioned above) is ~2K# as well as the cradle, and a ~7k# CT, and fill the bed with 3,500# of fuel (good for 2.5 seconds of 100% thrust) would give you almost 33Gs of acceleration. Now, provided you could figure out a way to not shred the CT and its occupants apart and kill any living being inside, and not accounting for aerodynamic drag (cuz I don’t have a reliable cd, and at these numbers, who cares) you are looking at a speed of somewhere around 1750+mph. All in 2.5 seconds. Mach 2.33 in a standard atmosphere. Which looked pretty close to that video of the CT pulling away at the light.

I don’t think it matters if you are in front or behind the engine at that point.
 

fritter63

Well-known member
First Name
Mark
Joined
Jan 21, 2020
Threads
33
Messages
1,445
Reaction score
2,931
Location
Atascadero
Vehicles
2018 Model 3 LR, 2019 Model 3 SR+
Occupation
Retired Software Engineer, Woodworker and guitar builder extraordinaire
Country flag
Not happy to see all the "oil canning" (~5 minute mark). Hopefully that's one of the earlier builds!
 

Tinker71

Well-known member
First Name
Ray
Joined
Aug 8, 2020
Threads
85
Messages
1,518
Reaction score
2,014
Location
Utah
Vehicles
1976 electric conversion bus
Occupation
Project Manager
Country flag
That's payload. EM stated it can tow up to 14k in top spec ...
Most trucks can tow just about anything off public streets. EV vehicles even more. Just limited by hitch capacity and low speed steering and stopping control, but judging by the trailer tires I doubt it weighs more than 14,000 lbs.
 

FenryHonda

Active member
First Name
Larry
Joined
Dec 16, 2019
Threads
1
Messages
26
Reaction score
26
Location
Lynn Haven, FL
Vehicles
Toyota Sienna, Ford Crown Vic, Subaru Forester
Occupation
Environmental Specialist
Country flag
I love it. No matter how advanced our equipment is, we still have to jump on the bed of the truck to release the hitch.
 


JBee

Well-known member
First Name
JB
Joined
Nov 22, 2019
Threads
18
Messages
4,795
Reaction score
6,174
Location
Australia
Vehicles
Cybertruck
Occupation
. Professional Hobbyist
Country flag
CAUTION: WORTHLESS INFORMATION CALCULATED QUICKLY WITH A VERY JET LAGGED BRAIN. (Sorry if I didn’t carry the 1 or something)

So for fun (yeah, I’m a nerd) I looked at public data on the Raptor3 engine. The weight of the Raptor2 has been reported at 3,500# of weight. the R3 thrust has been demonstrated (so far) at 590,000# thrust at SL. If we assume the trailer (as mentioned above) is ~2K# as well as the cradle, and a ~7k# CT, and fill the bed with 3,500# of fuel (good for 2.5 seconds of 100% thrust) would give you almost 33Gs of acceleration. Now, provided you could figure out a way to not shred the CT and its occupants apart and kill any living being inside, and not accounting for aerodynamic drag (cuz I don’t have a reliable cd, and at these numbers, who cares) you are looking at a speed of somewhere around 1750+mph. All in 2.5 seconds. Mach 2.33 in a standard atmosphere. Which looked pretty close to that video of the CT pulling away at the light.

I don’t think it matters if you are in front or behind the engine at that point.
I've honestly been wondering for a few months now if some day we can buy Raptor engines second hand from SpaceX to build our own SS tanks and rocket to space on own DIY spaceships.

I was already thinking of building a model on Kerbal Space, maybe single vacuum raptor on a shuttle type craft, and three SL Raptors on a booster should be enough and do about the same as Falcon? Both fully reusable but smaller scale. Maybe you can do the math for that quick? ;)

I always liked the SABRE powered Skylon concept, and have always wondered if there's less if a brute force method of getting to orbit.
 

Ehninger1212

Well-known member
First Name
Jake
Joined
Dec 18, 2019
Threads
4
Messages
1,222
Reaction score
2,523
Location
Houston, TX
Vehicles
Audi A3 E-Tron - 2005 Land Rover LR3 - T-Bucket - 1951 chevy 3100
Occupation
Architect/Fabricator
Country flag
oh wow... much tow, so impress.
 

rizvend

Well-known member
First Name
CyBrNrD
Joined
Jun 3, 2020
Threads
14
Messages
569
Reaction score
811
Location
66215
Vehicles
cybrtrk, aptera reserved
Occupation
Nurse Informaticist
Country flag
I don't see "booster rocket" in the list for Cybrtrk configurator. Is this the performance variant Elon was talking about? 🤔
 


Coolbreeze704

Well-known member
First Name
Bruce
Joined
Nov 23, 2019
Threads
15
Messages
1,412
Reaction score
3,762
Location
Troutman,NC
Vehicles
2022 Model Y, 23 Lightning, CyberTruck (someday)
Occupation
GM Manufactured Homes
Country flag

GlockandRoll

Banned
Well-known member
Banned
Joined
Aug 19, 2022
Threads
3
Messages
303
Reaction score
302
Location
Area S4: Papoose Lake
Vehicles
Porsche on the weekends, diesel truck mon-fri
Occupation
Arms dealer and musician
Country flag
So how much does that engine weigh
I'm no rocket surgeon, but I believe it has a 143.8 thrust-to-weight ratio and provides 590000 lbs of thrust, so with that, I'm figuring just a tick over 2 tons.
 

SONNYDUT

Well-known member
First Name
Sonny
Joined
Dec 16, 2019
Threads
5
Messages
212
Reaction score
437
Location
Westminster, Ca
Vehicles
Lexus GX470, 3x Audi A3, Honda Van, Model S, Tri-Motor Cybertruck
Occupation
CAD Designer
Country flag
This is great to see the CT in action. Raptor engine is not too heavy but that trailer alone is massively heavy, 7k lb. min. Thank you for the video.
 
 




Top