### Supersonic, I'm going to do it.

Yep, you heard me right, I'm going to build the world's first supersonic RC plane, almost doubling the world's present RC speed record. Reason why I'm doing this is to get the attention of the aerospace industry so that they might consider me someday.

Yes, I know the technical challenges will be enormous, but that is why I am doing this, to demonstrate what I can do. Plus it will finally be a chance for me to put my degree to use.

Now the biggest challenge will be finding a place for me to actually fly supersonically, not that every flight has to be supersonic. I am aware that when airplanes travel at that speed a sonic boom is usually created. However, since this design will be smaller, so will the sonic boom.

Another concern of mine will be heat, as air friction compresses the air, heating it up. The temperature I estimate I will reach will exceed the maximum of some of the components, so I will need some sort of cooling mechanism, and just fans won't cut it.

Now I know some of you may have alarming concerns, but if you calmly address them with me I will address them. I'm posting this here because I may need advise for the type of parts I need and other recommendations you may have.

Aerospace V logger out.

#### Replies

• There's no way a \$8 plastic rotor is going to withstand a 700 mph airstream. Even if the blades didn't fold back and break off, the RPM needed to travel through the air at that speed would explode the rotor.

Isn't it easier to do something like an alcohol ram jet or other similar engine? You'll definitely never go supersonic without some form of AB or Rocket motor. And an afterburner means unholy amounts of fuel.....

You going to have to sit and whip out the physics books and start doing math. How much energy does it take to hit 800 mph at sea level, then take that and divide up the energy density of your fuel and see how much this thing will weigh.

• My posts indicated it IS fueled by alcohol. If it were not for the electric ducted fan in front of the burner, it actually would be a ram jet. It's just that ram jets don't produce static thrust.

And yes, I have been doing many of the calculations. And it's not how much energy you need, it's how much power you need.

• Now if you do it with a Foamy, I'll be really impressed !

• No way will this thing be made from foam, you can count on that.

• So you are going to design your own engine from the ground up. That will be interesting.

• Not completely. It will use the E-flite Delta-V 32 EDF as a compressor, but it will also use an ethanol fueled augmenter with a linear aerospike nozzle.

• MR60

You should reuse some of the Area 51 retro engineered alien tech, such as magneto-Hydro-Dynamic techniques (MHD) generating high magnetic fields at the nose level of your plane, high amps currents, to create an aspiration force that will suck the air in front of the plane. (the old F=B x I x L electromagnetice formula)

That way you will avoid the supersonic boom.

However I'm afraid that if you do this, the military will lock you away in groom lake and we will never hear about you anymore on this forum.

• I think radio shack has (MHD) on sale ;-)

• What is your budget for this project?
• Presently my funds are very tight but I guess around \$3000 ought to do it. However, that does not cover the R&D costs.

### Activity

RT @chr1sa: Just a week to go before our next @DIYRobocars race at @circuitlaunch, complete with famous Brazilian BBQ. It's free, fun for k…
Saturday
How to use the new @donkey_car graphical UI to edit driving data for better training https://www.youtube.com/watch?v=J5-zHNeNebQ
Nov 28
RT @SmallpixelCar: Wrote a program to find the light positions at @circuitlaunch. Here is the hypothesis of the light locations updating ba…
Nov 26
RT @SmallpixelCar: Broke my @HokuyoUsa Lidar today. Luckily the non-cone localization, based on @a1k0n LightSLAM idea, works. It will help…
Nov 25
@gclue_akira CC @NVIDIAEmbedded
Nov 23
RT @luxonis: OAK-D PoE Autonomous Vehicle (Courtesy of zonyl in our Discord: https://discord.gg/EPsZHkg9Nx) https://t.co/PNDewvJdrb
Nov 23
RT @f1tenth: It is getting dark and rainy on the F1TENTH racetrack in the @LGSVLSimulator. Testing out the new flood lights for the racetra…
Nov 23
RT @JoeSpeeds: Live Now! Alex of @IndyAChallenge winning @TU_Muenchen team talking about their racing strategy and open source @OpenRobotic…
Nov 20
RT @DAVGtech: Live NOW! Alexander Wischnewski of Indy Autonomous Challenge winning TUM team talking racing @diyrobocars @Heavy02011 @Ottawa…
Nov 20
Incredible training performance with Donkeycar https://www.youtube.com/watch?v=9yy7ASttw04
Nov 9
RT @JoeSpeeds: Sat Nov 6 Virtual DonkeyCar (and other cars, too) Race. So bring any car? @diyrobocars @IndyAChallenge https://t.co/nZQTff5…
Oct 31
RT @JoeSpeeds: @chr1sa awesomely scary to see in person as our \$1M robot almost clipped the walls as it spun at 140mph. But it was also awe…
Oct 29