My quest for an O motor launch.

[Bat-mite]

John,
If you need hardware I'd be happy to loan it to you..

Super build by the way..
I'd expect nothing less though..

Teddy

Scott and I are going in halfsies on a custom-made, 72" by 98mm bolted casing. He already has it turned, but we need to test fit before moving forward.

Thanks for the offer, though.

 

[GeoffHuber]

For 98mm bolted cases, I machined a tool (you can also 3D print one) that slides over the end of the case and has guide holes in it for drilling the bolt pattern. So all it takes to make a new case is to cut to length, slide the tool over the end and drill the holes through the tool.

 

[Bat-mite]

For 98mm bolted cases, I machined a tool (you can also 3D print one) that slides over the end of the case and has guide holes in it for drilling the bolt pattern. So all it takes to make a new case is to cut to length, slide the tool over the end and drill the holes through the tool.

Cool. I don't know what Scott has planned, but I'll pass this idea along.

 

[Onebadhawk]

Anytime John..

Teddy

 

[Bat-mite]

Got her weighed last night. Apart from recovery, motor, etc., the built rocket weighs about 66 pounds.

 

[Bat-mite]

I'm coming up with about 115# on the pad, 100# descent weight, 19-ft Rocketman main chute.

 

[Bat-mite]

Wowee! Scott sent me an engine file, and it looks like we'll be making a red motor, with apogee simmed at 14,774 feet, max speed Mach 1.67. Sweet! This flight will set new impulse, altitude and velocity records for me.

 

[Joe Bruce]

Sweet! My daughter and I (and son if he isn't at school) don't want to miss THAT launch!

 

[Bat-mite]

Hmm, strike that. More like Mach 1.16. RockSim has the faster velocity, but I designed the model in OR and imported into RS. I am going to trust OR, which has a max velocity of 890 MPH.

 

[Bat-mite]

Sweet! My daughter and I (and son if he isn't at school) don't want to miss THAT launch!

Thanks. Plan to attend as many Higgs Farm launches as you can, because I don't know exactly when it will happen. At that altitude, weather will be a major factor. Of course, I still need to order a chute, make the motor, etc., etc. Probably not till early 2020 at the earliest.

 

[tim cubbedge]

Your O propellant really only weighs 15#?

 

[Rocketjunkie]

Your O propellant really only weighs 15#?

To get into the O range (by 1 N-s) would require an Isp of 307 for 15 lb. of propellant.

 

[Bat-mite]

I didn't say the prop weight was 15#. Did you get that from subtracting the burnout weight from the pad weight? I guessed at the burnout weight.

 

[Bat-mite]

Prop weight according to RockSim file is 24.160459 lb.

(rk) (pr)(hw)(rec) (pad w)
So, 66 + 24 + 22 + 7 = 119.

Would 95 - 96 lb. be a better guess at descent weight?

 

[tim cubbedge]

Did you get that from subtracting the burnout weight from the pad weight? I guessed at the burnout weight.

yes. Just seemed light.

 

[Nytrunner]

That's just a little more than the dense O3400 I-max propellant that fits in a 50" case!

 

[mbeels]

Thanks. Plan to attend as many Higgs Farm launches as you can, because I don't know exactly when it will happen. At that altitude, weather will be a major factor. Of course, I still need to order a chute, make the motor, etc., etc. Probably not till early 2020 at the earliest.

Any idea how many Higgs farm launches there will be in 2020? Is it just once a year at Red Glare?

 

[Bat-mite]

Any idea how many Higgs farm launches there will be in 2020? Is it just once a year at Red Glare?

Normally one weekend a month from November thru April. I don't go on Sundays, so my launch will be on a Saturday.

 

[Bat-mite]

That's just a little more than the dense O3400 I-max propellant that fits in a 50" case!

Yeah, we can't pack our grains that tight! And I'll be $%$@$# if I'm paying $1400 for a reload!

 

[Bat-mite]

Test fitted the motor last night. Good to go!

 

[Joe Bruce]

Wow! Now THAT is a motor!

 

[mbeels]

Wow

 

[Rail Dawg]

Nice!!!

Chuck C.

 

[Bat-mite]

Scott is going to do a test burn on a very long 38mm motor to get some burn characteristics.

 

[Bat-mite]

Here she is, in all her glory!

As designed, couldn't get the pic to scale just right.

 

[Joe Bruce]

Here she is, in all her glory!

Oh, man! That is AWESOME! Beautiful rocket!

 

[Bat-mite]

Oh, man! That is AWESOME! Beautiful rocket!

Thanks!

 

[neil_w]

Came out great. That thing is a beast!

 

[BABAR]

Wow, reeeeeaaaalllllly nice!
My best wishes for a straight trail and a soft landing!

 

[Theory]

Ooooooo, that came out reeeal nice!