Sure thing, just drop the mass, jump distance, airtime goal, and the 30‑G limit, and I’ll run the numbers. Remember the peak velocity comes out of sqrt(2gh) if you’re pulling 30 G over a 0.3‑second deceleration. For a solid frame you’ll want a safety factor of at least five on the welds, otherwise you’ll be bragging about a bruise, not a record. And hey, if it collapses, at least you’ll get a free crash test—just don’t make me do the data audit afterward.

Mass 12 kg, 17 m/s peak, 30 G means 294 m/s², so peak force about 3.5 kN. Add a safety factor of five, design for 17.5 kN over the impact zone. If your frame is 0.5 m long, that’s roughly 8.8 kNm of bending moment. With a 400 MPa steel or a 600 MPa titanium tube, you’ll need a cross‑section that gives a section modulus of at least 0.022 m³ to keep stresses under 60 MPa. The kinetic energy at launch is about 1.7 kJ, so your landing gear or air‑bag system must absorb that. Also remember the airtime: 0.4 s gives you 0.8 m of free‑fall drop, but your 7 m horizontal run still needs a smooth transition. Stick to that load path, keep the welds over the critical 17.5 kN zone, and you’ll be looking good on the jump log—no crash test needed, just the bragging rights.

Wall thickness check: for a round tube you need t ≈ (σ · D)/(2 · σ_allow). With 600 MPa steel, σ_allow about 60 MPa, and a 0.12 m diameter, that gives t around 1.2 cm. That keeps the section modulus at 0.022 m³ and keeps the 17.5 kN bolt‑root stress under 60 MPa. Keep that root clean, no burrs, and you’ll avoid a nasty crack when you hit 30 G. Once you hand me the CAD, I’ll run a quick stress check on the joint angles and tell you if the weld passes the 5‑point test. Let's get that fabrication plan tight and make sure the frame can handle the 3.5 kN peak without a single blister.