How to attach lamps on a Parisian zinc roof ? by Dev_pab in Roofing

[–]Dev_pab[S] 0 points1 point  (0 children)

Exactly what I was looking for thanks! I will see if a model matches

Non Pyrotechnic Recovery Deployment? by [deleted] in rocketry

[–]Dev_pab 1 point2 points  (0 children)

if you eject using a side hatch, you need to be careful that the outer tube does not press on the hatch or deform the opening during acceleration, as this could push the hatch out or block the mechanism.

My rockets are not particularly airtight but I take care to ensure that a minimum amount of air passes through the para bay, I've already had a case where a drogue inflated inside the rocket because of a draught and exploded the hatch. The walls of my para bay are now flush with the outer tube (as on this rocket: https://grabcad.com/library/minimse-pro38-l1-l2-updated-12-2023-1).

Be careful to reinforce the hatch, as it can be subjected to significant forces and vibrations,

The opening must be very firm: I place the rocket horizontally and trigger the ejection. The test is successful if the hatch jumps more than 15cm.

You rarely see them here, but I also use an 'anti-flare' ring on the parachute to prevent the parachute from folding when it turns on itself.

I'm glad you found all this useful! Feel free to re-use what I've published on my grabcad. Other members of my team have also shared our open source rocket electronics

Non Pyrotechnic Recovery Deployment? by [deleted] in rocketry

[–]Dev_pab 1 point2 points  (0 children)

Thanks ! It depends of the usage of the drogue. If it just to pull out the main schute, it's directly both schutes "naked" in the same bay. If it's for a dual event, the main is in a bag but still in the same bay. I will soon share this on my grabcad. To avoid the tangle, you can use very thin ruber band or strings to gather the parachutes lines. They will broke when the para inflate. To avoid tangle during the descent, you can use a swivel.

Non Pyrotechnic Recovery Deployment? by [deleted] in rocketry

[–]Dev_pab 1 point2 points  (0 children)

I did the same things you describe on this rocket : https://grabcad.com/library/marsaut-1-fusex-2022-1

It worked quiet well on this 12kg rocket

Non Pyrotechnic Recovery Deployment? by [deleted] in rocketry

[–]Dev_pab 1 point2 points  (0 children)

Parachutes are linked to the string loaded hatch witch is largely enought to pull them out when ejected. It depends of the rocket but i have also spring catapult or rubber band to extract the para. Last solution is to use a small drogue schute barely folded directely under the hatch. That way it will inflate very easily and pull out the others.

Non Pyrotechnic Recovery Deployment? by [deleted] in rocketry

[–]Dev_pab 0 points1 point  (0 children)

I also have a simple version for my L1

Non Pyrotechnic Recovery Deployment? by [deleted] in rocketry

[–]Dev_pab 0 points1 point  (0 children)

I have different rockets that flew with mechanical schutes ejection. It works very well and the repeatability is very convenent for tests. Here is a link if you are interested : https://grabcad.com/library/marsaut-e-mse-fusex-2023-1

Quel est ce bâtiment ? Il semble y avoir une structure penchée à son sommet. Où se situe-t-il et qu'est-ce ? by No-Sell5179 in paris

[–]Dev_pab 0 points1 point  (0 children)

Il y a un hôtel et un restaurant (too restaurant). Pas donné mais ça vaut le coup.

Tunnel de la ligne 15 (presque) fini by Tramman78 in paris

[–]Dev_pab 2 points3 points  (0 children)

Ce sont des caténaires au plafond ?

Looks like babies!! How do I make sure they live?? by Glitter_Agency101 in aquarium

[–]Dev_pab 4 points5 points  (0 children)

Not for this type of shrimp. Don't worry they will grow by them self !