If you open your map in the editor.
Launch the editor and open your map. Find your ship and then double click on the hull to bring up the properties page. You will see a field labeled 'HP'. I set it to 50k after seeing how low mine was getting from accidental smacks with hammers. You can then 'File>Save As' and type in the map name you used to push the changes to your playable game. Make sure you wait around for the save finished message to show up in chat or the changes won't keep. This would probably be a good time to right click on the hull of the ship and save it as a composition! A ship I had became unsteerable after placing a broken computer on it and having it saved as a composition saved the day.
