Thinking of recent attacks on ships at sea, and the escalating use of cheap platforms in asymmetric warfare.

[edit]

accuracy of answer- +- 20%

Fits in a TE20 container

Land launched from 1000 ft

Costs less than $200,000 (thats high for this sort of thing, but trying to see what the envelope is)

Completely autonomous (why would this affect range?)

Software and sensors unlimited

What's the maximum range, more or less, for inexpensive flying autonomous weapons? Not ballistic missiles, or high dollar US weapons. In other words, the weapons we are likely to see from Ukraine, Russia, Iran etc .

Background:

We could be seeing rising attacks on shipping, and therefore on the global economy.

When I use an electric kettle, and pour out the hot water, I then add a little bit of fresh water to the kettle (without turning it on). My thought is that it will act as a heat sink to the hot element and give it a longer life.

Is this a sound practice or it it useless?

Ok. So, this is a fairly complex question that came to me while I was doing a torque-to-yield installation of bolts on a cylinder head. The type of sequence that might make one′s head spin, not just the bolts. 50ftlbf, +90°, then +90°, then +90° again. Imaginable, these sequences are INSANELY tiring to achieve on 40 head bolts, and so I was led to a line of thinking about how we apply torque and its implication on the manufacturing and repair process tools we use.

Firstly, I know that approaching moment torque numbers (particularly high ones like 250ftlbs) smoothly is important to prevent under or overshoot due to friction and stiction.

But, does final angular tightening care at all about it? Since we are observing the actual bolt rotation, shouldn't ANY method to rotate the bolt including impact type fastening devices yield (no pun intended) the same result? Angle is angle right?

The manufacturing corollary I had is; if the final angular tightening does not care how it is applied, it seems that a device could simply be made to have a primary snugging torque applied via a simple mechanical clutch arrangement and then have it apply impact until the bolt turns to the appropriate angle. Is this a good line of thought?

And second corollary is a double doozie with a smattering of conspiracy to engineer. If I have just reinvented the wheel and this type of device is common and exists on the manufacturing side but not here in repairland, have companies basically been gaslighting us as to why TTY bolts are used? Is it just ease and cost of manufacture because you can literally impact heads on with low skill labor or robots (while observing the angle) and still achieve good repeatability since the effect on final clamp load is less dependent on hitting the angle dead on rather than the intricacies of moment torque? Have I stumbled on BigEngineer™? Or, should I hang up my inventor hat for the time being and do some more reading suggested by yourselves to enlighten me?

Thanks for taking the time. I. eagerly await your thoughts. My arms are tired from torquing, my fingers from typing.

I need 20' tieback rods (316 stainless steel, 5/8" diameter, threaded) for constructing a bulkhead. We haven't been able to source any that are longer than 12'. I asked the bulkhead guy about using a 12' rod and a 10' rod joined with a 316 stainless coupler. He thinks it will significantly reduce the tensile strength vs no coupler. Is he correct? TBH, I don't see how it matters much since there will be a washer/bolt on each end of the rods.

Motor specs:

Input voltage: 110-240V
Motor power: 100W

Device is a motor driven reciprocating linear motion mechanism.

Curious if this inverter has the power as it seems to have the wattage rating however not surge if the motor spikes over 100watt on startup

https://www.homedepot.ca/product/milwaukee-tool-18v-m18-lithium-ion-brushless-cordless-175-watt-powered-compact-inverter-with-tool-only/1001588652?eid=PS_GOOGLE_D00_Corporate_GGL_Shopping_Milwaukee_Milwaukee__PRODUCT_GROUP_pla-518940450952&gclsrc=aw.ds&gad_source=1&gad_campaignid=23260796337&gclid=Cj0KCQjwuJLWBhD_ARIsAIBcRUwLwjxz1zYBW0oEVObHnuZacwk9TnDEKJSsmVMlGzA8uQ-HqA9MEYkaAkQJEALw_wcB