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Hello everybody, I'm running into a cooling problem at work on our UAV, essentially the engine is running too hot and I've been tasked to find a solution. At the moment we have an automotive configuration with the radiator in front of the aircraft and an axial fan right behind the radiator that...

@rb1957 "Transferring shear without friction is an analysis assumption. Of course there is friction in a clamped up joint. You could possibly consider serrated plates (but I doubt I would). Your high design loads come from extreme situations (like failure torque) which could overload the...

Just to add to the discussion of where to use close tolerance bolt, from the FAA AC 43.13-1B: On paragraph 7-44: "CLOSE-TOLERANCE BOLTS are used in applications where two parts bolted together are subject to severe load reversals and vibration. Because of the interference fit, this type of bolt...

Hello and thanks again for your answers, I think I need to clarify a couple of things. 1 - Many design choices where done before I joined the project. Initially they used 6 close tolerance bolt to secure the engine assembly on the main frame. I "compromised" by proposing to use only two close...

Thanks all for your answers. Reply here below. @EdStainless That's almost what I'm doing. Of the 6 1/4" bolts 2 are close tolerance to position the engine assembly on the frame and 4 are clearance holes. This way I provide positioning and all 6 of them provide clamping. @BrianE22 I'm not...

Hello everybody, I'm designing a medium size drone for maritime applications and having a bit of trouble with designing the bolted connection between main frame and engine.... The requirement from the customer is that: - the engine should be easy and quick to remove. - any engine must be able...

@Burunduk No real justification. Just "we've always done it like that". I tried to tell them gd&t is far better and more actual. Is there an obligation for a company to use gd&t that you know of? Or is it just considered best practice?

Hi all, thanks all for your answers,even for those angry with the design department for applying too tight tolerances ;-) Let me provide an example: On this component (dimensions in inches sorry) we assemble a carbon fiber duct which basically is a duct (woooaaaAA) with a flange that is...

Hello everybody, I'm a mechanical design engineer in a aerospace company in Europe. First post here, hope everybody is well during this uncertain times. Well, as the post subject suggest I'm having some issues in my company with other departments (WHHAAAAAAAT?!?!? REALLY??!?!? NEVER HEARD OF...