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Why not a simple sheet metal riveted enclosure ? - cheap - easy to do stress calculations - easy to modify if necessary - very simple to add local re-enforcements, stringer, angles etc.... I mean we have been building rivet sealed airframes for more then 80 years !

I am very surprised to see that you are very concerned about using a Aerospace grade type bolt but the thing you are bolting down, the vibration mount is of no concern an can be modified without the manufactures approval. If the vibration mount has metrical screw threads I would guess that this...

I think I have to do a DIY KWE course when the work pressure is lower ! Can you give me a short course ? [rednose] and or a bit more which exact function I have to use, this because I tried and failed..............

I received from a customer a double contoured part with around 200 countersunk holes in them. I am asked to change all holes to an other diameter and without countersunk. Is there a way to link all these 200 holes to the same set of parameters? Offcourse without linking every hole separately...

I don't think the question is why the Aerospace standard is not to install Cress on CFRP, it's more that Cress is overall not the preferred fastener material because it is weaker then it's steel equivalent. So the steel variant is smaller / lighter than it's Cress equivalent. Be careful with...

Thanks all for the comments. Some more data, The 0.008" freerun is the measured as a worse case scenario on the actual pump which is worn out, so yes this is way too big. Still this worn out pump during testing puts out around 500 Psi. On the pumphouse the bore is measured ( undamaged area )...

Thanks Ted, The tolerances you mention on the Shaft to Bushing are almost identical to the ones I measured from the existing pump. The free run tolerance on the geartip - pump house seam to me a bid close. The problem here is that the housing is made from aluminum 2024, so any contact between...

Why don't you use this type : Then find a spring which bottoms out out your desired maximum force and place this between the body and the thumbscrew. If you can pull the panel without the springs bottoming out you know you are within the limit. You can even measure the force with a feeler...

Hello All, I am trying to reverse engineer a hydraulic pump used on a 1944 warbird. The pump we have has been damaged and only delivers around 500 psi were it should be 3000 psi. The following data : Hydraulic Pump - Prop Governor Max RPM = 6800 Max Pressure = 3000 PSI Fluid =...

Thanks Azreal, [upsidedown] Think I have to put my nose in the study books. [smarty] This is completely new material to me.

Azreal, can you explain a little further how do I use metadata instantiaton ( couldn't find it on the web ) and where can I find it in Catia. I already had the thought that you need published elements.

The Youtube exactly shows how not to do it ! Look at time 5.11 Catia gives the following warning : The reference of the component Rib2.1 is a new version of a contexed component to be able to edit it yo must -either isolate it -either define its new context Further look in the external...

I have a Catpart in an assembly with external links. Now I want to copy / duplicate this part to create a same part with the same links but lets say 10 inch to the left. For example a airplane metal rib, I have created rib no 1 with external links to outside surface of the wing. Now I want to...

Not much has changed on subsonic propellor design since WW2. The old NACA reports are still valid. See : http://naca.central.cranfield.ac.uk/reports/1938/naca-report-640.pdf Or : http://naca.central.cranfield.ac.uk/reports/1938/naca-report-642.pdf ( Propelor efficiency in the presence of a...

Fokker aircaft started building bondeded aircaft structures in the 1950's . To check the bonding they developed the : Fokker bond tester. Easy to find on the internet So yes the system is around a while...... Pim

Thanks both RB1957 and spider007 Remark on RB1957. When you speak about compression loads on a cable, I think that what you mean is create a FEM model, put pre-tension in the system and then look with maximum control loads in the system if the none actuated cable loads go to zero or...

This project ( Fokker G1 Replica ) is not a restoration project. It's a reverse engineering effort using only photographs and surviving stress reports. Basically I am designing an aircaft with the difficulty that it has to look a certain way. Pim Pouw

Hello, I am working on the design of control cables of a mid size twin engine aircraft. I have a hard time finding data such as : advisible unsupported cable lenghts / diameter cable advisible cable tension during rigging operation advisible minimum distance between cables / structure a...

Thanks both for the info, Designing and buiding a replica aircraft have nothing to do with common sense. The engines and props ( sound ) have to look as close to the original as possible. The P&W is good in this sense because it can run the same 3 bladed counterweigth ajustable prop of the same...

I am working on the reverse engineering of a WW2 fighter. It's a Fokker G1 ( Netherlands - 1938 ). Originally this aircraft had Bristol engines, because of the difficulty to obtain and keep them running I am looking as an alternate the Pratt & Whitney R1340 S3H1-G. This engine is also used on...