Blueadventures Posted November 5, 2021 Posted November 5, 2021 a mate is chasing some Dzus male fastenings. 2 at .650 depth and 2 at .550 depth. Does any one have some they can part with and advise price. Thanks Mike
Old Koreelah Posted November 6, 2021 Posted November 6, 2021 I gave up trying to get my Dzuss fasteners from aviation suppliers; they wanted part numbers for every component, and their catalogue bamboozled me. I got mine from rally car suppliers. 1
IBob Posted November 6, 2021 Posted November 6, 2021 Savannah supply homegrown aluminium fasteners that can bind and spread. I replaced all mine with steel Dzus from Aircraft Spruce: Model Cat # Quantity 121J-540-Z3C AJ5-40 13 121J-545-Z3C AJ5-45 3 That includes a couple of spares, though I have learnt to be really careful taking them out when on grass. 1
facthunter Posted November 7, 2021 Posted November 7, 2021 You shouldn't work on planes when you are ON grass. Nev 2 1 3
IBob Posted November 7, 2021 Posted November 7, 2021 Here is the Aircraft Spruce page that spells out the dimensions: https://www.aircraftspruce.com/catalog/hapages/dzus.php Note they are measured from the head to the spring bar they attach to. That's the -40 and -45 of the number, which are 400 and 450thou respectively. 1
IBob Posted November 7, 2021 Posted November 7, 2021 11 minutes ago, facthunter said: You shouldn't work on planes when you are ON grass. Nev It's also challenging for those of us with more than the usual pair of thumbs, Nev.....) 1
Blueadventures Posted November 7, 2021 Author Posted November 7, 2021 Thanks for info. My mate chose to place cowl on outside of fuselage; so a little harder. The side top to lower is all good; but the corner overlap needs longer than the .50 size; needs an extra 3mm so needs the .625 so he will get some .650 size (2 needed ex Adelaide so 10 to 14 days delivery) I suggest he lengthens to of the .40 size, drill tap thread set a counter sunk metal thread into the fastening then cut through and add a lengthening collar of 3mm plus the cut off wheel thickness and loctite together. Will allow trial fit while waiting for new ones. I had things on so up to him to decide. If I fitted one again to outside I would fit the top piece; then cut the lower piece down its middle then mount to front fuse skin side and fit side top to lower dzus fastenings and resin/ mat the lower half join gap. (No worries to do this perfect and whit correct resin and mat layup. Thanks for info and was just trying to get a couple of correct lenght Dzus by end of week if possible. Cheers.
Blueadventures Posted November 7, 2021 Author Posted November 7, 2021 16 minutes ago, facthunter said: You shouldn't work on planes when you are ON grass. Nev Or ICE especially in winter time. 🙃
IBob Posted November 7, 2021 Posted November 7, 2021 PS for anyone building: due to variations in cowl thickness, some adjustment of the individual fasteners will probably be required. I did this by reworking (okay, bending) the springs, and in some cases by packing under the spring where it is attached to the inner cowl. As with all cowl fitting, this really needs to be done before the paint. 1
Blueadventures Posted November 7, 2021 Author Posted November 7, 2021 1 minute ago, IBob said: PS for anyone building: due to variations in cowl thickness, some adjustment of the individual fasteners will probably be required. I did this by reworking (okay, bending) the springs, and in some cases by packing under the spring where it is attached to the inner cowl. As with all cowl fitting, this really needs to be done before the paint. Plus take the time needed.
IBob Posted November 7, 2021 Posted November 7, 2021 Blueadventures, my cowl is inside and I would do the same again. The purists would say it is less streamlined, but this is not a streamlined aircraft and I can't see the overlap making any difference. I also like the idea that my cowling is more likely to stay with the aircraft, tucked in as it is......) My understanding is that it used to be a struggle to fit some cowls this way, but for me it went very easily. Maybe this is a feature of the XL and S, probably also it is due to the corrugated steel hoses that allow very tight smooth bends without flattening.
spacesailor Posted November 7, 2021 Posted November 7, 2021 Any chance someone would have two complete Dzus fasteners of the ' smallest size ' out there, to join two thin alloy parts. ( not structural ). I,m using two 3/32" nuts & bolts at the moment. The sizes have me bamboozled spacesailor
Blueadventures Posted November 7, 2021 Author Posted November 7, 2021 1 hour ago, spacesailor said: Any chance someone would have two complete Dzus fasteners of the ' smallest size ' out there, to join two thin alloy parts. ( not structural ). I,m using two 3/32" nuts & bolts at the moment. The sizes have me bamboozled spacesailor Camlocs are worth considering for the job, they are my choice.
spacesailor Posted November 7, 2021 Posted November 7, 2021 (edited) Blueadventures, I checked them out !, ( camlocs ) But The same thing aplies. Even in their literature it says ( can,t find that site now, so as l remember it ) " we don,t use size but serial numbers ". So to fasten a ten-thou" inspection door closed l use a couple of nuts & bolts. And some are in French ! The rest American. spacesailor Edited November 7, 2021 by spacesailor Missed word
IBob Posted November 8, 2021 Posted November 8, 2021 Give us a clearer idea of what you are trying to do Spacesailor. My aircraftt has Dzus for the fg cowlings (higher load, greater weight) and camlocs for oil inspection and belly hatches. Different fasteners will be more appropriate in different applications. In all cases there will be lookup tables identifying the sizes and how they are measured. It's just you sometimes have to do your own homework finding the appropriate table. And you have to know how they are measured, or you're just guessing. I would guess Aircraft Spruce only take orders for part numbers to avoid arguments with folk who guessed, then didn't get what they wanted. Camloc info is here: scroll to the bottom and it says how to measure for them: https://www.aircraftspruce.com/catalog/hapages/camloc4002.php It doesn't look as if they carry the shortest size. If it helps, the shortest (slotted head, undercut) Dzus is the AJ3-25 for 3/16" diameter or AJ4-25 for 1/4" diamrter. (So the first part of the number is diameter in 16ths and the last part is the length in decimal....gotta love this stuff!) They have a length of .25 or 1/4". If they are still too long (or if you have to buy the next size up which is AJ3-30 or AJ4-30) all you do is pack and/or rework the spring they get hold of.
spacesailor Posted November 8, 2021 Posted November 8, 2021 As the ' fuelcap cover is 0.8mm & the base is the same !. ( just went out & measured it ). Then 2 mm thickness of material, is a bit small. The reason, l asked for a couple of the smallest, will give me an idea how Big the smallest is. There are bigger RC models than the HummelBird, And with bigger engines. spacesailor
Blueadventures Posted November 8, 2021 Author Posted November 8, 2021 22 minutes ago, spacesailor said: As the ' fuelcap cover is 0.8mm & the base is the same !. ( just went out & measured it ). Then 2 mm thickness of material, is a bit small. The reason, l asked for a couple of the smallest, will give me an idea how Big the smallest is. There are bigger RC models than the HummelBird, And with bigger engines. spacesailor Camloc -4 will fit and may be even a -3 (I'd say a -3 will do the job also can get with either a screw driver slot or a wing nut type piece attached.) I also place a thin nylon washer under mine to protect the fibreglass. 1
IBob Posted November 8, 2021 Posted November 8, 2021 It does sound like the Camloc would be your better option. That's what I have on my oil inspection hatch, which is opened every preflight. I think they are better suited to that sort of constant use. 1
Blueadventures Posted November 8, 2021 Author Posted November 8, 2021 1 hour ago, IBob said: It does sound like the Camloc would be your better option. That's what I have on my oil inspection hatch, which is opened every preflight. I think they are better suited to that sort of constant use. Agree Bob; thinking its a small hatch so a small lock like camloc would suit and its receptacle is small in size as well.
Methusala Posted November 9, 2021 Posted November 9, 2021 I like Jabiru idea... hinged cover with magnet to keep it shut. Oil dipstick cover on top cowl.
spacesailor Posted November 9, 2021 Posted November 9, 2021 Jabs magnetic trick should stick !. BUT The compass is much closer on a HumelBird, I,m saying 5 or 6 inches. After all the length is 14' ( feet ). I guess l,ll have to keep screwing away with thoe two 3/32 bolts. It,s just the thought of dropping one ( or both ) in the airfield grass !, never to be found again. spacesailor
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