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| Jet Aircraft Discuss Jets in Canada |
Topic Review (Newest First)
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| 05-31-2023 07:48 PM | |||
| cicopo |
Re: Re-starting Avro Arrow build Welcome back John. A warning though; neither one of us is getting younger (in case you've forgot). Nice to see you back at it. |
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| 05-31-2023 07:14 PM | |||
| DarthAnal |
Re: Re-starting Avro Arrow build Welcome back, John! Going to have to get things set up on my FMS trainer and get out to the field and try to fly, if I can get the time from not having to help my wife, do the shopping and cooking and all sorts of lawn maintenance. |
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| 05-28-2023 10:37 AM | |||
| Dutkoski |
Re: Re-starting Avro Arrow build Good morning guys, I know this build has been painfully slow, but I’m hoping to get back at it, finances permitting. I’ve come to the decision that although this model is intended to be powered by turbines, this initial prototype will not. My pockets are not deep enough to risk the financial loss of two turbines and associated equipment in the possibility of an unsuccessful maiden flight. So, the decision has been made to power the prototype with two 120 mm EDF’s with Mega motors on 12S battery packs. I already have the EDF’s, motors, one Castle Creation 160 amp ESC and one 12S battery pack. I intend to use 8 - 6S battery packs, gang them in two sets of 4 batteries in series to represent two 12S battery packs. I want to use batteries that will have more than 1000 mah capacity, so batteries in the 6200 mah capacity will be able to give me a combined capacity of 12,400 mah capacity. So, last week, I made the trailing section of the left wing, this is to make this section accurately so I can fit the control surfaces master plugs to it. This will give me the opportunity to get a perfect fit. Also, the spar locations have been laid out, signified by the green tape. Discussions have been over the use of tube spars or traditional spars. Due to the limited space and the fact the retract mounts will need to be attached to the main spar, tube style spars will not work, plus they take up too much space. So, it looks like I’ll be making moulds to make carbon fibre spars or use aircraft grade aluminum or a composite combination of both materials. Instead of using the thin green foam to stiffen the wing skin, like pretty much all modern manufacturers use, I won’t. I ordered a lot of 1/16” balsa from Model Aviation Products in Manitoba, very reasonably priced which was very nice. I laminate the balsa to the fibreglass skin via vacuum bagging, I get perfect adhesion with no air bubbles. Plus, the vacuum bagging process sucks the resin into the balsa, creating a really hard surface to build on. Also, this method is a lot stronger than the foam method, and I like things to be strong. Attached is a picture of one of the wings from my smaller Avro Arrow using this method. So, again guys, sorry for this painfully slow build, I’m hoping to get it moving along more quickly now. |
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| 04-29-2023 04:11 PM | |||
| DarthAnal |
Re: Re-starting Avro Arrow build Going to have to dig out the instruction sheets (by Jetset44) and check how the stabilator setup is set up, of deconstruct the T-38 from years gone by. |
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| 04-26-2023 05:52 PM | |||
| DarthAnal |
Re: Re-starting Avro Arrow build Looks like I'll be revising my cruciform Avro Arrow from years ago by rehashing the design similar to how Otto Deffinger (sic) did models of the F-15 and F-22 using Home Depot half-inch foam. prop in slot and ROG/slider. |
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| 04-26-2023 02:45 PM | |||
| boostfreak |
Re: Re-starting Avro Arrow build I read through the whole thread with excitement. Really hope this one reaches the finish line one day. |
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| 02-06-2023 08:50 AM | |||
| DarthAnal |
Re: Re-starting Avro Arrow build Almost a year without a posting, John! Guess that you're probably Down South in California or Florida for the winter. Two years in retirement for me and wtoll nothing moving forward. Wish list is either a copy of the first Dutkoski Arrow or the Mig-25 in pusher format, or a twin-engine version of the Unionville Club Coupe Got to get rid of the sheets of half-inch pink extruded styrene somehow. Also, I am plowing through you threads, looking for ideas like foam ribs and construction of the Arrow and Mig in sheet foam. |
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| 02-16-2022 02:11 PM | |||
| Dutkoski |
Re: Re-starting Avro Arrow build Yes Len, the product is called cabosil, it has more strength than micro balloons. Mixed with resin until it’s like a loose paste so it won’t run. The best I can describe it, finely chopped micro fibres. And, you should wear at least an N-95 mask when working with it, fibres will float in the air and they are not good for the lungs. I only use this when making parts though, not when making moulds. |
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| 02-15-2022 01:03 PM | |||
| stegl |
Re: Re-starting Avro Arrow build Quote:
Quote:
Fir sharp corners , I believe Steve Webber used something like microballons or similar to fill the sharp curves then used a layer of light (how light ? Don’t know) glass cloth on top , before it set up. Worked well with his cowls and wheel pants and kept weight addition to a minimum . |
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| 02-15-2022 10:15 AM | |||
| Dutkoski |
Re: Re-starting Avro Arrow build Just a quick update. Things have been pretty slow for this project, sorta loosing steam as they say. But, I’m still picking away at it. I’m down south for the winter and brought the control surface masters with me. My intention was to finish them up and make the moulds for tgem, but my brother-in-law’s garage is not conducive to messy fiberglass projects, it’s spotlessly clean. So, I have to satisfy myself by only correcting some issues that developed with the elevators and ailerons, mainly, a bit of warpage along the trailing edges. Using a flat shelf as a mould, I first made a fibreglass skin out of 2.3 oz and 6 oz cloth, trimmed it to size, a quick sanding to rough up the surface and with polyester resin, bonded the control surface to the wing skin that is still attached to the shelf. I then pull small sand bags on the control surface and then a couple of heavy paver bricks. After a few hours, removed the weight and applied the same fibreglass cloth to the exposed side. After this had cured, trimed it again, then carefully pried the control surface off the shelf. The results were very satisfactory. Now, once I get home, I’ll finish up the control surfaces and make the moulds. So, these and one set of wheel well door moulds should be the last of the fibreglass moulds. 
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