skyhawk174 Posted February 18, 2019 Share Posted February 18, 2019 23 hours ago, Colin K said: Actually, the SAC gear would be appropriate for a CF-18. All that needs to be added, is the correct shock absorber. I used SAC gear on a 32nd CF-18B build, many years ago (article is in R/T 34-4). What I did for the shock strut was assemble the kit parts, then cut off the ends that attach to the gear legs. Then, I made the new strut out of plastic tubing, glued the attachment points to either end, and done! Yeah that is what I meant. Forgot to elaborate. Now that I think about it I wonder why they did that? Quote Link to post Share on other sites
ALF18 Posted February 18, 2019 Author Share Posted February 18, 2019 11 hours ago, skyhawk174 said: Yeah that is what I meant. Forgot to elaborate. Now that I think about it I wonder why they did that? Simple. Only Canadian F/A-18s have the smaller, inverted shock absorber. All other Hornets have the SAC-gear style strut. ALF Quote Link to post Share on other sites
AlienFrogModeller Posted February 18, 2019 Share Posted February 18, 2019 13 hours ago, skyhawk174 said: Yeah that is what I meant. Forgot to elaborate. Now that I think about it I wonder why they did that? The current Hornet gear was an option when we bought them. It was designed for field landing and it suited the CAF needs. It would only require 17 ft/sec drop to meet our type of landing. The other type was for carrier style landings and are abit bigger in the circumference allowing for a greater than 17 ft/sec drop for carrier Ops. When the US Navy was still having issues, the redesigned MLG Oleo (and other design changes not obvious to the naked eye) involved a larger diameter and inverted style. Inverted due to the size increase and the ability to fold up inside the airframe. Canada did not op to get this versions the cost was ONE of the mitigating factors. Cheers AFM Quote Link to post Share on other sites
ALF18 Posted February 19, 2019 Author Share Posted February 19, 2019 I'd like to thank AFM and Danny for both providing some great information about CIT and landing gear. The airframe is now coming together. The mount for the Sniper pod goes on station 4, of course (because it is the one station with the IR cooling plumbing, and possibly electrical hookups that I am not so aware of). The resin part is beautiful for that mount. I have also placed the "fat pylon" at the bottom right of the picture. The resin detail is superb on that pylon. Pretty good fit for an after-market part. Fat pylon, all trimmed of its casting block. This pylon can house a jammer which is unique to the CF-18 (ALQ-162). It is usually installed on station 2 or 8; putting a pylon that is full of wiggly-amps onto station 3 or 7 with fuel connections would NOT be a good idea! Option: resin or kit part. The kit part is in the foreground, and darker in colour. The resin part is harder to fit, because of where the casting block was. The kit part fits beautifully, of course. On careful examination, the only difference I can see is the small detail behind the HUD projector. The rest looks pretty much identical to me. I'm going with the kit part. I've installed the tails. Still to come are the little braces on the inside bottom; the kit comes with these. One thing I love about the A+/B+ kit I'm using is that there is no need to use an aftermarket resin tail, nor do I have to do major surgery on a C/D tail. Much cleaner, and looks great. ALF Quote Link to post Share on other sites
Jamie Cheslo Posted February 19, 2019 Share Posted February 19, 2019 Outstanding! I am following this build with great interest and awe. Keep the progress pictures coming! Quote Link to post Share on other sites
ALF18 Posted February 19, 2019 Author Share Posted February 19, 2019 12 hours ago, Jamie Cheslo said: Outstanding! I am following this build with great interest and awe. Keep the progress pictures coming! Thanks! ALF Quote Link to post Share on other sites
skyhawk174 Posted February 19, 2019 Share Posted February 19, 2019 (edited) Just wonderful stuff Alf. This will be my bible when I start my CF-18 which is very tempting after seeing your build. A lot of my fears are reduced seeing what you are doing. My biggest fear once I get past the build portion would be the paint. To get that beat up worn look is an art I think. However I could do one as if it just came out of the maintenance with minimal flight time. Hey I have the kit so at least half way there 😀 Edited February 19, 2019 by skyhawk174 Quote Link to post Share on other sites
AlienFrogModeller Posted February 20, 2019 Share Posted February 20, 2019 SO nice to see this one come together. I have two in my stash...can't wait to start. I have too many on the go right now....trying to finish this F-100 for a group build for the Nats, then my Boss 302, a 416 Sqn Spit, A 429 Sqn C-17...ugh. Cheers AFM Quote Link to post Share on other sites
ALF18 Posted February 20, 2019 Author Share Posted February 20, 2019 20 hours ago, skyhawk174 said: Just wonderful stuff Alf. This will be my bible when I start my CF-18 which is very tempting after seeing your build. A lot of my fears are reduced seeing what you are doing. My biggest fear once I get past the build portion would be the paint. To get that beat up worn look is an art I think. However I could do one as if it just came out of the maintenance with minimal flight time. Hey I have the kit so at least half way there 😀 This is a fantastic kit. I encourage you to "just do it." I'm happy to see that my explanations (and sometimes mea culpas when I make mistakes) can help others to build this and other kits I attempt. Don't worry about the paint; I have some easy ways to weather it that only involve a pencil! May not be perfect, but it's a technique that is very forgiving. Stick around to when I get to that point. ALF 14 hours ago, AlienFrogModeller said: SO nice to see this one come together. I have two in my stash...can't wait to start. I have too many on the go right now....trying to finish this F-100 for a group build for the Nats, then my Boss 302, a 416 Sqn Spit, A 429 Sqn C-17...ugh. Cheers AFM LOL! You can do it all. Just abandon everything else in your life. ALF Quote Link to post Share on other sites
ALF18 Posted February 20, 2019 Author Share Posted February 20, 2019 Finishing up details on the structure. Now it's time for the 3 little brackets that reduce the tail flutter and vibration problems we had early on. When I first flew the aircraft, it did not have the LEX fences. One of the advantages of the Hornet is it can fly at extremely high angles of attack. To put it in perspective, most conventional aircraft stall, and shudder and drop the nose to regain flying speed, at angles of attack in the 12 to 15 degree range. Supersonic fighters, like the F-5, F18, F-16, etc, can exceed that angle of attack without doing the regular shudder and nose drop; they will shake a bit but allow the pilot to maintain a nose-high, very high AOA (angle of attack) flight condition. The F-16 is limited to about 25 degrees AOA, though, with a flight control limiter. The Hornet does not have any such limit. Optimal manoeuvring is at 15 AOA, or as my instructor at 410 Sqn used to say, "light tickle" in the seat of the pants. Beyond that, the aircraft may slowly lose energy unless afterburners are used. At 25 AOA, it is doing its minimum radius turn that can be sustained, and the aircraft shakes a lot more. When you really want to manoeuvre hard, like "cashing in" all of your energy to point the nose and shoot, you can pull 35 or more degrees AOA, and that's when my instructor said "the elephants start jumping on the wings." We used to practise slow flight at 25 AOA at about 15,000 feet, without afterburner, in level flight, to get the feel and precision required to properly manoeuvre the aircraft. The elephants have only started to stomp a bit (i.e. the aircraft shakes quite a bit, but not to the point your fillings come loose). It was when my instructor said to look at the tails that I kind of flipped out. The tops of the tails were flapping in and out like leaves in a thunderstorm. I estimate the tops of the tails were moving at least 6 to 9 inches, maybe more. Turns out that the attachment points of the tails were subject to cracking as a result. All of this was caused by vortices coming from the leading edge extensions (LEX). After several iterations, the coke-bottle glasses types came up with two fixes: LEX fences to break the intensity of the vortices, and the braces to stiffen the bases of the tails. Later production models than our CF-18s (i.e. F/A-18Cs) did not have the little braces, because they had changed the design of the tail attachment points. All this to say that the CF-18s, after about 1989, had the 3 braces and LEX fences installed. Before that, neither modification was present, so you are free to model the era you wish. When they were adding the LEX fences, we were concerned about the potential impact on performance they might have, but turns out it was imperceptible. There are 3 braces, small to larger, on the sprues. Note that they have little tabs that stick out. Some versions of this kit have little recesses that those nubs fit into; this particular boxing doesn't have it, which is curious because normally jets of this era would have the braces. I chopped those little nubs off. I double-checked to see which one was largest, the aft or foremost one. This picture of a demo jet, taken by the Wing imaging section at Bagotville, clearly shows the largest braces at the rear. Nice of them to paint them dark blue to make them stand out... Thanks, Jim Beliveau! Here's what they look like, installed. More soon! ALF Quote Link to post Share on other sites
Jamie Cheslo Posted February 21, 2019 Share Posted February 21, 2019 I am learning more about the CF-18 from this build thread than I could have imagined possible! Great work and a great shot of that demo jet! Quote Link to post Share on other sites
my favs are F`s Posted February 21, 2019 Share Posted February 21, 2019 Awesome build so far! Just a hint: maybe these braces need some thinning. If they are like that with so huge flat sides, they would interupt the airflow quite a bit. 😉 Quote Link to post Share on other sites
Specter1075 Posted February 21, 2019 Share Posted February 21, 2019 40 minutes ago, my favs are F`s said: Awesome build so far! Just a hint: maybe these braces need some thinning. If they are like that with so huge flat sides, they would interupt the airflow quite a bit. 😉 I like how you ignored the majority of his post, where he explains the bracket's purpose using his own experience as a CF-18 pilot, to write something condescending. 😉 Quote Link to post Share on other sites
my favs are F`s Posted February 21, 2019 Share Posted February 21, 2019 1 hour ago, Specter1075 said: I like how you ignored the majority of his post, . . . 😉 Nope I'm not. It's an awesome read, no doubt about it. The three braces are there to strengthen the stabilizers no doubt about it either. My point was that I would have thin them just a little bit so they don't look so massive. We all know how important is every rivet or fastener to be flush with fuselage because of the airflow,... same thing here. Actually I searched for angled images of these braces to see how really thick they are but couldnt find any. Neverheless, it's just my taste and opinion about the thickness of these details. Quote Link to post Share on other sites
Specter1075 Posted February 21, 2019 Share Posted February 21, 2019 Fair enough. It just reads a bit differently than you mean it at first glance. Quote Link to post Share on other sites
AX 365 Posted February 23, 2019 Share Posted February 23, 2019 Great progress ALF. As usual, I enjoy the first hand, personal experience commentary. You help bring your builds to life. Keep it up chum. Mike Quote Link to post Share on other sites
ALF18 Posted April 10, 2019 Author Share Posted April 10, 2019 On 2/21/2019 at 1:14 AM, my favs are F`s said: Awesome build so far! Just a hint: maybe these braces need some thinning. If they are like that with so huge flat sides, they would interupt the airflow quite a bit. 😉 I beg to differ with you, dude. The fatigue life mods they made to the CF-18 were quite obtrusive, including LEX fences with huge bolts and these brackets. Not a great picture, but here's how thick they are: Here's a picture I took of my wingman on the way back from Greenwood to Bagotville. You can see the shadows are quite pronounced on the brackets. Believe me, they are fairly thick. ALF Quote Link to post Share on other sites
AlienFrogModeller Posted April 10, 2019 Share Posted April 10, 2019 7 minutes ago, ALF18 said: I beg to differ with you, dude. The fatigue life mods they made to the CF-18 were quite obtrusive, including LEX fences with huge bolts and these brackets. Not a great picture, but here's how thick they are: ALF I cannot count how many times I have tripped on those pieces...or used them to get that extra little height to check the vert stabs. Cheers Quote Link to post Share on other sites
ALF18 Posted April 10, 2019 Author Share Posted April 10, 2019 41 minutes ago, AlienFrogModeller said: I cannot count how many times I have tripped on those pieces...or used them to get that extra little height to check the vert stabs. Cheers Why didn't you file them down... ? 😈 Quote Link to post Share on other sites
chuck540z3 Posted April 11, 2019 Share Posted April 11, 2019 Great job Dan. And here's another pic to back up some of the fatigue life mods on the dorsal surface. Cheers, Chuck Quote Link to post Share on other sites
AlienFrogModeller Posted April 11, 2019 Share Posted April 11, 2019 23 hours ago, ALF18 said: Why didn't you file them down... ? 😈 Nah...getting promoted was easier, now I watch others. Remember, don't lift with your back....lift with your corporals. Cheers Quote Link to post Share on other sites
Alternative 4 Posted April 13, 2019 Share Posted April 13, 2019 The dude at the back on that photo is really creepy!! Quote Link to post Share on other sites
ALF18 Posted April 17, 2019 Author Share Posted April 17, 2019 On 4/10/2019 at 8:49 PM, chuck540z3 said: Great job Dan. And here's another pic to back up some of the fatigue life mods on the dorsal surface. Cheers, Chuck Thanks, Chuck. Fantastic ref pic. On 4/11/2019 at 1:23 PM, AlienFrogModeller said: Nah...getting promoted was easier, now I watch others. Remember, don't lift with your back....lift with your corporals. Cheers Love that sentiment. Lift with your corporals. On 4/13/2019 at 5:10 AM, Alternative 4 said: The dude at the back on that photo is really creepy!! Although this is an easy "hit out of the park" setup, I'm not sure if my buddy Chuck540Z knows him... so I will reserve comment! Finally some progress updates here. I have been doing some steady work after taking a break for about a month (family issues, Disney World trip, general winter blues). The pics and text in the next few posts represent a couple month's work. I started to finish off the exterior detail. Here I have installed the flap guides (the four curved pieces attaching the tops of the flaps and ailerons to the wing). Although they will be very hard to see, they will help to support the fillet part (technical term I just dusted off, and may have used improperly) between the wing fixed section and the rear control surfaces. I have installed the resin (fat) pylon, and the other 3 underwing pylons, as well as the centreline pylon. I've also added the ECM bumps under the intakes. They are not easily identifiable in the Academy instructions, but they do work nicely. One is longer than the other, and installed inboard of the chaff/flare dispenser, and the other one is shorter and directly in front of the dispenser. The gaps are a little obvious, so I will fill some areas around the intake lips and the splitter plates. This is the kit's GPS dome. Lately, the aircraft have been updated to include a larger bump that is further forward, but I don't have a satisfactory part for that. Flap fillets installed. These are the LAU 7 missile rails that go on the wingtips. The first time I built this kit, ages ago, I trimmed the extra sprue off them, and left the unassembled parts aside. I then made the mistake of gluing two together that did not have the little locating pins. I then walked away, and tried gluing the other parts together later... but they wouldn't go together because of the pins. I also found that the little slats did not locate properly into the wing leading edge. Finally, I realized I had glued the wrong parts together, and fixed the problem. When put together properly, they have a clever way of sliding into the wingtip. Assembled rails. This is what it looks like when properly put together. The little slat sticking up locates into a slot in the wingtip. Here's what it looks like when dry-fit in place. I leave the rails off until after main painting is done, because the rails are the lower light grey colour, and I want to avoid having to mask them when painting the top medium grey. More soon. ALF Quote Link to post Share on other sites
ALF18 Posted April 17, 2019 Author Share Posted April 17, 2019 I have used a couple of the after-market strengthening plates on the outboard portions of the two vertical stabilizers. Most aircraft have 3 or 4 of these (one either side of each v-stab), but frankly I don't care enough to check what this particular tail number may have had at any given time. These started to show up about 10 to 15 years ago as fatigue was discovered on each jet. I have also applied some white filler to some of the gaps. Filler added around the ovals where the F/A-18C has its ECM bumps aft of the cockpit. Those plates are not present on the Canadian Hornets. Finally, so that Alien Frog Modeller will not get angry with me for ignoring his inputs, I have chosen to fill in the gaps around the right hand side emergency egress panel. It was only present on the first few of our jets, and this one (around 770, I think, but I'll have to check) definitely would not have had it. After gap-filling, etc, I finally painted the whole thing in Tamiya light grey primer. That colour is an excellent match for the regular lower camouflage colour, FS 36375. Notice I've left off the missile rails, which were painted separately with the primer, along with various other bits like landing gear doors still on the sprues. Here's the bottom, nicely primed. Now for some planning and masking. Luckily, I'm retired, and have more time for this! ALF Quote Link to post Share on other sites
ALF18 Posted April 17, 2019 Author Share Posted April 17, 2019 For much of the masking, I use Nextape by 3M, which is quite flexible and easily manipulated into nice shapes. I stick it on a glass surface (dust-free), and slice several length-wise strips out of a single width. Now, time to outline the false canopy. Sure, most Canadian decal sets come with these, but I don't like using decals. This is representative of the latest style of false canopy, which is a bit flatter and more elongated looking than the original style. Small strips of 3M Nextape. Don't forget the little light grey gap! In fact, I learned (the hard way... don't ask!) that it is easy when working with an upside-down fuselage and detached doors, to get the light grey stripe in the wrong spot on the door... so I make sure I match up the locating pins when applying the tape to the door. I also have the door that goes on the drag brace with its little mask in this picture. At the same time as I paint the false canopy, I will paint the radome tan on the tip of the nose. Current jets have more and more weathering, and typically there is a dark ring around the rear of the tan portion. I used a pencil to make a dark circle on the primer, and it helped to locate the masking tape at the same time. Not sure if the circle will show under the Tamiya flesh paint I'm using, but easy to add the scribing again. Mostly masked. I plan to paint some Tamiya primer white in the main wheel wells, the FS 36118 on the false canopy, and the radome tan. Also some white into the intakes. It has warmed WAY up to plus 2 Celsius today! I can paint outside with the Tamiya primer. You can see some remnants of the snow in the background. I will not show too much of it; virtually all of our yard is still covered in at least 4 feet of snow, and some drifts are taller than 6 feet still. White primer in the intakes and rear wheel wells, and the dark grey on the false canopy. Radome is also done. Here I've put some pre-shading using the false canopy colour on the top of the fuselage. Not sure how this will turn out, but worth a shot. Here is the front wheel well. My plan is to mask over the dark grey when it's dry, and spray some white Tamiya primer into the well. Hopefully not too much cleanup required afterward. That's caught us up to today. More soon, but the TV beckons... Survivor, Whiskey Cavalier, Game of Thrones... WAY too busy these days! ALF Quote Link to post Share on other sites
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