Hike has flown for the first time – and did it well. At first I was planning to throw it without motor and after first flight would by succesful try powered flight. However, after launch it was gliding far beyond airfield and I didn’t want to get burried in mud, so I decided to switch motor on and start first flight for real First flight has shown us it flights really, really well. I’m very pleased with stall characteristic (really predictible, it only lowers nose and starts to gather speed), it circles really tight and has great glide ratio (however […]
We would like to present the HIKE prototype ! You must believe us that the pics do not reflect the size of this beast. As soon as the bayonets are done we will make pics with some nice reference layout. Prototype positively passed static tests (the wings fixed to the bayonet sockets, load the bucket and pouring a water), so he got a green light to put parts together and do pics 🙂 There are still a few trifles – mainly V’s, bayonet and tail mount. We have to equip it now and … throw it 🙂 And besides, already […]
We made a fuselage: Nothing complicated. The fuselage is made of glass and blown with the inner tube. Of course, it comes out of the mold with ready-made threads to fix the wing 🙂 And we also made a tail. The tail is a more interesting design because the bald part itself was made by crushing XPS: And the beam was blown, just like the DLG fuselage: The effect is really nice: Lightweight, rigid and is made in one shoot. Next in line are the wings, but we are waiting for metal inserts to make bayonet sockets.
We start milling the tails, the patterns are presented as follows: As you can see – the tail stabiliser with tail boom is supposed to be a whole. The design and construction is hybrid. Ie. The bald part will be laminated as a full core element and the tail boom will be blowing. The solution has advantages and one major disadvantage – the form on it is just big. Maybe not cubby, but the linear dimensions are already huge. The effect is that the whole does not fit on the milling machine, hence the patterns will be divided into milling […]
In this topic we will present final finishes for previously prepared forms. For starters – how do we do the studs fixing the wing. The whole problem is that the milling machine has three axes, and somehow lead a hole parallel to the surface of the mold separation. The solution is somewhat indirect. Well, on the surface of the separation of the mold we make such a channel: Then, we put a brass tube: And at the end of the day we flood it with gelcoat: Well, it could be any resin, even Poxipol would be ok. The gelcoat just […]
Time to boast : That’s how it looks at all. As you can see the whole is polished in the working part. Excess glass from the bottom of the mold is cut. It is not a big challenge, but labor-intensive, to set it up as looks on the photo. The goal is to get a really good polishing paste. Of course we start from cleaning the surface of wax molds – the fastest can be made with nitro solvent. Later, it goes to the wet sandpaper, gradations of successively 800, 1500 and 2500. If the whole sandpaper is cleaned together, […]
We continue the theme of filling up molds. When applied gelcoat to forms, we can take care of the first layer of reinforcement: As you can see, the first layer of reinforcement is a glass mat designed to work with epoxy. It is applied first, for two reasons. The first is the no texture could come out on the surface of the mold, and the other is there are a lot of holes. This makes it very easy to bleach the first layer and there is no risk that there will be an air bubble that swells while the composite […]
The work of fiiling up molds is quite long, so the entry is divided into two parts. All work should always start with a pattern review (if nothing happens to them and they are clean etc.), then check to see if we have a complete set of materials and whether all the tools are prepared. The reason for this meticulousness is quite simple – if the gelcoat touches the pattern, there is no retreat ! The first step is to wipe the patterns gently with a damp cloth. No photos, its nothing complicated! Then on all the edges of the […]
Since the molds have already been made, it’s time for a small summary of the materials that were used to create them: -4 Terra 700 model plates; -100 h working milling machine; -4.5 kg Axson GC180 gelcoat; -10 kg of glass fabric, various weights; -35 kg resin Lh160; -10.5 kg hardener H146; -125 kg of construction sand; -0.5 kg of Axson Cire wax paste; – Aerosil – half bucket. Now you can expect a relationship as soon as Hike is born.
Another manual work resulted in the patterns made for appropriate forms of the model. It can be seen that from the waxing came the pins in the holes. The pins are made of ordinary aluminum tubes – soft and tacky, but so fast we had nothing else. The brass tubes are pasted into the holes, they are to be made of bushes for the target, steel pins. Exception is to guide the wing fixing bolts. Here is inserted a tube with a hole diameter (because we had tubes of matching diameter), which is waxed. Another tube that is 1 mm […]
Milling machine has done a job. Now it’s time to finish the target area. It’s a job for hands only and some patience and precision. At the beginning sandpaper 500 and gradually to 1000 wet. Then finishing putty where necessary. And waxing at the end. We use the Axson wax for pattern plates. After waxing we should wait few days to be sure that it evaporate the solvent. The result: Technically, it looks a little different than with other wax. Instead of imposing a thin layer, wait until it dries, then polishing, it should be rubbed on the plate, layer […]
For the first, we started with the order model plates. Initially, we planned to order the classics, that is Prolab 65, but we choose 700 Terra at least, offered by Milar from Grodzisk Mazowiecki. Same panels are advertised as equivalent Prolab 65, they have similar cutting parameters, like density and to have similar mechanical properties. The moment when the model plates arrived, it is usually the moment when there is no way back, because what we can do with this heavy crap ? So there was nothing else than throw it to the router and start milling. After several hours […]
Is airframe designed to fly FPV must be made of foam or construction must be the classic plane with the motordrive? We also wondering about it and the answer was very simple – NO ! The development of aviation has always followed through experiments, crossing successive borders, trials and errors and conclusions. According to the above, we decided to design the airframe for flights FPV according to the following assumptions: Strong 3m wingspan Motorglider (because starts from the lobby, it’s quite exotic) Easy landing at point The propeller may not obstruct the lens (pushing motordrive) Flaps to extend the speed […]