3D print, DLGComments Off on How the Blaster-1 became a E-Blaster
As I mentioned the other day, I decided to turn the Blaster into something Electric. Mostly because I don’t know what else to do with it..
All up weight is now 435 Grams, so that is 81 grams more then without the E. Don’t know how I got the 19 grams earlier. Still happy with it.
The spinner seems to have a slight imbalance, but with a 2S lipo and low rpm it stays together for now. Something to look into later. First we needs some test flights. I also need to think about keeping the prop tight to the fuse. The usual rubber band trick will probably be employed once it flies.
So what’s the plan for launches? Not sure yet, toss it like a normal DLG and hit the motor switch once you release? Need to remember this one has a history, so full power launches will be a bit scary. Anyway, we’ll see.
It actually looks quite nice. Sadly the stab and rudder have some damage caused by a once in a lifetime mini tornado that lifted it and tossed into the fence.
Of course I did the smoke test today. Mounted the motor, connected a 3S battery and hit the throttle.
I ran the Emax 2204 motor for 10 secs before I could fry an egg on it. Hmmm, maybe I should have looked beyond ”it fits”?
An 8*4 prop is not quite the same as a 5*4 drone bit of plastic. No problem, what else do we have in the BigBox of Stuff? Ah, look at that, sort of ancient history here. A HET-RC Typhoon Micro 6/3D. More or less the first motor I got just before the foamy craze started.
Weight : 35 grams
KV : 1460
Max Current : 12 A
Power Nominal : 90 Watts
Recommended Props: APC E 9 X 4.7
The 9*4.7 is what is relevant here. Ok, lets see what E-Calc says:
50 Watt on a 2S Lipo with almost 4.8 m/s vertical performance at 370 gr RTF, and a 5 mins motor run on a 450 mAh battery. Ok, no problem. Lets go!
Getting a bit nostalgic there while looking for the plane with that Typhoon. At the top is my Blaster in good ol’ N-Ireland. It had a variety of radio gear in it, this is I think the Spektrum-Mpx version.
Can’t resist looking back: Yellow Road. With the right northerly you could hang for an hour in the breeze, untill your fingers turned blue. Further back was a similar bowl facing south-ish. That was the better spot. My first flight with the Birdy lasted 30 mins or so.
And I found it! First ever CNC-ed plane. Not a real serious design, just made it, because I could. This was powered by that HET-RC Typhoon. Did fly well enough in the backyard!
While waiting for some parts, I decided to have a go at another project that’s been waiting to be started. I still have my original Blaster 1, RTF is approx 350 gram, and while it was fun flying it from a slope, it always a struggle to throw it higher then 35 meters on a good day. In the meantime I have something black that weighs 220 gram, and does go a lot higher!
That says much about my technique! Anyways, I’m electrifying it. There’s some quad engines lying around, some small Lipo cells that appear to be good enough for a few more flights. All that’s left to do is some radical surgery.
The first cut is the hardest, after that it’s a matter of making enough room for some servo’s and Rx, and somehow getting the CG sort at the right location. As always, I’m using the TLAR technique to get the dimensions right. There’s still a bunch of D47’s from Indoor days gone by, I’m sure I can find a receiver that will do the job, so I’m almost finished, just a matter of assembling a few parts.
I could not find the right size aluminum in my stash, which is a good excuse for doing a quick printed version of a prophub. I have a few 8*4 foldable prop blades, not really fit for this purpose, but I’m not using them for anything else. The first straight center part looks good enough, but then I wanted to have the blades tighter to the fuse. Some headscratchings later I have a fully printed foldable propeller including spinner part. Printing is is just rough and quick proof of concept, not the final one yet.
In the meantime I started preparing the fuse. Those were the days that Vladimir used kevlar for the front end. Real fun when sanding!
Will a printed part be strong enough to hold on to those blades? The answer to the question will have to wait till I assemble the battery. If not, I can always fall back on a proper 5 euro part.
That looks about right! so far 19 grams more then when I started, I need to add some glass around the front end a something to hold the servo’s. Also a small lid to stop stuff escaping. CG used to be at 78.7 mm, 3 mm to go!
During our holidays in the home country I was entrusted with a handful of carbon, with the request to ‘just build it and enjoy’. Over the last few weeks that building process was finished. Even though the total amount of hours spend are not that many, it all adds up. Today I finally got a new receiver, so after the new batteries arrive, we should be all set to go. All up weight is 220 grams, which probably is a bit on the light side, if I compare it with the Tweagle. I ended up adding some extra weight to that one too. At 245 gram it has better penetration, and it fits my style better. For this one I decided to make the wing detachable with a home made connector. The pins originated from a scrap cable assembly. (Good thing about working with medical equipment is, that there’s lots of good stuff that we throw away.) Of course I have read stories about bad connections. This one will not have bad connections!
DLGComments Off on Out with the old, in with the new..
‘t Is the time of year to indulge in a nice wee present for oneself. Given that I need more exercise, I decided to treat myself to a fresh new DLG. The present Blaster is still flying well, but the new breed of DLG´s is just that, totally different animals. Rather then go for something ”foreign”, I decided to call Alex Hoekstra from Tweagle fame, to see if could make me a Xmas present. Lucky for me, the answer was yes. So a quick trip was organised ”up north” and soon afterwards I was able to take posession of a shiny black DLG. First thing you notice is: It weighs nothing! At home I quickly located my scales to find how much nothing is. Wing is 104 grams. (This is the D-box version), El/Ru together 10 gr. Fuse is 38 gr. All added up, we are talking 152 grams for bare carbon! At the moment, the fully assembled glider RTF sits at 230 gr on the scales.
I have 4 KST-08’s fitted, a Jeti 5 channel RX, a small 2 cell Lipo from ”way long ago”, and my Openaltimeter found a place too.
I updated my Multiplex Cockpit to Jeti, but even though the setup works flawlessly, I might start saving for a true Jeti. Setting up the Cockpit is just so tedious compared to the a proper Jeti system.
Once I do some fine tuning I will probable loose a few more grams. (Wiring is bulky at present, I can also loose the connectors on the receiver, might still change the guitarstrings to a bit of kevlar, we´ll see.
Building a plane like this is not to be undertaken if you have never built something high tech like this. Do take you time planning your build. Everything is just strong enough to do the job, it is not designed to be bashed about in your typical overfilled hobby hideout! Look on RCG for tips. (or RC-Networks).
One thing to note, is that the weight mentioned on the website, is probably ReadyToFly, not bare carbon!
I do not have a lot of build pics, it turns out that fotographing carbon is difficult. Tomorrow we have a midwinter-spring, temps are predicted to hit at least 14C, good enough for a spin I would say. This will be the second outing, the first spins I made 2 days ago in 8 m/s wind, not really that good for a maiden flight. All I can say it went up like the proverbial homesick angel! The third toss showed a respectable 30 meters on the Altimeter, and this was just a gently flip of the wrist!
Due the the fact all noise has been banned from our field, (except of course from the geese, motorcycles, tractors, mopeds, powerboats etc..) one has to adapt to the situation. Therefore no moaning, just use whatever you can. I´m having lots of fun with my Orion/Insider. After the mishap a while ago, things seem to have settled. I´m using a 14*10 prop now, and get up there ´real fast´. Could do verticals, but it is sometimes hard to see what goes on, so simply going up at an 80 degree angle is good enough. Last time I looked at the logs, I think they show that power is switched off at 100 meters (says the Vario) but it keeps on ascending to 140 meters. Once it goes, it goes! (For my own record, CG is at 97 at the moment.)
Last weekend the poor Blaster suffered a mishap from a pretty violent wind-gust, that lifted both my small Extra and the Blaster in the air and smacked them right into the fence. Not a happy day for the Blaster. There´s some damage on the tailfeathers, so far I´ve fixed things with some tape and it flies again. I´m contemplating if I should repair, trade up or order new parts.
I revived the Epsilon. Never got the hang of it last year, mostly due to lousy batteries. Today´s efforts were positive, we go up at a reasonable speed, but it is not an Insider! I also need to find more ballast or a bigger battery, but things are manageable. I find the flaps extremely effective. You can only deploy them for a few seconds, the plane really stops dead in the air. Fun to watch, but maybe that explains why the manual says to deploy them only. There is a long thread on Rc-Network-de, basically it boils down to:
It´s heavier then it´s predecessor. The weight mentioned in the sales-blurb is grossly wrong. I figured that out! Think 3.5 kg.
People quickly convert to a 4 cell setup.
Flaps need modifying to be able to follow the ailerons.
Braking is really effective.
Wings are a pain to mount.
Mounting stabilizer is questionable
Soldering of the elevator wire!
Use decent servo´s
Pic below was taken on a Saturday, but due to the restrictions I can not tell you when it was taken.