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Archive for November, 2012
Posted by SkyCadet | Nov 29, 2012 @ 12:39 AM | 3,558 Views
I finished installing the servos, into both the wings and tail. Ran a 12" extension on the servos in the tail, and will be using HK servo wire clips on the wings so that a Y harness can affix the wing servo connections.

Also paint-tinted the outer fuselage front and epoxied the RX tray onto the rear runner behind the battery tray.

I used CF rod/1" balsa blocks on the mains for reinforcement, pictures shown below... Now, just motor, setting the horn throws, and then connecting the electronics!

SkyCadet
Posted by SkyCadet | Nov 28, 2012 @ 09:48 AM | 3,658 Views
I finished up the enhancement for the gear in the fuselage (mains) and some slots in the fuselage to permit the wing servo wires to be attached.

I used 1/32" ply and used CA to affix between the runners just aft of the main wing mount. I then cut a 1/2" slot, just wide enough to permit the servo connectors to pass through. The ply will provide a guard against wire pulling out during assembly, and also some protection on the siding (which is Monokote). I also used a small bit of clear monokote over the slot to strengthen it from ripping or running, just in case

Oddly enough, no slots or anything was on the model! Not even in the manual! Must be a quirk...

My gear mains are reinforced using two 1/8" CF rods running between the two main runners holding the gear mount, affixed with epoxy. I also took care NOT to have epoxy make its way into the blind nuts, so that when my CF mains arrive, these can be put on in lieu of the stock kit gear. Two 1" x 3/4" balsa blocks were also placed between the small runner struts above the CF rods, epoxied as well. This will be much stronger than stock, and the balsa is mounted with the grain running vertical for strength.

I'll shoot some pix tonight, as I am wanting to also paint the inner firewall, and RX tray. I was sort of tired last night, and did not do too much on the plane other than those two little things.

Stay tuned! Motor, spinner, and CF gear due to arrive any day!

SkyCadet
Posted by SkyCadet | Nov 27, 2012 @ 01:23 AM | 3,585 Views
Just finished the wing hinges and aileron mounting...

This model is a bit bigger than I thought it was going to be, but that's just fine by me! It is a nearly-ideal size as a general park flier and field plane without being overly cumbersome. I like it!!!

However, I realized when putting the wings on, the manual does not have accomodations for the servo wires for the wings to go through the fuselage!

No big deal: just some 1/32" ply inner wall with slots, cut the covering to make a small slot for the servo wires, and we're golden! Also need ot mount my RX tray (kit also did not have one per se, but an easy fix as per my previous blog comments 2 posts ago).

I also want to reinforce th emains inner walls a bit with some balsa to give th eplane a bit more strength there anyway, so I will be doing this while still awaiting the motor, spinner and mains CF replacement...

Pix below... looking to be not too much more to do, other than the servos mounting and control horns.

SkyCadet
Posted by SkyCadet | Nov 25, 2012 @ 02:00 PM | 3,460 Views
Well, I decided whilst waiting for the motor and spinner to arrive, that I'd finish up the canopy detail and cowling stuff...

The cowling vanes were made with 1/8" x 1/4" aluminum streamline, and I used 16 of them radially positioned off a 2" dia. circular plate I made from 1/32" hardply. It was made 3/8 wide about the annulus, to accomodate the spinner's collet and allow positioning.

CF rod (5/64") was used for the mounting posts, using graphite epoxy on the backside of the plate. A template was used to get the angles and positions very close to ideal. After setting, I had a small photofilter 46mm set ring (the ring that holds filters in their cells) and placed this on the rear to sandwich the CF rod and provide a bit more strength. The vanes are 24mm long, and sit through the CF rods so they all position correctly, and that thin CA can be used to hold them.

After setting the CF rods, I hit the annulur plate with flat black spray paint, then mounted the vanes. The vanes are mounted such that they recede from the front cowl, just as a wing profile would. The vanes were a bit too dramatic on the plane so I darkened them after setting lightly spraying flat black in a "fog coat".

They look more like a CF vane or dark grey tint, which goes nicely with the color scheme of the cowl I think (see pics).

Once the motor arrives, I can then mount these on the front of the motor mount using graphite-epoxy. There is about 2mm or so clearance inside the cowl so the vanes JUST fit inside the ID of the cowl. It looks pretty sharp, and adds a real scale look to the plane with minimal effort and time (~1.5h total for cutting and gluing, and 15 min of painting), without overly compromising the airflow through the cowl.

I am finishing up my ailerons later tonight, and then mounting the servos and control rods. Once done that, It's just a few more minor things, and the gear mains CF struts to receive, and I'm flight ready!!! (2h maybe?)

SkyCadet
Posted by SkyCadet | Nov 20, 2012 @ 12:14 AM | 3,418 Views
My horizontal stabilizer is mounted on the fuselage (still drying, so pic later).

Elevator connecting wire is in as well. Test fitted system before mounting - excellent fit. The 2mm wire was redone as the stock one was a bit bent. I used white glue in lieu of CA or epoxy. My tail slides into the fuselage, and I had to ensure that it could be fitted and aligned properly. CA is pretty fast, and may not fill in enough to hold under more extreme landing or flight conditions. I did the same with my Pitts 12 15e, and it works fine.

During the fitting and clamping, the stabilizer main section was a bit off from alignement, slightly angled. I clamped the tail after applying a bit of opposite pressure to re-align the stab. Double-checked everything before final clamping. It's aligned with the wings (test fit and cheked for alignment with stab).

The canopy is a plain bubble type, so I added some black 3M vinyl cut 4mm wide to simulate the actual Yak 55 canopy. Pic shown below. The vinyl applied well, but the compound curve of the front of the canopy bubble is hard to get just so. But we got it pretty close!

Sdiebar: I was concerned about the kit gear struts. They are too narrow and not very high. I ordered a CF gear from HobbyKing, which should be PERFECT for this plane. HK280-148 is the stock number. Once it comes in, I'll fit it in lieu of the stock gear. Most Yak-55s I've seen online (scale planes) have a wider gear strut system than the kit has. This will look more proportional - should be awesome.


SkyCadet
Posted by SkyCadet | Nov 17, 2012 @ 12:38 AM | 3,239 Views
Just finished touching up the chipped cowl and the wing servo mounts.

I color-matched the 1/16" ply inserts to match the wings. I MAY after mounting, decide to cover with clear monocote the wood to smooth out the look. I have to wait until my servo extensions arrive in a separate shipment before I finish mounting the servos. Should be any day now...

The yellow is cadmium yellow - a perfect match to the yellow on the wings. The black is semi-gloss black.

Pix below...

SkyCadet
Posted by SkyCadet | Nov 16, 2012 @ 11:36 AM | 3,179 Views
I finally received my Yak55 kit.

NICE! Build quality is rather good for a kit in this price range ($62.99 @ HK). All parts are accounted for, only a minor nick in the front of the cowling, which is easily repairable with some graphite epoxy and some black touchup paint.

The digital servos I ordered are smaller than the slots for the wing and tail servos, so I'll have to improvise with some thin ply to mount them. Pix below.

Specs for the servos:

Model: HD-1810MG
Voltage: 4.5v~6v
Speed: .13sec
Torque: 3.9kg/cm
Bearings: 1BB
Gears: Metal
Weight: 15.8g
Size: 22.8x12x29.4mm

These have a LOT of torque, and have been hailed as some of the better digital servos in the micro/mini size ranges (10g to 20g). They run $12.50/ea. at HobbyKing. I am looking forward to trying these - they have ~50% higher torque rating than my 82MG Hitecs I put in my Pitts 12 15e earlier this year. Stay tuned!

I am looking forward to building this kit! It is very nicely covered, and everything fits well. The canopy is integrated into the battery cover - an excellent design for battery/electronics access.

More to come!

SkyCadet
Posted by SkyCadet | Nov 12, 2012 @ 07:16 PM | 2,928 Views
Well, I got some!!

Video... of the Super Dec BL on Skis with the ORXAS3 system on the plane.

Enjoy! Temp -2C, light variable SSE wind, 5-8km/h

SkyCadet

SuperDecBLSkisFULL1 (3 min 46 sec)

Posted by SkyCadet | Nov 11, 2012 @ 04:42 PM | 2,954 Views
Well, we got over a foot of snow recently, and so me and the trusty Super Dec on skis are scooting about...

Really having fun in winds with that ORX 3AS rate gyro system. Moderate gain just below the 2-o'clock position on roll and pitch seem to hold the plane nicely on approach.

BTW, for those interested, I started a topic (re-started actually) on the Yak55 build I'm doing... Anyone interested please feel free to jump in with pics, vids, build issues, and more:

http://www.rcgroups.com/forums/showthread.php?t=1767897

SkyCadet
Posted by SkyCadet | Nov 02, 2012 @ 06:22 PM | 3,519 Views
While I build my Yak55 from HK, I thought that I'd better get a decent motor for it.

Normally, a 2lb. plane on sport could be run by a RCT1120Kv motor, but I am wanting a bit more out of this plane. The RCT3536-6 (1250Kv, 500W) motor seems to be the ticket!

Pix of the motor below. The unit is ~$18 shipped. 102g, 500W max. I plan on running either a MAS 10x7x3 or 11x7x3 with this plane. Somewhere in the 390 to 420W WOT is what I am shooting for. Should be fun!!! My ESC will be a Turnigy 45A/55Ap unit from HK. We put a 30A on a buddies plane with the 1120 and a 9x7x3 MAS prop and WOW! It hauls. So, this should do very well also.

SkyCadet
Posted by SkyCadet | Nov 01, 2012 @ 07:25 PM | 3,205 Views
Well... PHOOEY!

Thanks to Sandy, our arctic highs got drawn over the priairies, mixed with pacific air, and dumped snow on us! At least 5"!

So, I donned the skis on my Decathlon, and went out for some winter flying fun. I was really hoping that we'd curtail major snow until November late, but it was not in the cards.

Two nice flights, absolutely glacier-smooth touchdowns! That ORX 3AS is really nice to fly with on skis! It held my plane nicely for a gliding touchdown...

Powder is so fun to fly on - but alas, the kiddies already are taking their toll making snow forts, snowmen, etc. I hope that I'll have some of the field left not looking like the lunar surface!


SkyCadet