The flying monkeys got me...

Helis, Fixed Wing, RC Sailing

AMA 957918

Pirate Kid Skeleton by RadDezigns.

Saturday, May 7, 2016

Warner Field, SNHRCC, Hudson, NH

Southern New Hampshire RC Club, flies from on top of an old landfill, at the end of Old Landfill Road, in Hudson, New Hampshire. Its a bit of a drive from my home, about 23 miles, while the Southern New Hampshire Flying Eagles field in Merrimack, NH is about 9 miles from home. But its mostly freeway, so it takes about 30 min.




It was a drizzly and occasionally rainy day today, but the winds were calm in Hudson, and when they came up it was a nice crosswind from the east, consistently. I drove out, expecting to be the only one out there, and I was. It was perfect for me to get used to the field's edges, and how the aircraft look as they make approaches from the different directions. This pic is from the inner gate, on the road that winds up to the top of the landfill, up there.



Drizzly. Looking over at the West runway, electric and gliders.



Looking North. I am parked in the area between the runways.



The Alpha on the field looking to the south, on the East side runway, gas/glow and electrics on this side. This side is more expansive and just seems to go on, and on. The grass needs cutting and the field is pretty clumpy. The grass took the paint off the prop of the 30cc sized MX-Bach.



Standing on the runway, looking east.




Mud day. This is after the first flight. By the time I was done it was dripping in thick mud.  All of them were.





The Twinstar. I flew her 3S, and not unexpectedly she flies lighter. 4S and she's heavy but flies well. I prefer the 3S, but need to get more than 2200 mAh, as that flies about 5-6 min. The 4S is a 3300 mAh and gave me more than 10 min. The front gear that bent so easily on the first Twinstar also bent easily in the clumpy grass at Warner.





The 30cc sized 10S electric MX-Bach. The Sbach wing has the same bad habit of stalling in slow turns on approaches and dropping the inboard wing suddenly and sharply, even with flaperons set up. I ordered some L angle Styrene to make vortex generators, and will make those and install them in the near future. It will be interesting to see if this bad habit is fixed, or I will just have to make those sharp turns at speed.  You can see the missing paint on the prop. Will need to repaint and re-balance.



I flew all of these! I left 2 4S batteries and one 3S battery unused in the box. One of the 3S batteries, a blue Turnigy one, decided to increase its internal resistance into the useless zone, but other than that, this is 2.5 hours of flying one after another.

I prefer this field. I like the openness and visibility. The runways need grass work (I wish I could find those fields you always see in the mags with the putting green grass smoothness...). The club knows this and is working on a plan. Long approaches from both ends, more so from the north, and I prefer flying on the east gasser side. Merrimack is nice, especially with the geo-tex runway, but the entire flight is flown above the tree line that creates the hole you fly out of. Nasty steep approaches from the south, and tight approaches from the north, in Merrimack. I do like being there though, so will likely keep memberships at both fields for now. I liked having the aircraft back in front of me again, like I enjoyed at MCRCC in Gulfport, MS, where I learned to fly.

It was an awesome, rainy day, all by myself.

RCGF 10cc Muffler Adaptation

In order to get the cowl on the pipe on the muffler had to be trimmed about 1-2 cm. This short stack sprays the airframe with oil... I don't think it affects performance much.

On the 30cc DLE I used rc car muffler couplers as extensions and they work awesome. I found a couple of options for the Spitfire and tried them out this morning.


This is the full car extension, comes with a short coupler and the extension. The bent pipe is soft silicone, but is about 6 mm or so ID. The muffler pipe  on the engine is 10mm ID. Thats a 40% loss in diameter, and Poiseulle adroitly predicts a significant increase in resistance to flow (1/r4). I expected some significant back pressure and figured on some rpm loss.



This lasted 3 min. The solder bead I had on the muffler melted off as I expected it might, and the engine threw the extension and coupler off. She immediately gained the almost 500-600 rpms she lost due to back pressure. So much for that one...




So I went with just the longer coupler, and she runs fine. It gives me that 1-2 cm back, but I suspect there will still be some oilage. RPM performance is maxed, around 8200 rpm at full.

I hope to maiden her out in Hudson next week. Need a good clear, calm day.



Thursday, May 5, 2016

Phoenix Models Spitfire with RCGF-USA 10cc V2 Engine Trials

The engine is installed and a couple of days ago I did the first start. I've been working to find its sweet spot as it breaks in, and I am coming pretty close. I then put the cowl on, and made a few minor adjustments. The weather had been damp and cold, so I expect to need some more tuning. I created a nice little hatch to allow access to the needles without having to remove the cowl.

Master Airscrew 13x8x3 prop.  I believe the spinner is 3 inches. I may replace it with a 3-1/2" if I can find one, notably a 3-blade. I just can't find one.



First start, since install. She was run months ago by Joe Nelson at RCGF-USA before he sent it out to me.



Full throttle. ~8400 rpms on these settings. She now tends to run around 7900-8200 full throttle.



Today, cowl on, done tuning. Idle around 2800 rpm, to full about 8100-8300 rpm.  Smooth transitions. On the DX8 I have a throttle curve set, no expo (it was screwing up the transition).



CG was curiously spot on.











Hatch to the needles. Wire handle secures against a wedge underneath the cowl.

I will wait for very good conditions to maiden her, and plan to do it at the SNHRC club in Hudson, rather than at SNHFE in Merrimack as I want wide open, though the nice runway in Merrimack beckons.

Tuesday, May 3, 2016

Spitfire Update: Pretty much done!

I've had to redo a few things, some a couple of times, but she's running and ready to maiden with a few adjustments.



Ready to start!





First run (Though Joe Nelson at RCGF-USA test started it before sending it to me). I had a lot of trouble finding the right settings for her. She runs great, but finding her tune spot was tough. To get a nice balance between high RPM and sufficiently slow RPM at idle took hours, of trial and error and I'm still not sure its right. Her high needle pretty much stays where it is, around one turn. The low needle which is tuned to get a clean advance from idle to high, changes everything including high RPM. It is the only needle I adjust, for the most part. That's odd. 

I used a Master Airscrew Scimitar 14x8 and a Master Airscrew 13x8x3, and with both get around 8100 RPM at full sometimes as much as 8400, idle around 280. The servo limits are at the stops for the throttle t about 115% high and 20% low. With the 14x8 I get about 6.8 lbs of thrust, and with the 3-blade, about 7.7. The plane weighs 7 lbs, so I am going with the 3-blade. She gives me over 20 minutes a tank at mid-throttle. I had to dial in a throttle curve to get a true 50% throttle, and a transition at low and high approximating 25% and 75%. All this spinning dishes... changing one thing changed another. I do think I have found her sweet spot. I suspect as she breaks in more, and when I get the cowl on she will need more tuning. I decided I need to create a hatch in the cowl to get to the needles. More on that later.



The left mount cracked during the break-in runs, so I had to replace it. I didn't want to re-grind one, since that's why it broke. So I decided to do it the way I should have, and cut out the triangle wedge that prevented me from putting it there. Later I noticed that the engine was pointing a bit left... so I replaced the right one, also grinding down the wedge, and now its straight and not MacGyvered.




The QuikFire was a tight fit, added weight, and I wasn't sure if the little engine could pull fuel through it making the tuning more difficult. It has taken a lot of time to tune her... She still idles a bit high. 




Cowl on!









I had to go through a couple versions of the choke arm.  Straight out works best. That's the cylinder on the plane's right side next to the cylinder. Works great!




Next will be seeing how things change with the cowl on, then maiden. I am thinking of doing the maiden at the SNHRCC field in Hudson, where there is more open space. 

In fact, I am hoping to head out there again soon. I rode my motorcycle out there the other day, and I like the field, first time I had been back in a year. I love the openness. Its a little further out, and it doesn't have the geo-tex runway, but the grass is short, even if it is a bit of a hill. Lots of room to fly, close in, and nice un-obstructed approaches.

Thursday, April 28, 2016

Spitfire is ready for engine testing!



Yes, the letters are black, not white. Decided I liked the black better. Also, different on either side. It's not meant to be historically accurare.

I decided also to try the 3 blade 13x8 prop, for break in and flight testing. I do have a 14x8 MA Scimitar if I don't like how she flies. As a gasser I think she is heavier than a glow or electric.

It will be a couple of days (work) before I get a chance to fire her up.



Wednesday, April 27, 2016

Oh! Oh! Oh! Its finally available!!



OMG! I have been waiting for this to become available for a couple of months now. JUST TAKE MY MONEY!!!

I want to pair this up with an RCGF 15cc gasser. This is going to have to wait, though, as it is going to be the most expensive project I have ever built or flown. It will have Hitec MG servos, and a Spektrum receiver.


Maybe for Christmas?

Tuesday, April 26, 2016

It was a good day.

One day off yesterday, had to fly AND ride the motorcycle, did both. I flew well and everybody came home as they left!



My Skyline MXS-R Breitling 30cc DLE. Love that sound!

I wanted to shake off the jitters, so I brought out the Alpha 450 and flew the crap out of her. I twisted her so hard her horizontal stab came loose. She still had a jiggy nosewheel (likes to peel off to the right) and I wasn't able to field adjust it fully, solved it when I got home by re-doing the entire rudder/nose wheel/rudder servo assembly. I think I have straightened her out. 

I also had an event on the ground that was odd. While she was on the bench all of the sudden her rudder went hard right and stuck there. Remember that this has happened in flight. The first time I flew in Merrimack I had a rudder issue and had to land despite it. Well when this happened I found nothing wrong, and the control horn didn't strip. I checked my DX8 transmitter and the subtrim on the rudder was all the way 150 right. That's not were I put it. Also all my DR/Expo went to 100/0!  This is a transmitter problem... I had sent my DX8 in after the first incident and it checked out. Spooky. The transmitter is only about 4 years old. I think I will index all the models on the SD, and reinstall the firmware. Curiously it only happens on this plane and I think one other (which one... was it the Pulse?).

Well, despite that I flew 6 packs and did landing after landing, yanked her around a few feet off the ground, take off, immediate 180, downwind landing, takeoff, 180, upwind landing, occasional crosswinds as the increasing winds shifted. I remembered I am a good pilot.

Then I took the 30cc up, less nervous, and flew several tanks, multiple landings and takeoffs, some simple aerobatics. I tried downwind approaches from the south over the Southern Ents, and could get her down but had to work it to drop hard without increasing airspeed or stalling, and with the tailwind ate up a lot of runway. From the north on the Runway 18 approach easy peasy, can easily get her in. I think I can reliably land this big one from the south if I have to, as there will be a nice headwind in that case.

Flew for a couple of hours, one flight after another, and enjoyed it! Left and worked briefly on the Alpha, then got on my Triumph Tiger 800 and spent a couple of hours taking the long way around.

All in all, I am a happy man.