Mr Cox

I've been working on a "Yellow Jacket" from Morris Hobbies this winter and just I would share a few images. The kit has a few die cut parts and a bunch of balsa, so burnt stuff here. There are a few minor design problems and small arrors in the drawing, but otherwise it is a fairly straight forward build. It is a pity they didn't come out with a revised version, and now I understand that they are no longer made. No problem building straight from the drawing though.

Here is the wing build, I only change the front wing attachement a little, the front ply mount was a little too short to me. I also put an additional balsa support for the the two pins that will hold the wing.



The supplied torque rods for the aileron are an overkill. I used them but skipped the brass tube and instead they run in wood and epoxy.



The completed wing with servo weights about 3 oz, so that's quite alright to me.



I'm planning on using a Cox .05RC, it is a little heavy but I can always change to a Norvel later. I'm trying to keep the weight down and use aluminium nuts for the engine mount etc. In order to balance correctly it lokks like the battery will end up near the trailing edge of the wing so I'll put a little hatch there in case is has to end even behinf the wing.




I will also skip the rudder in order to reduce the weight. The stock vertical stab looked a little big to me (especially when I will not have a rudder) so I've reduce the size of that a little.

Mr Cox

I'm currently at the hardest stage to me, I don't mind doing the covering it self but the choosing the design and colours is a pain. I'm using the oralite yellow and there is hardly any colour in that. I've therefore added some bits of regular oracover.

controlliner

Beautiful covering job, you should be proud

vicman

My Feedback: (10)

Very nice!

Mr Cox

Thanks for the feedback. I'm covering the vertical stab in a similar fashion, and then I just have to try and copy this onto the other side too.

combatpigg

My Feedback: (3)

It looks really nice Mr.C !

I didn't think Morris Hobbies was still in business?

The wing looks well engineered, thin but strong.

That engine should be a real conversation piece with glow engine lovers.

Max_Power

Covering looks pretty dang sweet!! I for one will admit to being "Covering impaired" be glad when they come up with a "Dip". I can add stickers from there! Todd

Duane-RCU

My Feedback: (5)

Awesome job! I have two kits, and just look at them occasionally, someday maybe...

Tee Bee

Very nice work, Mr. Cox. Looks like a fun plane to fly as well.

R/C Phile

Nice Job Mr. Cox. I really like the covering: Interesting color choices and drum tight.

I always liked Morris Hobbies' original and no-nonsense approach and often thought about buying one of their kits.. I thought they were out of business? (Their web site is currently down) Is that a jar of Balsaloc I see in the background of the last picture? I thought that stuff was for LiteSpan covering only.

Mr Cox

Yes, Morris Hobbies are unfortunately out of business, and I found this kit on the bay. I like the thin wing profile and the light construction and hope it flies well too. The full kit is not really needed, everything can easily be made directly from the drawing.

The jar in the background is a varnish (similar but thinner than balsa lock) that I sometimes use to wet a cloth and wipe of dust from the balsa before putting on the covering. Just makes for a little better/safer attachment in critical places. I only now realize what a mess I have on the build table...

Mr Cox

I've found a good review here: [link=http://www.rcmplans.com/issues/1999/sep1999/content/reviews/r-rv-yellowj-091999-1.html]RCM 1999[/link]

They seem to have the correct data (the length listed on the box is wrong):
Length: 21"
Wingspan: 27"
Wing cord: 6-1/8"
Wing area: 165 sq. inch
Weight: 14 oz (From Morris; 14-16oz)

I've been a little worried about the weight on mine since the TD 05RC weights about 1 oz more than a regular TD. But it looks like mine will end up well below 14oz actually, so that looks promising. My scale just died on me though, I hope it is just the battery that has gone dead.

Mr Cox

I've been playing a little with the layout on the inside and the positions below brings the CG right on the wing spar, there is actually quite a lot of room in the fuselage.

Andrew

Beautiful job, Mr. C . The transparent yellow really looks good showing off the wing structure and fuselage grain.

Mr Cox

Thanks for the nice comments. I've now hooked up the elevator and I'm going to test dyneema line on this one. It is very light, doesn't stretch and there is no metal to interfere with the antenna signal. It looks like I've might have been overcautious with the weight, it seems to end up below 11oz. [X(]

hllywdb

Very nice work Mr Cox! Nice colors too. 11oz is sweet, should fly great on the cox. If not the Norvel will pull 11oz vertical at 1/2 throttle!

nitroairplane

that is a real nice plane love the colour sceme you should convert it to diesel for more power

Mr Cox

The power is actually very similar between glow and diesel, while the diesel can pull a larger prop (at lower revs) without overheating.
I have several PAW engines that I can use instead but somehow the sleek wing calls out for a high revving glow engine, to me, so I'm more inclined to put a Norvel in the front if the cox proves too timid.

nitroairplane

i saw your diesel pee wee .020 on youtube do you have that in a plane at the moment?

Mr Cox

Yes, it is in a J3 cub. I have flown it with the peewee on glow before but had problems finishing the tank, it now runs more consistent on diesel.

nitroairplane

nice plane i love cubs,is that a free flight and is it powered by the same one you have on youtube with a davis diesel head

happy flying

juanjulian

My Feedback: (9)

Very nice and clean build.

You should try electric on this.

Cheers

Juan

Mr Cox

The cub is three channels, rudder, elevator and a home made exhaust throttle (when it was glow). On diesel I need to prime on the exhaust side and I haven't played with the throttle setup yet.

I don't have any electric engines, I have seen them around for about 25 years now but I could never understand why anyone would remove the fun part...

coriolan

So true[:@]

Mr Cox

Maiden flight today and used a 6x3 rubber ducky prop. Should have warmed up on something else first I guess, we have had a long winter here. It was pulling to the right and down a little, it is very sensitive on the sticks and I was struggling to keep it within sight range until I could neutralize the controls.

Flies really nice though and only needs about half throttle to zip around, and the vertical feels unlimited. Deadstick landings are really soft as it barely weight anything. I will try a 5x4 prop too, as soon as my thumbs stop shaking.

Still in one piece and not much oil on it either: