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Walnut Scale Mr Mulligan

Rubber rocks Man !!

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Dad_flyer30/05/2020 23:28:05
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308 forum posts
315 photos

The sparrowhawk was the first model I made fly, two years ago. smiley.

Dwain Dibley.30/05/2020 23:39:20
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1505 forum posts
1487 photos

It's a small world......'scuse the pun .. LOL

Have you still got it D.F. ?

D.D.

Jonathan M31/05/2020 08:34:34
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730 forum posts
289 photos

Ours was 2016. The airframe and prop weighed 21.5g, rubber was a 20.5" loop (twice length of hook to peg) of 3/16" weighing 4.8g, needed 5.0g nose-weight, total 31.3g so a wing-loading of 0.70g/sq in - just right for calm outdoor conditions.

The max breaking winds of this rubber motor was calculated as 1700, so a safe repeatable 80% was 1360, but even on 1000 winds (60%) it was doing 45 secs!

Jon's Record Keeping Dept

PS Just checked the dust-covered surfaces - it has a 1/64" shim for right-thrust, a 30mm wide card down-tab two-thirds down the left wing and a similar left-tab on the rudder.  The Kid is now too 'cool' to play any more and is at his mum's, but the first calm day we get I'm off with it to my local field!

Edited By Jonathan M on 31/05/2020 08:42:52

Dwain Dibley.31/05/2020 14:47:04
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1505 forum posts
1487 photos
Posted by Jonathan M on 31/05/2020 08:34:34:

The Kid is now too 'cool' to play any more, but the first calm day we get I'm off with it to my local field!

I think the first chance he gets he's going down the park..............The Big Kid I mean.....cheeky

D.D.

Dwain Dibley.31/05/2020 14:58:47
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1505 forum posts
1487 photos

I made the Spats today, they are a bit of a faff, but look OK in the end, when the fairings are added.

I also stripped the top tissue and added two extra cross pieces to straighten the fuz sides, this was a success. I left the kink as you look from the side for the moment, I am sure I can get it out though.

Added the decals, and next is assembly. That is glue the wing and surfaces on. The little rudder hinges work a treat and are very stiff.

D.D.

I printed an instrument panel.

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Straighter !!

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Decals, Spats, fairings, and kink. LOL

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Dad_flyer31/05/2020 16:35:42
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308 forum posts
315 photos
Posted by Dwain Dibley. on 30/05/2020 23:39:20:

Have you still got it D.F. ?

Oh yes.

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Somewhat torn in places. The side access hole is where I had to extract the rubber after it came off the propeller during winding. I was less accomplished than Jonathan M, 10g of solder on the nose to balance. 31g total, without rubber. We only ever wound to 500ish turns but had a lot of fun. The first model I had to get out of a tree Nearly lost it and three small children following it over a cliff on holiday. Fortunately they stopped when I yelled, and the edge was 100yards further away than I feared so all was safe. That day, whichever direction I launched it in it would fly up, then shake itself and head off straight for the cliff.

Dwain Dibley.31/05/2020 16:50:57
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1505 forum posts
1487 photos

Brilliant Mate, it still looks Good for a load more sorties. Get out there and get stuck in D.F.

D.D.

Dad_flyer31/05/2020 16:55:03
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308 forum posts
315 photos

Too windy for that today, and all last week. Even late evenings the wind has been keeping up.

Dwain Dibley.31/05/2020 19:53:33
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1505 forum posts
1487 photos

Dead calm here, has been for days........

Mr Mulligan is assembled now, all except the front screen. The ultimate faff I think. I have it cut out but will take it tomorrow.

Just need to tie a knot in the rubber and were off.

D.D.

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Hang on who's flying....???

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Dad_flyer31/05/2020 20:19:54
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308 forum posts
315 photos

yes. Nice one.

Child_flyer says how big can you make a rubber powered plane?

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(Outer zone has one at 104"

McG 696931/05/2020 20:31:55
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3251 forum posts
1233 photos

... Double Diamond? ... isn't that strange, D.D ... ??? ...

Cheers& stay well

Chris

Dwain Dibley.31/05/2020 20:37:41
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1505 forum posts
1487 photos

The Old Double Diamond............

I would imagine there is no limit, unless like batteries, the bigger you go there comes a point where the weight of it overcomes the power it can provide.

D.D.

Dwain Dibley.31/05/2020 20:40:07
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1505 forum posts
1487 photos
Posted by McG 6969 on 31/05/2020 20:31:55:

... Double Diamond? ... isn't that strange, D.D ... ??? ...

Cheers& stay well

Chris

Yes Chris, D.F is the new custodian of the D.D. that once belonged to D.D. face 22

D.D.

Jonathan M31/05/2020 22:42:21
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730 forum posts
289 photos

Mr M looking very good!

john stones 131/05/2020 23:09:40
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11535 forum posts
1517 photos

Nostalgia. beer

Dwain Dibley.31/05/2020 23:35:46
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1505 forum posts
1487 photos

Thanks Jonathon, I fitted the motor and gave Him ? a run across the kitchen floor with positive results.

Gee Whiz John....that takes me back....Beer at home means Davenports and all that......Mind you the plane is as old as the advert.. LOL

I watched a video about "braiding " the motor, the rubber in this one is 2 X the length of prop to peg and when the winds fall off the prop drops down. do I need to braid, shorten, or just double up the rubber?

D.D.

George P.01/06/2020 08:22:45
68 forum posts
23 photos

Hi Dwain,

That's a great looking model and build. I like the registration letters.

I have also turned to Rubber to occupy the Lockdown hours!

I have just finished building a little Cessna which was great fun. I haven't done any tissue covering for a long time and thought I would go the Ezedope route. I will use it again because the lack of smell and water clean up makes it,,eh..'Eze'! However, I have learned from reading the comments of many skilled rubber flyers that it needs the correct method and as such is perhaps not so 'Eze' as Dope. It was a lot of pinning down and fingers crossed overnight until I could unpin, examine and sigh with relief.

I will follow with interest to see how you get on.

I am waiting for some calm weather so I can give it a test glide or two and then I will need to get into the strange and wonderful world of lube and winding!

George P.01/06/2020 08:26:25
68 forum posts
23 photos

Forgot picture...

cessna rubber power .jpg

Jonathan M01/06/2020 08:56:44
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730 forum posts
289 photos
Posted by Dwain Dibley. on 31/05/2020 23:35:46:

I watched a video about "braiding " the motor, the rubber in this one is 2 X the length of prop to peg and when the winds fall off the prop drops down. do I need to braid, shorten, or just double up the rubber?

If the prop falls off at the end, that's because the nose-block or button is too sloppy a fit - thicken things slightly with CA... but let dry properly before re-inserting!!

Braiding isn't essential but it is neat and shortens the length nicely. Shortening the rubber length will just shorten the duration. Doubling it will double the power (disasterously) and halve the duration (irrelevant after the aforementioned disaster).

The videos used to confuse me, here's the simple method for small models:

  1. before tying the knot, double a short piece of masking-tape over one end and press the winder's hook through it,
  2. tape the rubber half way down it's length to a table,
  3. wind clockwise (i.e. normally) about 100-120 winds (that's 10-12 times on your 1:10 winder) will do for Mr M,
  4. remove the masking-tape bits and tie the ends (Don's method),
  5. starting at the knot, work the braids smoothly with your fingers towards the other end, then back the other way.

I normally smooth the braids after I've rubbed a little bit of silicone lube into the rubber - makes it all slip nicely - doesn't have to be perfect, and tends to improve after winding properly in the model a few times.

Then pre-stretch the rubber - all in Don's book.

Jon

Edited By Jonathan M on 01/06/2020 08:58:50

Jonathan M01/06/2020 09:05:48
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730 forum posts
289 photos

Very neat job on the VMC Cessna George!

We used Eze-Dope on my son's Sparrowhawk... my brain might have been shot as a kid sniffing dope and diesel, but his is still fresh! It obviously works well enough if you thin it with water etc, but I prefer non-shrinking dope thinned to 25% and given 2 coats if indoor model, 3 if outdoors.

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