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» Cox pop-gun...
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» Kit building 55 yrs. later
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» Flea market Cox P-40, F4U + receipts
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» Cox Sky Rally Kyosho Cox 049 -> It goes on
by MrGoodwreck Sun Feb 23, 2020 10:00 pm

Cox Engine of The Month
February-2020
Mark Boesen's

"Twin Needle Thermal Hopper"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


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Post  ian1954 on Tue Jan 21, 2020 2:30 pm

As mentioned in a previous post

https://www.coxengineforum.com/t13198-kk-radian

I got hold of two more Radian kits - one an original Keil Kraft and the other a Belair laser cut kit.

The KK Radian + (with electrickery) flies really smoothly and had so much pull on 35ft lines that my clubmates suggested increasing to 42ft lines. ALmost consistently wet and windy weather coinciding with available flying days have prevented me trying this but the Radian is definitely one of my favorite planes.

My original Radian flew on 7ft lines (yes 7ft) with a Cox Medallion/Hiscott combination. Even with the additional weight of battery, receiver and 4 servos - it flew and left the ground with aplomb.



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Back to the new builds - one will have a PAW engine and the other a Cox.

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I really like these wings they are light and very strong.
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Post  944_Jim on Tue Jan 21, 2020 6:34 pm

Is this the $70 kit advertised on eBay, or the one advertised on FaceBook from Canada?

I like it a lot,.and plan one building one once I thin down my "to be build."
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Post  ian1954 on Tue Jan 21, 2020 6:40 pm

944_Jim wrote:Is this the $70 kit advertised on eBay, or the one advertised on FaceBook from Canada?

I like it a lot,.and plan one building one once I thin down my "to be build."


Latest source

https://www.vintagemodelcompany.com/kk-radian.html

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Post  944_Jim on Tue Jan 21, 2020 7:18 pm

Thanks for the heads-up.

Good for Stan! This has to be a new addition to his line...I didn't see it at Christmas-time. His kits are supposed to be really nice.
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Post  dirk gently on Wed Jan 22, 2020 3:59 am

ian1954 wrote:As mentioned in a previous post

Back to the new builds - one will have a PAW engine and the other a Cox.

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It looks like it even has four paws!
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Post  getback on Wed Jan 22, 2020 9:22 am

I agree those are some strong looking wings , good job Ian . Popcorn
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Post  ian1954 on Wed Jan 22, 2020 10:45 am

dirk gently wrote:
ian1954 wrote:As mentioned in a previous post

Back to the new builds - one will have a PAW engine and the other a Cox.

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It looks like it even has four paws!

I had rested the wings against the cushion and then went to find the camera. When I returned, my little prodigious gas passer had decided to rearrange them.
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Post  ian1954 on Wed Jan 22, 2020 11:00 am

Now for the tanks.

The original plan just says 1/2A stunt tank. The plan for the "Kittywasp" has exactly the same tank and says Mercury economy wedge 7cc. These tanks are sold still as Mercury small but cost £10 each (plus postage).  I remembered seeing one in another of my kits and so dragged it out. £10 seems alot for such a small tank.

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So out came the tin plate and four strips - 2 x 1" and 2x 5/8" taken from it.

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£1.99 for the sheet of tinplate and enough metal to make 5 tanks.

A bit of folding and trimming

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Into the vice for soldering

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All tested for leaks and ready for installation

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Post  Marleysky on Wed Jan 22, 2020 11:17 am

Ian, Nice job on making your own tank. I really like that design, adjustments can be made to fit the airframe while maximizing fuel capacity and flight time! RC Plane
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Post  ian1954 on Tue Jan 28, 2020 12:06 pm

Fuselages underway

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Post  akjgardner on Tue Jan 28, 2020 2:42 pm

I Really Really Really like this Airplane... Very Nice Job on the build
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Post  ian1954 on Fri Feb 07, 2020 6:35 am

I covered the wings with some of that heat shrinky stuff. Don't ask me which one, it is not monokote, but from odds and ends that I acquired years ago with no labels but very, very cheap.

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Now back to the fussylages. These are fiddly models to build and it would probably be easier to completed the build and then cover it, The problem I have is that I err on the clumsy side and sanding and finishing a complete model is almost certainly going to end up with dings and breakages.


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Post  balogh on Fri Feb 07, 2020 7:27 am

Beautiful workmanship, congratulations Ian
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Post  Kim on Fri Feb 07, 2020 9:29 am

Seriously Nice Build There !!!!! cheers cheers cheers cheers
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Post  getback on Fri Feb 07, 2020 10:17 am

Tanks look great Ian and the planes are coming along very good , i like the colors RC Plane
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Post  944_Jim on Fri Feb 07, 2020 3:46 pm

Sweet hinge work! I can't wait to watch the videos.

I need to economize my construction. Two of one kit seems to be the most effect for the clocktime!
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Post  ian1954 on Sat Feb 08, 2020 10:40 am

Now some of you may be wondering why I refer to the fuselage as the "fussylage". This is the the third(and fourth time) I have built this model and this is the section of assembly that I do not look forward to.

There are several problems to overcome here and I only hope my description of them makes some sense.

The first is - cover the wing before fitting or not? It would probably be easier not to and would make gluing the wing in place a much simple task removing the need to remove covering to get a good glue joint.

When you look at the pictures below, you will see that the pushrods create a problem! Now a warning here - the pushrods are 14 swg - use anything thcker and you will not be able to apply a temporary bend to wiggle the pushrod through the fussylage to the elevator.

Why do you have to bend it? Because the undercarriage is in the way and this is stitched and glued to one of the formers.

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The pushrod also has to exit at the rear side of the fussylage and needs to be encouraged by further bending to pass through all the formers and exit at the slot.

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It is not all over yet. The wing has to be continually eased in and out for a neat fit and to get a close joint with the fussylage followed by trimming away the covering.

Now back to covering or not. Covering the wing first makes it easier to avoid the wing snagging on ribs etc. while all this manipulation is going on.

I often thing that it would be easier to build the fussylage around the wing but keeping it straight would be difficult. Also to leave off the upper decking before the wing is fitted bit there is no strength in the fussylage until that has been applied. I also prefer to get all the rough shaping and sanding done while I can still hold the fussylage and avoid clouting the wing.

Glueing the wing to the fussylage is also a tad fraut at this stage. The pushrod is through the slot at the rear end and is forcing the wing out of line. It needs to be bent at the end through the slot to get a straight run through the fuselage in exactly the right position for full forward and aft movement. Not easy if the wing is not firmly attached! This required the use of rubber bands to hold the wing and get the alignment and then careful use of some fine nosed pliers,

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The wing could then be glued in place.

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This took me about 6 hours but I am finding (as an answer to Jim) that the second model is done far quicker as I am more prepared. About half the time.

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Post  Cribbs74 on Sat Feb 08, 2020 4:51 pm

Excellent work! I really like your custom tanks.
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Post  ian1954 on Tue Feb 11, 2020 3:43 pm

In other members postings, I have often referred to the difficulty I have with canopies. I look at the neat lines on Mauricos models canopy fitment with great regard.

I have ruined numerous canopies - split them, over trimmed them, messed up gluing them in and trod on a few.

I have devised a way of making it a little easier (not perfect but easier) and provide a backup fitment in the event of me ruining one.

in this instance, two Radian kits from different manufacturers - the canopies are a different shape although the fitment area remains the same.

So I cut 1/4" balsa sheet into slabs to follow the canopy profile in fit into to opening.

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Then sand it to shape.

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This way if I mess up the canopy I can paint this and stick it in. I suppose I could also use it as a plug to shape a new one but my attempts at this have not been too sucessful.

Using the shape lets me trim the canopy.

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This works fine for everything except where the canopy overlaps the "bonnet" but it helps.

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Post  getback on Wed Feb 12, 2020 7:44 am

Thats a great idea Ian , i have seen a tool that works kind of the same way , but can't find it right now . Did you glue them blocks together after fitting? Huh...
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Post  ian1954 on Wed Feb 12, 2020 9:18 am

getback wrote:Thats a great idea Ian , i have seen a tool that works kind of the same way , but can't find it right now . Did you glue them blocks together after fitting? Huh...

They were glued together before fitting and then tack glued in place for sanding. 80 grit followed by 150 and then 240.

Then cut out with a razor blade at the tack joints.
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Post  Mike1484 on Wed Feb 12, 2020 11:31 am

Looking good Ian . I like the P.A.W. diesel model . I have several P.A.W.'s and I like them all . Keep up the good work .Nice tanks !

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Post  ian1954 on Mon Feb 17, 2020 10:27 am

Almost ready to fly. Still mulling over decorations and trim but finished.

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The blue one with the PAW engine weighs 80z (228g)
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The red one with the Cox thingy weighs 7 3/4oz (220g)
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Post  dirk gently on Mon Feb 17, 2020 11:14 am

Perfect, loving them both!
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