Douglas Boston IIIA

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Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » October 4th, 2012, 11:49 am

I sure hope so!

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » May 10th, 2013, 12:17 am

Slowly but surely.....

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Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » May 10th, 2013, 12:21 am

Steel wing retaining straps have now been permanently glued and screwed down...

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Nacelles are almost finished....i'm just moulding the cowls and have then to mount them and the wings are ready for glassing...

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chris willis
Posts: 519
Joined: July 2nd, 2009, 12:44 pm

Re: Douglas Boston IIIA

Postby chris willis » May 10th, 2013, 7:08 am

Looking very nice, am enjoying the build

Ken Bones
Posts: 221
Joined: August 1st, 2012, 3:26 pm

Re: Douglas Boston IIIA

Postby Ken Bones » May 10th, 2013, 7:36 am

Ahh, twins R us for next season ;)

Bonzey

Alan Cantwell 1131
Posts: 1696
Joined: June 15th, 2009, 8:21 pm

Re: Douglas Boston IIIA

Postby Alan Cantwell 1131 » May 10th, 2013, 1:30 pm

Steve, i just LOVE the way you and your father think outside the box, you two do it differant, great stuff!!

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » May 13th, 2013, 9:42 am

Thanks Alan, Ken, Chris....After having had quite a disaster with the fiberglass molding I need all the support I I can get!

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » February 12th, 2014, 6:57 pm

At last a bit more progress.....

Glassing is about complete, just one more coat on the Fuselage. One wing panel and the flaps have now had a coat of 2 part high build primer (I brushed it on as there is no chance of doing any spraying for a while!)

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chris willis
Posts: 519
Joined: July 2nd, 2009, 12:44 pm

Re: Douglas Boston IIIA

Postby chris willis » February 12th, 2014, 7:10 pm

Nice to see you back on it, a lovely example Steve

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » February 20th, 2014, 10:07 pm

Thanks Chris!

Managed a little bit of work today.

Servo install in the wings has begun, plus I've finished the linkages for the geardoors and throttles.....

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Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » February 20th, 2014, 10:11 pm

The tanks that I bought for this project (about 5 years ago!) didn't have bungs with them....after searching high and low on the internet I've given up and decided to make my own tanks. I can make them shade bigger and also to suit some Dubro Bungs which I have hundreds of!

Using the 'Lost Foam' method......

Blue foam blanks cut to shape and them wrapped in Parcel tape. A short length of brass tube thats the same diameter as the rubber bungs and a couple of coats of wax.....

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Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » July 15th, 2014, 12:42 pm

I am happy to report that the Boston has had its first 3 flights.....not the tidiest of flights but it's back in one piece!

The two Laser 360s had previously been a Ziroli P-38 Lightning (well two actually but thats a long story!!). the last Lightning met its end after elevator flutter stripped the gears on the servos. Though the 360's were not badly damaged in the ensuing crash, they did end up needing new needle valves and bearings. Unfortunately this means I'm back to square one with the needle settings! After a fair while annoying the neighbours at home, I thought I had the settings about right. Initial runs down at the field sounded good and the engines seemed well matched. Taxi tests showed reasonable tracking, though the model always wanted to pull to the right with low power settings. I put this down to the nose wheel not being set up quite right..................

So, the first take off was initiated, with a seemingly stronger pull to the right (should have taken note here!!) and just at the point of liftoff, the right engine coughed, spluttered...but thankfully picked back up again. Had it not, then the outcome would have been very different. You'll see on the video that the resulting swing and roll was just about at the extremes of what could be controlled....I certainly feel lucky to have got away with it! A hasty circuit was flown and a firm landing got the Boston back where she seemed to want to be!

https://m.youtube.com/watch?v=aSZSaesJIKU

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » July 15th, 2014, 12:44 pm

After a bit a of a break to let me nerves settle down, we ran the engines again. The right hand engine was also found to be VERY lean at the top end. Not quite sure how it ended up so far out, but still seemed to run fine. I can only put it down to the fact that Laser Engines are so benign and forgiving that the good nature of the engine was masking my bad setting of the needles! Luckily, it was easy fix and we went for flight 2!

Still pulling to the right on the ground despite a tweek of the nose wheel steering...The landing was interesting as I found I needed over half left rudder to keep the nose pointing in the right direction as she touched. Though a little untidy I was so relieved that the model was back home again!!

https://m.youtube.com/watch?v=x5wgOMkAf4A

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » July 15th, 2014, 12:45 pm

Back to needle tweaking then! Though the top ends were far, far better, the idles seemed farther away than ever (which is often the case when you start messing with the needles, the top end always affects the bottom end and vice versa!) Almost a full tank of fuel was put through each engine while setting up the needles again, but this time things seemed much better. Throughout the rpm range the difference in revs was no more than 150rpm. Top end was around 6200rpm on Xoar 22x10 wood which is very respectable for 60cc fourstrokes.

https://m.youtube.com/watch?v=ZiA3tE0IY80

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » July 15th, 2014, 12:46 pm

The take off roll was far straighter this time, though she still needed quite a bit of work to keep the nose pointing the right way. Gear retracted nicely and the Boston started to 'sit' in the air like she was suppose to. Much of this flight was flown at just over 1/2 power. The ailerons and elevator were quite responsive without being too twitchy, though I feel the CG is still a little too far aft. I needed quite a lot of down trim to maintain level flight, perhaps the tailplane incidence isn't quite right!

Stall tests revealed an interesting quirk.....she only wants to drop the right hand wing. Straight stalls, and banked stalls (the most dangerous in my view) all dropped the right hand wing. The good thing is that, though the stall broke suddenly, as soon as the elevator was released she popped right out of the stall. The ailerons and rudder being effective right up to the point of stall.

I tried opening the bomb doors which made no difference at all and then set up for a landing. Three wheels down (always a relief!) and a full circuit to a fairly long final approach. The approach was flown (what I thought) slightly fast but as she came over the boundary, you'll notice the nose drop slightly and she starts to sink quite quickly. I really didn't want to haul back on the elevator incase that right wing dropped, so I left her to settle, albeit slightly firmly!

Unfortunately I bent both undercarriage axels and the tyre of the right hand wheel started to come off it's hub....so we called it a day.

All in all I think she flew quite well. She is certainly not the easiest thing to handle, will certainly bite if you push her and I need to work on getting the approach speed just right seeing how far I can 'hold off' the flare.

I'll set to and sort the little issues before venturing out for a few more flights before I strip her back down for the final detailing and paint finish........

Phew!

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Denis Brown
Posts: 294
Joined: December 5th, 2008, 10:03 am
Location: Silksheen, Lincolnshire

Re: Douglas Boston IIIA

Postby Denis Brown » July 15th, 2014, 8:30 pm

Think I need a drink after that !!!!!!!! Well done anyway. I know she will end up being as smooth as silk by the time you have finished.

Bob Johnstone
Posts: 61
Joined: December 7th, 2008, 10:32 pm
Location: Fort William

Re: Douglas Boston IIIA

Postby Bob Johnstone » July 16th, 2014, 10:20 am

Looking good, I hope to see it complete and pretty.

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » July 24th, 2014, 7:49 pm

Thanks Bob,

Another 2 flights completed day! Much better this time around. A change of glow plugs, fuel and a bit more lead in the nose has made all the difference.

Next job is to dismantle it all, degrease everything (that should be fun!) and then I can get started with detailing and painting!

barry banks
Posts: 37
Joined: March 2nd, 2012, 8:02 pm

Re: Douglas Boston IIIA

Postby barry banks » July 24th, 2014, 10:51 pm

Great bit of flying today Steve aircraft looks great loved the scale roll! Some nice pictures on the winterton Facebook page of the jet.

Steve Rickett 2333
Posts: 235
Joined: May 13th, 2009, 8:18 am

Re: Douglas Boston IIIA

Postby Steve Rickett 2333 » July 25th, 2014, 8:38 am

Thanks Barry,

Photos courtesy of Lee Wilson......

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