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robot797's

"cox 049 gasoline"

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Post  John Goddard on Tue Jan 08, 2013 5:51 pm

Just a few piccies guys.
Mosta the donkey work now done, just gotta connect port aileron and mount mota/throttle.
With the Extreme it balances right on the money but I still think first flight will be with a black widow.
It's a little porkier than I'd have liked but it does have digi metal geared servo's that if I decide to swap
will shed 3/4oz straight away, along with perhaps junking the adjustable ball links 1/4oz and smaller battery
1/4 oz currently 220mah thinking of 120mah.

Hopefully will maiden this weekend.

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Post  Cribbs74 on Tue Jan 08, 2013 6:07 pm

If you want to save some weight get rid of the gear and put a bellcrank in it. lol!

Just kidding, looks like fun John.
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Post  John Goddard on Tue Jan 08, 2013 7:31 pm

2013
Is the year it WILL happen Ron..
Very Happy
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Post  microflitedude on Tue Jan 08, 2013 8:17 pm

That thing is going to break the sound barrier...

Very Happy
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Post  RknRusty on Tue Jan 08, 2013 11:12 pm

How much does it weigh, John?

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Post  John Goddard on Wed Jan 09, 2013 4:32 am

Hi Rusty, what you see there is 260grams in
New money. I reckon 275 with throttle servo
And a smidgeonette of fuel proofer.
I had really hoped for sub nine oz but given the
Amount of over engineering I've done I
Shouldn't grumble.
The original kit I bastardised was 22in w/s with
A projected AUW of 8 oz with TD 020
Up front. I scaled up by 1.18/ to accommodate an
049.
Very Happy
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Post  Dizzyman2011 on Wed Jan 09, 2013 4:43 am

Wow looking good bet that's gonna go nicely like the colour scheme looks to be good fun all that area and power with little weight the field is beckoning John listen to the voices we need video !!
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Post  Kim on Wed Jan 09, 2013 6:05 am

Ditto what Dizzyman said, John. We need to see and HEAR that rocket !!!!! Great looking little monster !!!!!!!!!!!!!!!!!!!!
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Post  ian1954 on Wed Jan 09, 2013 8:49 am

Hi Jon,

I remember your previous quote on what to do with an engine.

Re: Cox Christmas gifts
John Goddard on Mon Dec 03, 2012 11:12 am

.+
----
-You could always stick one on a plane Ian
.


I have been waiting to learn how ever since and now I see how easy it is! A mere application of some parcel tape is all that is required!

I had used "Blu Tack" but the motors kept falling off! I will be away to the shop straight away.

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Post  RknRusty on Wed Jan 09, 2013 10:30 am

The Extreme should haul 275g around pretty well, fast enough to be fun.

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Post  John Goddard on Wed Jan 09, 2013 11:03 am

ian1954 wrote:Hi Jon,

I remember your previous quote on what to do with an engine.

Re: Cox Christmas gifts
John Goddard on Mon Dec 03, 2012 11:12 am

.+
----
-You could always stick one on a plane Ian
.


I have been waiting to learn how ever since and now I see how easy it is! A mere application of some parcel tape is all that is required!

I had used "Blu Tack" but the motors kept falling off! I will be away to the shop straight away.


Don't tell everyone Ian but I've got a secret tool that fixes everything reeeel good.
Very Happy
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Post  John Goddard on Wed Jan 09, 2013 11:08 am

PS
Seriously though
Have any of you guys any experience running your radio's on 1s lipos?
Just another hair brained idea to shed a few grams....
PS
Mine's Futaba so no 'brown out' issues to worry about.
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Post  John Goddard on Wed Jan 09, 2013 5:01 pm

I think I may have made my own mind up........

On the left 220mah weighs 22 grams

On the right 130mah weighs 5 grams

Unless one of you screams 'don't do 3.7 volts'
I think it's a no brainer
Flying

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Post  ado1974 on Wed Jan 09, 2013 6:25 pm

john

if you want to guarantee no brown outs on 1s lipo try one of these(i love futaba but they can still brown out on 1s, i have seen it happen)
http://www.dimensionengineering.com/products/lvboost

actual weight of the one i have in front of me is 2.85g and it still has 180mm/7in of wires hanging out of it!

i havent used it yet, but have only heard good reports about them.
wire it into the rx only and power the servo straight from the battery for best results.
although i have heard of guys running servos and rx through the lvboost, the current required could be a little high(try it and see)


cheers
a
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Post  dirk gently on Thu Jan 10, 2013 2:56 am

Remember that with the voltage converter, the battery is no longer 130mAh, but much less, below 100mAh (even assuming 100% effectiveness of the converter).
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Post  John Goddard on Thu Jan 10, 2013 3:17 am

Cheers Ado, I was thinking about similar.
I did loose a model early on in my re entry to hobby.
It just flew away and I put it down to low batt or disconnected
Rx batt/ it was an old 35meg Futaba though.
Dirk yep I know but it's only going to have enough fuel to
Fly a couple mins and I'm a 'serial' on site charger so I'll
Just top up after each flight.
Oh oh tempting fate.... It's going to fly more than once
Very Happy
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Post  ado1974 on Thu Jan 10, 2013 4:39 am

dirk

good point on the mah of the battery.

i havent been around herre for very long, but im sure john is the type of guy that will bench test everything thoroughly before taking it out for the maiden. we all do that dont we?... lol!

....john, please make sure you get it on video... looks like it will be a heap of overpowered fun RC Plane

cheers
a

p.s.
when you take it out for a maiden,
by making sure you only have one battery and leave the charger at home..
... will gaurentee it lands safely.
(has to work... when i go fully prepared... it usually doesnt end well) Sad Goodbye
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Post  Surfer_kris on Thu Jan 10, 2013 5:09 am

I have used the small 150mAh batteries before but I prefer to use the 2/3 AAA ones, at about 450mAh. That way you can be sure to get several flights in without worrying about the batteries. The total weight can still be around 10oz. I have a Yellow Jacket with three channels that weights about 10.3oz with a Norvel .061 in the front, it moves around quite nicely...
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Post  John Goddard on Thu Jan 10, 2013 5:54 am

Whisper it Kris...
There's an AME061 waiting in the wings courtesy of MFD Matt.

There may be another Dragonfly on the the firm as well..
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Post  John Goddard on Fri Jan 11, 2013 4:44 pm

OK
Flight ready with Dragonfly tank/back end, 5 servos, 130 mah 1s lipo (poss the 300mah might turn up in tomorrows
post) All Up Weight 285 grams.
Ie almost exactly 10 oz's.
I reckon that the 'Extreme' is putting out at least as much power as a Tee Dee (78 watts)
So I reckon on 125/130 Watts per pound, not my usual 250+ but it should still be spritely.
I held the engine and threw/shook it around to simulate 3d nonsense and it continued to run well.
I think it was Kris who suggested the dragon fly set up.
I works very well albeit at the cost of weight.
Very Happy

If the rain and snow holds off tomorrow it'll maiden.
Cameraman Glen will be there so hopefully there'll be a vid.
Flying
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Post  RknRusty on Fri Jan 11, 2013 7:55 pm

Yes! Looking forward to it.
I'll have my camera out tomorrow too. Re-testing the Li'l Satan with it's newest Tee Dee, the maiden of my new Baby Streak with it's Big Mig, and of course my old faithful Streak which I may now call the Lead Sled since it weighs at least an ounce more than the new Baby.
Weather forecast is Sunny and 78F, with 9mph wind. Maybe the trees will break the breeze.

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Post  John Goddard on Sat Jan 12, 2013 5:00 am

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Post  microflitedude on Sat Jan 12, 2013 7:30 am

John Goddard wrote:Eighty degrees!!!!!!!!?

http://www.windfinder.com/forecast/london_city_airport

We have a high of 81 over here.
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Post  RknRusty on Sat Jan 12, 2013 7:45 am

John Goddard wrote:Eighty degrees!!!!!!!!?

http://www.windfinder.com/forecast/london_city_airport
BBBRRRRR! Cold and windy.

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Post  John Goddard on Sat Jan 12, 2013 11:58 am

Ok ok it's time for those 'told you so' comments...
lol!

While a 1s lipo will work fine in a centrally heated office, outside
In f f. F. F ffffreeeeeeezing temps it's another story.
It was so cold that it took nearly 20 mins to get the beastie
To run by which time the throttle servo kept closing due to
Low voltage.
Guess who forgot to take the nimh as a spare.....
So no Maiden.
But on the plus side engine was happy at 19.5k with
Standard low comp head, 20% and model wanted
To leap skywards.
Ah well next week....
DAMMIT!
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