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RE: Scratch building 105 - 11/2/2012 8:37 PM

Props4ever

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Ok i get it Paul, yeah blenders are scary to be around with unless a lot of precaution is used....U r right on account of electric power plants being more powerful then there glow counter parts, lets see, this will be interesting to see....

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RE: Scratch building 105 - 11/2/2012 9:05 PM

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I’m just saying be careful. I’ve witnessed some pretty nasty stuff and it always seems to happen to people that are very experienced electric power users. It is almost like if you do it long enough you’ll let your guard down and bang, it gets you!

I think if I was dealing with the power you have I’d build a frame to hold the aircraft that you could bolt to a heavy work bench in your shop and you could stake to the ground at the field. Then only connect arming plugs when it was locked down in the fame. I’ve seen a number of motors go to full power when the flyer did not expect it; one was a helicopter that was setting on a field bench. That was pretty scary, almost took the flyers head off.

One of our club members came dang close to burning his house completely to the ground with a LIPO fire. Even if the fire is contained in one area the mess it makes is very hard to clean up. If I was using LIPOs like yours I think I might get a small metal shed and store them away from my house. The inflight fires have been pretty spectacular too.

Not trying to be argumentative, just sharing what I’ve seen and experienced.

< Message edited by 8178 -- 11/2/2012 9:38 PM >

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RE: Scratch building 105 - 11/2/2012 9:30 PM

Slow Low

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quote:

ORIGINAL: 8178

Even if the fire is contained in one area the mess it makes is very hard to clean up. If I was using LIPOs like yours I think I might get a small metal shed and store them away from my house.

I just saw a steel cage locker for storing flammables at a second store this week and I thought to myself, "I wonder if this would do any good in a LiPo fire ??" I almost bought it for the whole $45 they wanted, but in the end it wouldn't fit in my convertible lol at any rate - this point bears at least a little more consideration than I bet a lot of us give it...serious chit happens every day

....looking good Sammy - nice mounts - how about making another carbon piece and bolting to the bench ??

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RE: Scratch building 105 - 11/2/2012 11:41 PM

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quote:

ORIGINAL: 8178

I’m just saying be careful. I’ve witnessed some pretty nasty stuff and it always seems to happen to people that are very experienced electric power users. It is almost like if you do it long enough you’ll let your guard down and bang, it gets you!

I think if I was dealing with the power you have I’d build a frame to hold the aircraft that you could bolt to a heavy work bench in your shop and you could stake to the ground at the field. Then only connect arming plugs when it was locked down in the fame. I’ve seen a number of motors go to full power when the flyer did not expect it; one was a helicopter that was setting on a field bench. That was pretty scary, almost took the flyers head off.

One of our club members came dang close to burning his house completely to the ground with a LIPO fire. Even if the fire is contained in one area the mess it makes is very hard to clean up. If I was using LIPOs like yours I think I might get a small metal shed and store them away from my house. The inflight fires have been pretty spectacular too.

Not trying to be argumentative, just sharing what I’ve seen and experienced.

Your right!
I had a li-pol that I set on the back seat of my wife's 4 year old truck go off, you can't let your guard down with these things, I did and haven't heard the end of it. (I won't let my guard down again, my wife keeps reminding me anyway.

)
And with the type of power available with these things it not like the battery toys we had in the 50's or 60's... A few guy's in our club fly some 1/4 scale electrics, they just as dangerous as any gas power ones, you have to treat them just like they have a DA under the cowl (with the added chance of them spinning up when you don't expect it).

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RE: Scratch building 105 - 11/3/2012 1:16 AM

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Guys,

12 years ago when I began using lipos I made up a storage/transportation case shown in the picture. It consisted of a 16 inch tool box lined with 3/8 dry wall. I feel safe driving 1200 miles with my lipos in this container. I now have 3 of these for storage and transportation.

George

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RE: Scratch building 105 - 11/3/2012 2:27 AM

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quote:

ORIGINAL: ampbomber

Guys,

12 years ago when I began using lipos I made up a storage/transportation case shown in the picture. It consisted of a 16 inch tool box lined with 3/8 dry wall. I feel safe driving 1200 miles with my lipos in this container. I now have 3 of these for storage and transportation.

George

That setup looks real good and it looks like the dry wall in the lid would seal off the lower compartments pretty well too.

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RE: Scratch building 105 - 11/3/2012 8:34 AM

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All these are words of wisdom for me and I will take these as you guys have indicated these to me. Tomorrow I'm going to change some hardware that i'm using right now, from what you guys said, I doubt those 16 wood screws are going to hold on to these mounts on the firewalls for more then couple full power bursts......

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RE: Scratch building 105 - 11/3/2012 10:22 AM

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Flap is being installed in the right flaps bay presently. First CF tube for OB telescopic rod has been glued in the wing at right angle, Inner tube's rear hole's diameter had to be increased a bit to get proper angle, that done with tube dry installed...Dry fitted the flap on its aluminum slider actuator by making a locking notch on the spar location of the flap panel, it's looking pretty good when fully extended as both flaps have same articulation and same pivot angle at full extension....

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RE: Scratch building 105 - 11/7/2012 4:03 PM

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Yesterday I started to feel bit relaxed from the weekend's tiredness, so slowly getting back on last bits of the remaining build. Found 1 Plush 60A Esc NIP, couple extra props, cf pushrods for rudder and elevator control, three 2" 3 blade spinners, out of which one is damaged but will do as mock up to be modified and fit on these large props. I have already marked the pegs in the spinner that will be sanded as 1/4 round shape with drum sander, this will allow prop hub to fit in the spinners easily. I will find out if opening for the blades would also need opening up or not once these pegs are sanded first.

Also balanced 2 of the 4 props, man it's long and slow process, after all 4 props are balanced, they will be painted metallic silver. Same paint will be applied on all 4 spinners also.

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RE: Scratch building 105 - 11/7/2012 4:05 PM

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First spinner modified and adapted to 3 blade prop that will be used on the model has been installed on motor #3!, It got same treatment as first trial spinner did and fitted nicely on the shaft and the propeller...

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RE: Scratch building 105 - 11/7/2012 4:09 PM

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Some pictures from London Swap meet and model display....

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< Message edited by Props4ever -- 11/7/2012 10:36 PM >

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RE: Scratch building 105 - 11/12/2012 10:16 PM

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Bought 12 gauge 20' of silicone wiring from LHS yesterday, 3.5" straight double arm and couple CF rods to extend ones I bought at LHR swapmeet. Can't sit without working on this model as it seems, if I don't do anything to it for 2 days, my hands starts to get that itch to keep on working on it.....

First 2 servos on both OB rudders were connected to the "Y" harness, this will leave me with center rudder, so i'm going to use both OB rudder on main rudder channel on my rx and for the center rudder, i'll put it on separate channel and do the mix with main rudder channel.

When I initially mounted the back plates of the spinners, even though I had to modify the blind nuts by sanding bit off at the ends for the prop adopter to fit flush, it wasn't seating perfectly flat against the back plates, this was causing me worry as spinner wouldn't turn true to the point and at super high rpms, i'm sure these would cause a lot of vibration with chances of damaging the motors!. So I looked at the aluminum prop adopter itself and decided to sand tiny bit off from one of the four corners to make it fit flushed with the back plates. It took little time to make these tiny notches to say the least which in the end worked out really nice. I doubt sanding these tiny bit off from the adopters would cause any balance issues on the rotation of main drum of the motors.

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RE: Scratch building 105 - 11/12/2012 10:23 PM

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I need suggestions as to where would be good place to mount my ESC's inside the cowls and where on the motor mounts. I also have lower air scoops too keeping the wires at standard length, I doubt these could fit in them.

With this Esc there is a battery balancing board also, now how does it works plus this esc also has BEC on it....I will be installing separate 15A esc on this model.

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RE: Scratch building 105 - 11/13/2012 12:02 AM

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Time of consideration is here, where what will be placed in the model electronically...

Placed ECS inside the scoop to see if this would be good spot for it, don't forget front intake of the scoop will be opened for air to flow through it!, scale baby scale!!!!

I took few series of pictures to share this with you all on here to get better ideas so I can make better graduated decision....

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RE: Scratch building 105 - 11/13/2012 12:59 AM

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That looks fine as long as you provide an outlet for the cooling exit keeping the outlet at the 140% ratio to the inlet. Be sure to baffle the interior with foam to keep the air stream as close to the ESC as you can, with just airflow the prop blast should provide I think you will have enough airflow to keep the ESC nice and cool.

Sam, the more I look at those four motors hanging off of that thing the more I think that two batteries are not enough. I would wire it so that all four motor's/ESC's have home runs for the batteries to the center battery compartment anyhow using 12 gauge wire (10 gauge if I ran it as a buss) and use a Y setup to connect the four ESC's to your two batteries. That way if you need more power you don't have to do anything but add another pair of batteries and lose the Y's. I have got the feeling that thing is going to suck up a lot of power in a short time. As a matter of fact I'd have a good size battery for the radio and servos themselves, you have a lot of electronics on that plane and I'd doubt that you have much more than a minuet to a minute and a half's worth of power for everything, along with the motors.

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RE: Scratch building 105 - 11/14/2012 1:57 PM

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Paul,

My friend n I have done calculations with this battery set up and we got 5-6 mins flight time at 50% to 60% throttle while cruising Max thrust at full power we got was 40lbs!. More then 1:1 power to thrust ratio here... Now after what you said, I have decided to make parallel adopted extension harness to add couple more lipos if ground taxi tests showed time to be shorter then what we got in reality.....I'll find his pm with our calculations n will post numbers on here...

Here is the calcs;

http://www.ecalc.ch/motorcalc_e.htm?...tch=8&blades=3

Look reasonable. If wing loading is average than you are fine.

power 4 x 830W = 3300W
thrust 4 x 3100g = 12050g or 40lbs

This gives 110W/lb power to weight
see http://www.e-fliterc.com/Articles/Ar...ArticleID=1563

Remember these are estimates, calcs are only as good as the data in the the database. Generally, this calculator in pretty trustworthy.

< Message edited by Props4ever -- 11/14/2012 3:11 PM >

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RE: Scratch building 105 - 11/14/2012 4:32 PM

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You also have to figure in the power draw for the servos and receivers. Just in servos alone your going to have a fair amount of load, the receiver itself has a low draw but with all the servos that will change things.
For most of my electrics planes I like to be in the 150w/lb range for good solid performance, my little delta is actually nutty range with around 500w/lb, and with that I only have a 3 min flight time.

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RE: Scratch building 105 - 11/14/2012 4:58 PM

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I see now where you are coming from, NO servos will be powered separately from another battery, since I'll be using separate 15A BEC, I will be able to power them on another set up. This way there will be 2 power systems on board, one purely for the motors and esc's and second for the servos. If you combined all the servos to the same main power lipos, yeah your are right then.....

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RE: Scratch building 105 - 11/14/2012 5:16 PM

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Lookin' good!

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RE: Scratch building 105 - 11/21/2012 10:20 PM

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Today in London, ON's local community newspaper....

http://www.londoncommunitynews.com/2012/11/model-aircraft-swap-meet/

"Brothers Sam and Yasir Haqqi from Mississauga, pose with the 1:14 scale replica of a Super Constellation that took six years to build from scratch. The brothers hope to have the model of the storied plane airborne within two weeks."

My Quote of the day-
"Scratch builds has life of there own with no time limits or predictions on the it will get completed, it will when it will"

< Message edited by Props4ever -- 11/22/2012 9:49 AM >

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RE: Scratch building 105 - 11/21/2012 10:22 PM

Props4ever

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Another recognition today in Connie Survivor's site:

http://conniesurvivors.com/1-connie_news.htm#NOV21

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RE: Scratch building 105 - 12/1/2012 6:27 AM

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For last few months I have been trying to achieve a throttle scale sequencing start up set up but all the past trials have gone to a wall until now. 3 weeks ago I contacted horizon hobbies tech department and asked how can I do this on my new DX 18 with all bells and whistles, initially they said it's not doable and there is no way of doing it. OK !, i was not impressed but didn't gave up, so a week later I called again and talked to head of the department, he took time to fully listen and understand what I wanted and then went through the systems and programmings to do this sequential set up but wasn't able to, yet he really liked the idea and said, let him work on it but no promises.....well couple days ago I got a email and call from them and you won't believe it but tech department actually took my requirements and spces and created a program with 2 options to achieve my goal!....Tonite I very happy to say my Spectrum DX18 is the only radio out there who has a capability to start all 4 engines on my Connie with scale starting and idling sequence as 3 - 4 - 2 -1, once all for motors idle at 15% throttle setting, then primary throttle stick does take over full throttle control as normal.....

Tomorrow I have a friend coming who will make power wire harness for my model, once they are made and installed in the wing, I will do first all 2 engines start up on the Connie!!!!!!

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RE: Scratch building 105 - 12/2/2012 12:48 AM

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as i post this, all 4 motors, esc's, all the wiring is installed in the wing and nacelles. At 3pm first test with single engine hooked up and was powered up for the first time, it was a blast to see the wing under power!!, at 1/2 throttle wing started to move forward on its own and stuff in the back side was blown off, She is very powerful bird !!!!.

In about 1.5hrs, I will start all the engines with new DX18 and scale start up and idle sequence as 3- 4- 2- 1 feature developed with my specs and requirements by Horizon Hobbies just for my model !!!....

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RE: Scratch building 105 - 12/2/2012 9:49 PM

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First video shows you how scale throttle start up and idle sequence shows on the screen of the TX.

Start up and idle sequence on my Connie is engines 3 - 4- 2- 1 , this can be changed to any other sequence plus you can change your idle percentage to as low as motor and esc will allow before cut off. In that regard you have full throttle control on you throttle stick.

Sorry video can't be directly uploaded, i'll upload it on my Youtube account and post it's link there, this will be same for first engine start up test and demo to PIA officials last night at a dinner I gave them.

We couldn't solder on last 2 EC5 connectors that would connect to battery connectors, nin time last nigh so therefore I couldn't run all 4 engines for PIA officials and demonstrated single engine start up and runs....

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RE: Scratch building 105 - 12/2/2012 10:15 PM

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