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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Anyone thought of stretching a 450 to 500 for scale use?
07-31-2012 10:40 PM  9 years ago
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cap231ex

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Muncie , Indiana , USA

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Anyone thought of stretching a 450 to 500 for scale use?
Well I've stretched a T600 into a T700 , a T550 into a T600 , aT500 into a T550 , and now a T450 into a T500.

Now one might ask why?

The answer is simple , all the scale projects I have done to date room is a premium and very hard to make more than what you are given.
Many of the projects I have built 500-700 in size I would have liked to added a cockpit and other interior items but inthe end there just wasn't room do to the mechanics.

So a while back that got me thinking , what if I was to use a smaller mechanics?
So I begin my first stretch project a T600 to a T700 to be installed in a Fun-Key Long Ranger , which fit very well and easy and works very well.
Next was a T500 to a T550 which I plan on installing in a Fun-Key .30 size AS-350 and is has worked out great too.

I then went on to stretching a T550 into a T600 wich doesn't have a home right now but I'm thinking about installing it in a AH-1 Cobra maybe.

So back to the project at hand , a T450 I have stretched to a T500 which I plan on installing in a TF-Models EC-145.
And I can tell you this thing is a brick at 2lbs. 5ozs. for just the fuselage only , so Ihave been testing the airframe thoroughly.

Currently I am testing it with a 2lb steel block of ballist zip tied to the under side of the airframe to simulate the fuselage.
But as you can imagine there are some bugs to work through, the one big one I am dealing with right now is the motor.

Spinning a 4-blade CopterX rigid head with 425mm CF narrow scale blades and 80mm tail blades is working the motor I am using (a Z-Power 10) over time. Causing it to heat up over 160*F and causing the 55amp ESC to cut it off and back on in flight.

So I think I will be changing it out for a Scorpion 2221-10 to keep my HS in the same range I'm at right now 1880.

Other than the motor over heating issue I'm currently working on everything else is working just great and the airframe seems to be able to carry the added extra weight that will be the fuselage around just fine. Infact it really seems to help stabilize the heli in windier conditions and according to data from the ESC it is only pulling 29amps so the over heating motor has me puzzled.

Any how here is what I've got going on with it so far , pics and a short video that shows at the end the motor cutting out and me landing the heli safely.

[url]http://

Watch at YouTube

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07-31-2012 10:48 PM  9 years ago
Tag1260

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Ohio USA

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Sounds like an interesting project. Keep us posted how it's going. Any way to use a 500 size motor in place of a 450 size? Or even something in between?
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07-31-2012 11:21 PM  9 years ago
cap231ex

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Muncie , Indiana , USA

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Not a 500 size motor , but the motor I'm using is bigger than a typical 450 size motor but still has the 3.17mm shaft I need.

I've been looking into EDF motors , I've found a few that have a larger can size but again still have the 3.17mm shaft size to fit a 450 pinion.

I did find a EDF motor I think would have plenty of punch but it had a 4mm shaft size and I don't have any way to turn it down to 3.17mm.
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08-02-2012 12:29 AM  9 years ago
cap231ex

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Muncie , Indiana , USA

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I changed from an 11t pinion to a 10t pinion and was able to get a 7:30 minute flight out of it and the temp of the motor at the end of the flight was 148*F.

Also it never cut off or lost power during the flight , but I still think I'll be swapping out the motor soon.
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08-06-2012 10:44 PM  9 years ago
cap231ex

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Muncie , Indiana , USA

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Well I installed the Scorpion 2221-10 motor in the airframe and have been performing pod & boom tests with ballist weight added.

I am happy to say that it seems to have solved the earlier issues with both motor cut out and high motor temps , as well as reduced viberations.

I am currently awaiting some new batteries I have ordered just for this heli , 4000mah 40C 3s packs x3 and will continue to do a couple more pod & boom test with them before getting to the fun stuff installing the mechanis in the fuselage.

BTW I have reconfigured my TC's , now I am running 1380 on Normal , 1450 on ideal up #1 , and 1530 on ideal up #2.
All seem to work out very nicely with the added ballist weight and should be fine once installed in the fuselage.
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08-14-2012 08:17 PM  9 years ago
cap231ex

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Muncie , Indiana , USA

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Dry fitting the 450 stretched mechanics
Well I finally got some time to dry fit the stretched 450 mechanics in the 500 size EC-145.

I think with a little more modifying of the airframe I could hide the mechanics up in the doghouse except for the motor.

But for now on this one I think I'll keep the airframe in its stock form to keep things simpler.

Keep in mind everthing is just setting in place not glued or screwed at this time but roughly in the position it will finally be in.

The first pic shows the total weight tested in pod & boom mode with 2lbs 8.5ozs of ballist weight added to sim the fuselage.

Here's the pics , enjoy

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08-14-2012 08:24 PM  9 years ago
Tag1260

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Ohio USA

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Looks good. How about a couple pics with the nose on it? Like to see how the head sits in relationship to the fuse.

Tag
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08-14-2012 09:59 PM  9 years ago
cap231ex

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Muncie , Indiana , USA

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I had to do some triming on my front plywood mounting point that's why I didn't have any on the pervious post.

But got it cleared and here you go , this is about where it will be when finished.

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08-14-2012 10:03 PM  9 years ago
Tag1260

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Ohio USA

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Looks good but... Aren't you worried about blade strikes? Seems like there's not a lot of room there.
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08-14-2012 10:26 PM  9 years ago
cap231ex

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Muncie , Indiana , USA

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There is really more space between the fuselage and the blades then looks in the pics. LOL

Also the head is kinda just setting on the shaft and doesn't have the jesus bolt in it so it is lower then it will be once bolted.

If you look at the real 1:1 EC-145 it's head sets very low down to the doghouse as well.

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08-14-2012 10:28 PM  9 years ago
adamsz06

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Geilenkirchen Germany

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Looks tight back there...how long are the tail blades?R.I.P. Roman
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08-14-2012 10:42 PM  9 years ago
Darthdrk

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Munford, Tn

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Ive stretched a 300-400 size into a 450 . lighter weight turned into longer flight times.
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08-14-2012 10:43 PM  9 years ago
cap231ex

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Muncie , Indiana , USA

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Tail blade are cut down Blade mCP X main blades cut to 80mm to get as close to the real 1:1 in scale size as possible.

Actually there is quite a bit of room for them I could go much larger but then they wouldn't look right.
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08-16-2012 01:34 AM  9 years ago
cap231ex

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Muncie , Indiana , USA

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I got the mechanics installed for good this time , well the mounting rails that is.

So far so good as everything seems to be going as planned (knock on wood).

I have yet to start working on the raised tail mechanics , but so far the balance is looking real good.
I sure that once I get the raised tail section and tail rotor gearbox installed it well be tail heavy , but I have plenty of room to move the battery around and or even make a full cockpit for it.

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08-17-2012 03:58 AM  9 years ago
cap231ex

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Muncie , Indiana , USA

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Been working on getting the tail rotor assembly installed , it ended up a bit higher than I had originally planned. But what ya going to do?

I had ordered 2 longer drive belts from SDP and it took the longer of the two.

The original one that came with the fuselage for a 500 airframe only came halfway up the raised tail with the 450 airframe.

Well any who , here are the pics.

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08-17-2012 12:29 PM  9 years ago
Heli143

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Phenix City, Alabama

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Looks good!
It will look even gooder when the lettering is on.

Thanks for sharing!
Roy Mayoral
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08-18-2012 12:48 AM  9 years ago
cap231ex

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Muncie , Indiana , USA

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Gooder !!!

Is tha even a real word?

Thanks for looking.
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08-18-2012 08:55 PM  9 years ago
cap231ex

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Muncie , Indiana , USA

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Snaped a few pics of the raised tail and 450 mechanics to show before I install them for good in the fuselage.

Still tweaking on the raised tail section trying to get it to run smoothly and reliable.

If it wasn't for me working with both 450 and 500 parts to make this all workout I would entertain the ideal of running a TT drive tail on this project.

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08-27-2012 08:43 PM  9 years ago
cap231ex

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Muncie , Indiana , USA

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Been a while but I've been working slowly on the EC-145 and ran into an issue with the tail rotor pushrod.

The one that came with the fuselage was just a tiny stiff wire inside a plastic tube and at the turn-up on the raised tail was binding quite badly.

So I swapped it out for a Sullivan Golden Rod pushrod and it seems to have fixed the issue and gotten rid of the tail wag.

I thought about doing a bellcrank setup but there just isn't any room to do so.

I have a few more things I need to tune on and I'm waiting for a 9t and 11t slant pinion to use with the new 450 slant main gear, but things seem to be going as planned.

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10-13-2012 06:21 PM  8 years ago
cap231ex

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Muncie , Indiana , USA

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Well been a while but here is the finished product , and if I don't say so myself she is a beauty.

It flies with a HS of 1540 and with my Blade 400 tail speed up mod she has all kinds of tail authority along with the cut down (80mm) Blade mCPX main blades.

The old girl flies like a dream for 8:30-9:15 minutes on one 4000mah 3s pack but she carries 2 up front for correct CG.

I may at a later date make a full cockpit and interior for her put for now I just enjoy blowing the guys at the fields minds when they look inside it and see the 450 mechanics.

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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Anyone thought of stretching a 450 to 500 for scale use?
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