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Old Apr 22, 2001, 10:49 PM
Registered User
Hemet, CA. USA
Joined Apr 2001
8 Posts
Sig lt25

Hi all
Geting ready to build LT25. Thinking about A pair of Astro 15 FAI geardrive's Or Astro 25 FAI geardrive. I have both Been building and flying Electric planes sence 1988 So not realy new to this. Also self taught myself with Electric. "PT Electric" Than everything that Ted Davy made. So any way what do you think. PS will have flaps and ailaron. "cant spell" Roy
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Old Apr 23, 2001, 12:08 AM
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ScottS's Avatar
Houston,TX
Joined Mar 2000
1,217 Posts
PAIR? Do you intend to bash it into a twin? Sounds like you intend make sure it is sufficiently powered. Should be fun, my LT25 flies fine with only 1 AF15G.


[This message has been edited by ScottS (edited 04-23-2001).]
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Old Apr 23, 2001, 12:12 AM
H2OFLY
Portland Oregon USA
Joined Feb 2000
2,509 Posts
My LT-25 flys fine as it is; would really be neat with two motors - and if you hinged the nose you would have to make, you would be able to change the battery very easily.

I prefer more power, rather than less (be quiet, Bernard) so I would use the AF25 rather than one AF 15...but TWO AF15's would really be cool! The model will easily carry 20 cells, incidentally - and fly well at 8.25 pounds, on floats.

Go for the Twin!

Terry
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Old Apr 23, 2001, 09:21 AM
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Winnipeg, MB Canada
Joined Jan 2000
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Mine flies very nicely as a trainer using the AF 035 and superbox. 8x2000's has the weight at 70 oz and the ability to use BEC. 10 mins of training including T&G's on grass. Tex.

P.S. This is not to suggest an ideal solution to you, it's merely as a reference for the power needs of this great little plane. T.

[This message has been edited by Sabrejock (edited 04-23-2001).]
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Old Apr 23, 2001, 11:05 AM
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San Antonio, TX
Joined Mar 2000
185 Posts
I have a pair of 05Gs that I am looking for a twin project for, the LT25 is one I considered. I had a glow version once, flies very well. As Terry notes, that big nose could easily be made into a battery hatch...
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Old Apr 23, 2001, 11:59 AM
Registered User
Olathe, KS USA
Joined Nov 2000
35 Posts
A couple of 015s would be more than enough power. Should really scream! This planes flies well with just on geared 05.

I did someting similar a couple of years ago and built one with 3 .15 glow engines. The planes flew very well and the sound was....(lost for words). In this configuration, the plane would fly on any two of the three engines. All I did different was to take out the diheadrial, sheet the wing out to the outboard motors and use hold-down bolts instead of rubberbands. I beefed up the rib that held the wing motors by cutting a new 1/8 light ply rib and glued a 1/8 aircraft ply pylon to hang the motors from. Other than this, the plane was mostly stock. I built another one of these with leading slots and slotted flaps. I also took out the +3 degree incendence(sp?) of the main wing. With about 30 degrees of flaps, I could hover it in with a 5mph head wind. (It was powered with a FP .40 with a 11x4 prop). I would definitly try to make the flaps slotted as simple flaps will ballon the plane something terrible.

I have a couple of images of the tri-motor on my site at http://cj626761-b.olathe1.ks.home.com/
Just look under "My Planes". The LT25 is the blue and white one.

Good luck with your project.

Ron

[This message has been edited by rfrenzl (edited 04-23-2001).]
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Old Apr 23, 2001, 10:34 PM
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Hemet, CA. USA
Joined Apr 2001
8 Posts
Thanks All
My thoughts also. I will go with tmin with sloted flaps. Scratched A Britton Norman Islander. With twin Astro 05's slotted flaps. Flew very well. Looked real neat in air. Maby I will make it so that I could make it A tri-motor. Realy I think I will shorting nose and make the nose into A battry hatch. Thanks again Roy
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Old Apr 24, 2001, 12:31 AM
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Moorefield, Ontario, Canada
Joined Mar 2001
315 Posts
I've done a twin LT-25. Take a look the picture at the bottom of:
http://www.capable.ca/rcstuff.html

Stefan
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Old Apr 24, 2001, 08:32 PM
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San Antonio, TX
Joined Mar 2000
185 Posts
Ron & Stafan--nice planes, I may have to try this....

Just curious Stefan, why trike gear? Any thoughts on benefits of counter-rotating props?
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Old Apr 24, 2001, 09:56 PM
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Olathe, KS USA
Joined Nov 2000
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Patrat, depending on the props, counter rotating them is little to no value except they look good. Because of the size and rpm, little props just don't generate enough torque to make a difference. If you use geared motors and big props, then this may help. Since there is little chance of a "flameout", counter-rotating props add little to the flight performance.

If you got 'em, use 'em.

Ron
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Old Apr 25, 2001, 01:55 AM
BEC
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Auburn, Washington USA
Joined Jan 2001
12,939 Posts
Quote:
Originally posted by Terry:
My LT-25 flys fine as it is; would really be neat with two motors - and if you hinged the nose you would have to make, you would be able to change the battery very easily.

I prefer more power, rather than less (be quiet, Bernard) so I would use the AF25 rather than one AF 15...but TWO AF15's would really be cool! The model will easily carry 20 cells, incidentally - and fly well at 8.25 pounds, on floats.

Go for the Twin!

Terry
Why should I be quiet?? I think this twin 15 powered plane would be right up your alley (but is probably twice what is needed). Mine will almost do outside loops at 350W (one Aveox 1114/4Y on 10 cells) - but not with floats on - yet...... <g>
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Old Apr 25, 2001, 07:51 PM
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Zebulon, NC
Joined Aug 2000
5,086 Posts
Quote:
Mine will almost do outside loops at 350W (one Aveox 1114/4Y on 10 cells) - but not with floats on - yet...... <g>[/B]
Only 350W? hehe With my astro 15 and 14 cells with an 11x7 prop im showing 475 watts on my wattmeter, it flies like it too.

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Old Apr 27, 2001, 12:32 AM
H2OFLY
Portland Oregon USA
Joined Feb 2000
2,509 Posts
Power? Let's see - 35 amps out of 21 cells, into the 14x7 on the nose of the 6:1 Superbox, turned by the MaxCim brushless...

It is enough to tear up the sky at Pine Hollow float plane contest...and terrorize the other electrics there. Just couldn't overcome the fun fly thingies with piped OS 32's, though...three and a quarter pounds on a central float with outriggers! (That's the thingey... my Lt-25e was Eight and a quarter pounds - that's why I wanted 21 cells. Ah, the joy of throttling back =8-)

Terry AMA # H20FLY

Is there a 12-Steps program for power-hungry flyers?
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Old May 05, 2001, 09:49 PM
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Hemet, CA. USA
Joined Apr 2001
8 Posts
Hi All
Thanks. I have chose to go with the Astro 15's These have 7 turn 05 armature. Power very close to 15 FAI. with A gear box 2.33 and with 12x6 or 12x8 prop's. On 20 cells in series. Will have sloted flap's. Just enfough diehedral so that it dosent look like anhedral. Thanks Roy
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Old May 07, 2001, 01:27 AM
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Fred Bronk's Avatar
In Heli Wonderland
Joined Aug 1999
22,801 Posts
The plane sounds nice! But have you thought about a higher ratio with those props?

Those props sound awfull big for a 05G, much less at FAI amps!

I run a 11-8 MA Scimatar on 10 cells on my 05G at 25 amps. (300 watts)

I also have a 15G with a retro 3.6:1 ratio on a 12.5-8 3 blade that pulls 25 amps on 16 cells just for comparison sake. (over 500 watts!)

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