GUPPY electric sailplane Building&flying PART 1 - Page 34 - RC Groups
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Mar 05, 2007, 02:55 PM
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ultralajt's Avatar
The only, and by my opinion the best solution is using one of 400 size brushless outruner as Welgard A22/12/15 (as I mentioned before), or similar one (these days the brusheles are similar as egg to an egg) so it will fit inside Guppy nose on the exsisting original firewal. Look at the drawing on my previous post. I believe it is easy and efficient conversion to brushless power.

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Mar 05, 2007, 03:01 PM
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Originally Posted by Iso Octane
Just entertaining the idea of fitting in a GWS style gearbox with a 20mm brushless. Geared up for a 9" prop.

Firstly, it absolutely doesn't fit in the nose. Could place it further back and run a shaft, but that might throw off the CG. Then where am I going to find a 9" folding prop for a 2mm shaft?
Depending on which GWS GB (300 or 400) you would need either a 3mm or 4mm spinner set... both of which are available.

I have been recently thinking of that combo (Himax 2025-4200 and EPS 400 GB) as it is about half the price of a Hacker B20 and provides steeper gearing choices than the Hacker/Maxon 4:1.

Some of my 2M gliders are wooden fused and coverted to EP via the razor-saw, so they are not as pretty or as sleek as FG fuses. My plan was to build a nose cold air vent that would provide the needed clearance for the GB top.

Maybe one of these days.

Mar 05, 2007, 03:27 PM
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Iso Octane's Avatar
Thanks for the feedback guys.

I have the gearbox-motor combo laying around, which is why I want to go that route. I also like the idea of spinning a bigger prop, and the flexibility a gearbox provides.

The outrunner solution seems to be the easiest way (besides having to buy one) to swing a bigger prop, so it's likely I'll be doing that.
Mar 05, 2007, 04:57 PM
No drugs to fly high
oracle_9's Avatar
My guppy uses a welgard 22/12/10. Still havent test flown it, maybe this weekend.

I did a static test on it a few weeks ago, here is what I got:

My setup:
8x CBP750 nihms from cheapbatterypacks $10
Corona 620 dual conv receiver $18
WA22/12/10 from Grayshobbies $21
Graupner 7x4.5 folder CAM prop with spinner $20
Bidproducts 20A BEC controller $15

This produces about at full throttle 385g (13.8oz)
With 8x4.5 graupner Schmit folder prop, its 450g (15.9oz)

I didn't have 9" props, but they definitely produce even more thrust.

I didn't have the firewall at the nose as in your diagram, rather, the firewall is on the rear of the motor. Otherwise you would have the wires in the way or hanging outside the fuse.
Mar 05, 2007, 09:53 PM
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Yee Haa, dang you guys are getting set to have some high climbing Guppies! Hacker A20-20L's and B20's! That should do it for sure:-) I have a B20 18L on 3 cells on my 2 meter WindDancer and I can hold it vertical by the boom, turn on the motor and launch vertical! Not sure this isn't a little over kill for the Guppy:-))

On my Guppy I have a little home made CD rom motor, weighs 28 grams and a 6/3 folder on 3 lipo cells. I havn't tried it yet but I'm pretty sure it will be plenty. I just carved the fuse round to the diameter I wanted in the front and then hollowed out the nose inside from the front with a dremel tool with a drum sander on it to the correct depth for the fire wall. Wires inside. I'll let you know how it works.

One thing I'm sure of is that there have to be plenty of small, inexpensive brushless motors that will work great and be a whole lot more effecient than the old S-400.

Keep reporting on motors and combinations guys, this is one area where i don't have a lot of time to experiment and I would like to be able to offer a power system as well.
Mar 05, 2007, 10:22 PM
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rdwoebke's Avatar
Originally Posted by dennymaize
On my Guppy I have a little home made CD rom motor, weighs 28 grams and a 6/3 folder on 3 lipo cells.
Hey Denny,

I have a very similar motor in that little 40 inch span converted Ionosphere hand launch. I run a 6x3 folder and 3S lipo. 20 turns of 26 guage terminated in Y. Seems similar to the speed 400 DD output at about half the weight.

Mar 06, 2007, 01:07 AM
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ultralajt's Avatar
Here is also one of effective power combination for the Guppy, that is already proven. Motor is mounted as I show earlier on this drawing:

motor: ROXXY BL-outrunner 2824-34
speed controller: ROXXY BL-control 818 (6-10 NiXX or 2-3 LiXX)
accu: INTELLECT 2/3 A 1200 mAh 8 cells
prop: aeronaut 9x7 folder
Last edited by ultralajt; Mar 06, 2007 at 01:13 AM.
Mar 06, 2007, 07:46 AM
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ultralajt's Avatar
I think it is time to again gather all crucial info at one place….
…so, what we have here till now?



guppy ilk duzgun ucus (1 min 21 sec)

Guppy HOT (4 min 14 sec)

Guppy sailplane (2 min 15 sec)

Guppy electric sailplane (2 min 16 sec)

Guppy RC Plane (3 min 6 sec)


KIT producers:

Varies internet adresses, where additional information about building the Guppy is available:

So much for now!

Last edited by ultralajt; Mar 06, 2007 at 11:36 AM.
Mar 06, 2007, 08:26 AM
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Carl Petersen's Avatar
A few bad links but very useful. Great idea.

(Actual links can't have "..." in them)
Mar 06, 2007, 08:58 AM
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ultralajt's Avatar
Originally Posted by Carl Petersen
A few bad links but very useful. Great idea.
(Actual links can't have "..." in them)
You are right!

I must check all that links and erase those that seems to be "dead".

It will be quite time consuming to check them all, but I think I will manage till weekend
Any hint about apropriate server where I could upload important files, will be accepted with joy!

Some servers simply delete files if users dont download them often.

But of course if someone is interested about some plans, I can send them by E-mail. Just tell me what you want and give me your email address.

But please, dont ask from me vectorised files for the CNC cutting. Those files are reserved only for the and future KIT producer in Europe.

Mar 06, 2007, 09:16 AM
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Carl Petersen's Avatar
Last edited by Carl Petersen; Mar 06, 2007 at 12:22 PM. Reason: Links updated.
Mar 06, 2007, 07:56 PM
Make Flying Fun

Hotliner Wing Plans...Untiled ?

Originally Posted by ultralajt
Of course, the completed manual for the Hotliner wings will be soon available!
Can print my wings full sized...any untiled pdfs' ?
Mar 07, 2007, 03:31 AM
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ultralajt's Avatar
Mar 07, 2007, 07:56 AM
Make Flying Fun
Sorry, I guess the email server has limit smaller than the file? didn't receive it!
Mar 07, 2007, 08:27 AM
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ultralajt's Avatar
Yes, I tried already twice and got the message:

This Message was undeliverable due to the following reason:
Your message was not delivered because the return address was refused.
The return address was "<>"
Please reply to <>
if you feel this message to be in error. The following attachments have been removed from the bounce message: GUPPY-HOTLINER wing plans-A1.pdf

Dont know what to do next....

The attached file was 545KB of size.


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