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Old May 23, 2008, 07:19 AM
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Joined Apr 2008
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is this a good prop and motor to go in the guppy.
http://www.hobby-lobby.com/speed400.htm - 400speed, says it has a 2.3mm shaft diameter.
https://www.hobbycity.com/hobbycity/...peller_6x4inch - closest thing to the recomended 5X4 for the motor above, anyone know if this will fit on the shaft.
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Old May 23, 2008, 12:09 PM
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CANTZ506's Avatar
Brescia, Italy
Joined May 2004
784 Posts
Quote:
Originally Posted by 6-mins
is this a good prop and motor to go in the guppy.
http://www.hobby-lobby.com/speed400.htm - 400speed, says it has a 2.3mm shaft diameter.
https://www.hobbycity.com/hobbycity/...peller_6x4inch - closest thing to the recomended 5X4 for the motor above, anyone know if this will fit on the shaft.
If you read the comments below the propeller's image, (french and spanish) you find the answer: DO NOT BUY IT!
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Old May 24, 2008, 02:30 AM
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Joined Apr 2008
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how bout this, https://www.hobbycity.com/hobbycity/...oy_hub_-_6.5x4
and what do you think of the motor?
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Old May 24, 2008, 05:23 AM
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Brescia, Italy
Joined May 2004
784 Posts
Quote:
Originally Posted by 6-mins
how bout this, https://www.hobbycity.com/hobbycity/...oy_hub_-_6.5x4
and what do you think of the motor?
Sure this 'seems' better, but I can't say nothing about quality.
But I'm not sure about its size: 6.5x4 seems too big for that motor; I'm afraid it will suffer a bit.
It's better to ask people who have already flown Guppy, or READ the whole part#1 thread!
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Old May 24, 2008, 06:19 AM
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Joined Sep 2006
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For Guppy and speed 400 you should use 6 X 3 folding prop. That is the Law
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Old May 24, 2008, 03:28 PM
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Ljubljana Brnik, Slovenia
Joined Sep 2004
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Quote:
Originally Posted by 6-mins
how bout this, https://www.hobbycity.com/hobbycity/...oy_hub_-_6.5x4
and what do you think of the motor?
Compared to Garupner Cam prop, or AeroNaut folder, this HK prop is very thick. Its airfoil is very fat. So he eat a lot of power.

I saw that prop and I think is not suitable.
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Old May 24, 2008, 03:46 PM
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Slovenská republika, Banskobystrický kraj, Banská Bystrica
Joined Jun 2007
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I changed Speed 400 motor with this Turnigy 28-26 1650Kv with 6x3 Graupner prop and 1300 mAh 3S Lipoly and Guppy now flight wonderfully
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Old May 28, 2008, 07:00 AM
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Ljubljana Brnik, Slovenia
Joined Sep 2004
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Hi all!!

I came across an idea, that would be usefull if I made another set of plans for the Guppy.

This Guppy (Mark 2 ) will incorporate all features, that were shown as good options or modifications in the past, as some builders use it while assembly their own Guppies.

Of course, the general outlook of the model will remain the same.

So the newest Guppy will have:

- better airfoil
- thin ply reinforcment members in the fuselage
- middle wing joiner (optional)
- a little bit longer nose part of the fuselage
- front end redesigned for use of brushless motors
- wing optional with or without ailerons
- ply reinforcements at wing dihedral points
- alternative way of controling tail. Pull-pull system with string.
- list of apropriate (and affordable) propulsion systems from UH http://www.hobbycity.com?cda=21131

So much for now from UL-Design Headquarters

Mitja
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Old May 28, 2008, 07:20 AM
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Dallas, TX
Joined Jan 2005
2,169 Posts
100"?

Quote:
Originally Posted by ultralajt
Hi all!!

I came across an idea, that would be usefull if I made another set of plans for the Guppy.

This Guppy (Mark 2 ) will incorporate all features, that were shown as good options or modifications in the past, as some builders use it while assembly their own Guppies.

Of course, the general outlook of the model will remain the same.

So the newest Guppy will have:

- better airfoil
- thin ply reinforcment members in the fuselage
- middle wing joiner (optional)
- a little bit longer nose part of the fuselage
- front end redesigned for use of brushless motors
- wing optional with or without ailerons
- ply reinforcements at wing dihedral points
- alternative way of controling tail. Pull-pull system with string.
- list of apropriate (and affordable) propulsion systems from UH http://www.hobbycity.com?cda=21131

So much for now from UL-Design Headquarters

Mitja
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Old May 28, 2008, 08:56 AM
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Brescia, Italy
Joined May 2004
784 Posts
Quote:
Originally Posted by ultralajt
Hi all!!

I came across an idea, that would be usefull if I made another set of plans for the Guppy.
Very good!

This Guppy (Mark 2 ) will incorporate all features, that were shown as good options or modifications in the past, as some builders use it while assembly their own Guppies.

Of course, the general outlook of the model will remain the same.

So the newest Guppy will have:

- better airfoil Which?
- thin ply reinforcment members in the fuselage
- middle wing joiner (optional) Two pieces wing (hotliner), three pieces (normal)
- a little bit longer nose part of the fuselage
- front end redesigned for use of brushless motors
- wing optional with or without ailerons
- ply reinforcements at wing dihedral points
- alternative way of controling tail. Pull-pull system with string.
- list of apropriate (and affordable) propulsion systems from UH http://www.hobbycity.com?cda=21131

So much for now from UL-Design Headquarters

Mitja
Before you start drawings, may I suggest a 86" wing span (2.2mt)?
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Old May 28, 2008, 08:57 AM
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Australia, VIC, Delacombe
Joined Nov 2003
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Mitja,
Having built the standard Guppy,I look forward to seeing Guppy MK2

3810
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Old May 28, 2008, 02:14 PM
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Joined Feb 2007
22 Posts
Better airfoill...?? MU or difrent
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Last edited by kr3cik; May 29, 2008 at 03:50 AM.
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Old May 28, 2008, 02:40 PM
Gadsden RC Flyers
Jack Stephens's Avatar
Joined Aug 2004
591 Posts
Guppy Wingtip Suggestion

Mitja,

Since you are planning to change your Guppy plan, I would like to show you a change that I made to mine. The Guppy wingtip is a lovely design, but the detailed carving on the front portion of the wingtips (Photo 1) would have been very difficult for me to duplicate.

To make the wingtips easier for me to build, I terminated the spars and D-Box sheeting on a new tip rib, then glued the wingtip block to that. Section MM on the wing plan provides an exact pattern for new tip ribs, requiring only trimming off the ends to match up with the leading and trailing edges. Photo 2 shows the tip plan and Section MM, and Photo 3 shows the new tip rib patterns ready to cut from 1/8” balsa.

Photo 4 shows a tip rib trimmed to length and glued into place, and Photo 5 shows a wingtip block glued on. In Photo 6 the wingtips are rough shaped and rough sanded. I also moved the triangular leading edge gusset back to the spar/tip rib joint.

My version is not as strong as your wingtip design, but this change made the building task much easier for old fingers. The only additional material required was for the two new 1/8” balsa tip ribs.

For what it is worth,

Jack Stephens
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Old May 28, 2008, 04:49 PM
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Bottrop, Germany
Joined May 2008
5 Posts
Thanks for sharing the plans and the Design for that great looking and as it seems to me also great flying plane! I want to build one for a friend of mine. He goes to india for 4 months and I plan to give him the plane when he is back arrived. He flys only foamies at the moment because his opinion is, wooden planes crash through the smallest mistake a pilot can do. I don't know if this sentence was understandable, I'm from Germany. The thing is, he would never buy or build a wooden plane and I want him to fly something 'real', so i must build one for him
My question is: How long will it take for MkII to come? If that would happen soon, of course I would build MkII then. otherwise, if it comes in 4 months, I will have to build the current version.

So long, Björn.

[edit] If there's someone from Germany here, do you know where to get that PU-glue? Never heard of it so far.
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Old May 29, 2008, 01:14 AM
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ultralajt's Avatar
Ljubljana Brnik, Slovenia
Joined Sep 2004
1,246 Posts
AAA!

What a pleasent respont to my newly idea!

Mark 2 will be the same size as original Guppy.

The larger Guppy will be of 100" or 2,54m wingspan...and it will came after Mk2.

Thanks guys for suggestions! I will use them in concern as they proved themself as worth to use.
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