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Grumpy Tiger Cub by John.

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john stones 106/12/2017 17:03:25
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9680 forum posts
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Built as plan for me, electric version. Sports model finish or made to look military ? I don't know yet.

Probably need help with the choice of motor etc, all the lecky stuff I've built flys well but I'm always disappointed with the flight times, 10 minutes + would be nice.

First twin, so new for me, like the lines of it and the wing section, looks a good un. yes

McG 696906/12/2017 17:41:15
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2176 forum posts
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Certainly looks a good un, John.

I'm struggling myself with EP specs at the moment, but I'm sure some gurus will show you the way.

I guess AUW and ground / fuselage clearance for your props will be the dictating factors here. angel

Subscribed, young man.

Cheers

Chris

Tim Ballinger07/12/2017 12:16:54
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197 photos

Interesting comment John, I get 10 mins with my Skywriter set up using a 3300 mAh battery . I never fly to more than 80% capacity and it is generally more like 70% unless I tear round the sky a bit !

So my very limited experience with electric set up says go for the largest capacity battery you can fit .

Remains to be seen what endurance I get from the Tigercub but again I went for the biggest I could fit which was a 3700 mAh. Many will say that spending money on a premium battery is better value as they hold their voltage for longer and for same wattage requirement use less amps and therefore flight time is better.

That was certainly the advice I got from George at 4 max and I having got one of his LiPo’s I have not been dissapointed.

Tim

john stones 108/12/2017 22:06:29
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9680 forum posts
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I don't think it's the gear I'm using Tim, more like it's me not choosing the correct package.

Flown in a scale like manner, lovely, what a sound. face 1

Ron Gray08/12/2017 22:53:20
924 forum posts
231 photos

And this

**LINK**

john stones 108/12/2017 23:07:00
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Magic, scale colours are growing on me. rainbow

Peter Miller09/12/2017 08:31:16
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Awesome!!!

Tim Ballinger13/12/2017 09:49:43
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430 forum posts
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I think I want smoke too now !

john stones 115/12/2017 17:07:06
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9680 forum posts
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Daft question alert. wink

How do you do radio set up for twin lecky models ? Y lead for esc's or separate channels ?

Tim Ballinger15/12/2017 18:32:21
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430 forum posts
197 photos

John,

Y lead into normal throttle channel. Perceived wisdom is to remove the red power lead (= cut one of the esc wires) from one of the esc’s. This supposedly stops any duality of which esc drives the UBEC power.

The 4 max website has some excellent how to pages if you want more detail/options.

Tim

Ace15/12/2017 19:54:44
203 forum posts
14 photos

I know "cut " was a figure of speech but for clarity, just lift the plastic tab and remove the red wire from one esc plug and tape it back. You can then replace it later and use the esc as normal in another model enlightened

john stones 115/12/2017 21:06:19
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9680 forum posts
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Cheers lads, I'll have a read of 4max threads thanks Tim.

Lucas Hofman17/12/2017 10:00:53
595 forum posts
316 photos
Posted by john stones 1 on 15/12/2017 17:07:06:

Daft question alert. wink

How do you do radio set up for twin lecky models ? Y lead for esc's or separate channels ?

 

Go for a separate channel if you have one on the receiver (and if you have the knowledge to program a mix on your transmitter). This gives you the following possibilities:

  • ​compensate for any differences between the ESC's and motors (starting point, max RPM etc.)
  • turn off one motor and do a low pass with one propeller stopped (you have to program the ESC to stop the propeller so it will not freewheel)
  • Mix rudder to motors. Manouvrer on the ground like a full size does, i.e. pulling more with one motor pulling more then the other for turns.

Regards, Lucas

ps and indeed never use the BEC from 2 ESC's. Some with burn with "feeded" with another power source.

Edited By Lucas Hofman on 17/12/2017 10:01:39

john stones 102/01/2018 18:23:59
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9680 forum posts
1435 photos

Made an hi tec start on mine, trace the parts out, nowt to show you, so few pics of Sonny.a grumpy 001.jpgsonny 1 002.jpgsonny 1 010.jpgsonny 1 013.jpg

Tim Ballinger02/01/2018 20:46:00
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430 forum posts
197 photos

Lovely dog 🐕 you have there.

McG 696902/01/2018 21:00:30
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2176 forum posts
911 photos

... for sure not a 'tiger'... not even a 'cat'...

... but indeed a great companion you have there, John. yes

Cheers

Chris

Edited By McG 6969 on 02/01/2018 21:01:37

FastFlyer Smyth02/01/2018 21:22:40
302 forum posts
10 photos

GSD or cross ? unusual colouring....

john stones 102/01/2018 21:44:26
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9680 forum posts
1435 photos

GSDX, rescue dog, fell in love at first sight. heart confident/friendly/daft.

Ron Gray02/01/2018 22:52:05
924 forum posts
231 photos

You or the dog John, or both?

john stones 102/01/2018 23:11:27
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9680 forum posts
1435 photos

Both I hope Ron, We've both big ears/ nose as well. wink

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