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Member postings for Shaun Walsh

Here is a list of all the postings Shaun Walsh has made in our forums. Click on a thread name to jump to the thread.

Thread: Prop advice please.....
29/06/2020 13:26:00
Posted by Shaun Walsh on 29/06/2020 13:24:31:

How about this?

**LINK**

107mm long, 3S, 5.2Ah.

It's 15 C which means you could pull 78 Amps.

I have the 3Ah version and it copes fine with 37 Amp draw.

Just read your previous post, this is too big too!

29/06/2020 13:24:31

How about this?

**LINK**

107mm long, 3S, 5.2Ah.

It's 15 C which means you could pull 78 Amps.

I have the 3Ah version and it copes fine with 37 Amp draw.

29/06/2020 11:45:08
Posted by Roger Dyke on 29/06/2020 10:28:53:

Hi Dennis,

Thanks for the link. Unfortunately my battery length limit is 107mm and if I go to the 4S then the current capacity drops from my 3S 3000mA to 4S 2200mA so will be very little improvement as I will have to reduce the current taken considerably to keep to the approx 5 minute flying time. I think that I have visited nearly all of the battery suppliers and for the space available I think have the best compromise I can get. Thanks for your suggestion though.

If length is the problem, have you got room for two batteries side by side or one above the other wired to the ESC in parallel?

Thread: Spektrum DX9 Setup- Help Needed!
25/06/2020 15:00:04
Posted by Tosh McCaber on 25/06/2020 14:56:23:

Did you manage to have motor controlled on the throttle stick, Shaun? I'm more or less on a "new" setup at present- it's just the swapping over of motor and flaps control I can't find anywhere so far.

Yes, motor on throttle stick.

25/06/2020 14:45:12

It might be easier to start a new model memory using Acro. I have done this on two electric gliders with flaps camber and crow assigned to switches on a DX6.

Thread: Returning after a long time away
13/06/2020 07:47:20

**LINK**

8.1mm thick and £10.99

Thread: Max Thrust Riot versus Wot4
09/06/2020 16:59:52

Can anyone who has removed the metal weight in the nose tell me where the COG was after removal?

Thanks

Thread: Max Thrust Riot - Upgrades
07/06/2020 12:27:53

Has anyone managed to get a Riot to do a proper flat spin, All mine will do is descend rapidly whilst rolling quickly! Gradually moving the COG back and if I try to get more control surface movement I may pull the hinges out!

Thread: Cox 0.49 Aeromodeller magazine ad from the 70`s
07/06/2020 10:55:31

Try here

**LINK**

Thread: Why did the charger stop?
07/06/2020 09:44:28

Is this the battery?

**LINK**

25 Euro plus shipping seems a small price compared to a lost model.

Thread: Sign of the times - funnies
07/06/2020 09:34:15
Posted by FastFlyer Smyth on 06/06/2020 22:06:35:

My mate is a pilot for Virgin Atlantic but, because of the lockdown, he's off work so l asked him if he fancied doing a bit of decorating for me while he's at a loose end and he jumped at the chance.
l must say, he made a lovely job of the landing.

Friend of mine has a light aircraft, I asked him to do some joinery in my loft.

He said he couldn't as he didn't have his instrument rating so couldn't operate a plane above the ceiling.

Thread: Wheels
03/06/2020 12:07:51
Posted by simon barr on 03/06/2020 11:48:22:

I used Timber wheels on mine Slow Poke.

Were they are direct swap Simon?

03/06/2020 11:26:26

Just taken a wheel off and checked weight and dimensions.

4" diameter

4mm axle

25mm hub thickness

34g weight.

Looks like I might be stuck with these wheels, I may have to reinforce the mounting by putting some thin glass cloth on the reverse side.

Thanks for your help everyone.

03/06/2020 10:33:30
Posted by Cuban8 on 03/06/2020 09:49:26:

Dubro Low Bounce wheels are excellent and I use them exclusively on all my models now. The rubber tyres are very effective in damping rebound as their name suggests and also goes a long way in reducing shock loadings on oleos or wire undercarriages. Try dropping a Dubro and a cheap rubber wheel onto a hard surface from a couple of metres, the difference is very marked with the cheapy acting like a 'super ball' but the Dubro's rebound deadened to very little.The heavier the model, the better they work, in my experience.

**LINK**

Other stockists are available of course.

Edited By Cuban8 on 03/06/2020 09:57:24

Thanks for the recommendation but they appear to be available only up to 3.5", not 4".

03/06/2020 09:20:47

I need advice on wheel choice for an HK Slow Poke.

The undercarriage on this model is its weak point, a slightly less than perfect landing means that it has to be dismantled , glued back together and reinstalled.

The 4 inch wheels supplied are quite hard so I thought that replacing them with wheels with more give would help absorb some of the landing shock and keep the mounting intact for longer.

Any suggestions as to a suitable brand/supplier?

Thanks

Thread: Most power i can get from a 6" prop
02/06/2020 14:40:09
Posted by Shaun Walsh on 02/06/2020 14:38:43:
Posted by Christopher Morris 2 on 02/06/2020 13:58:20:

Ah! Thanks, guys, i am typing this again because i clicked one of your kind links & lost my text, lol.

This is all for an experiment on lifting a hovercraft with forcing air down a central 6” tube out to a perimeter of 4” tube with holes underneath behind the skirt & hoping to lift the craft. Forward propulsion for the craft will be a separate thing.
I liked the EDF route but was getting a bit expensive at over a hundred pounds.
Now the other links are helping as i already have some 80amp esc & spare 4s 5amph batteries & it is just getting down to motor & prop.
Am i right in thinking a 6x4 prop is going to drag the most air in? As the very detailed prop chart has confused me in that it looks like its part imperial & part metric ??.

IE: When i get to 6x4 props i can understand this. Then it goes on to 6x42E-3 starting to get confused.
But i am looking to lift about 9ibs/4klg.
At worst, it could be fitted with 2 motors & blades but would like to get away with one. Thanks

The abbreviations can be confusing, 6x4.2 E-3 translates as 6" diameter, 4.2" pitch, Electric 3 blade.

This thread might be of interest.

**LINK**

Have you any idea what the total mass of the hovercraft will be? I don't think that the thrust will need to exceed the mass of the model but have no idea of the relationship between mass, thrust, air volume etc required for effective hovering.

Sorry, just read it's 4Kg.

02/06/2020 14:38:43
Posted by Christopher Morris 2 on 02/06/2020 13:58:20:

Ah! Thanks, guys, i am typing this again because i clicked one of your kind links & lost my text, lol.

This is all for an experiment on lifting a hovercraft with forcing air down a central 6” tube out to a perimeter of 4” tube with holes underneath behind the skirt & hoping to lift the craft. Forward propulsion for the craft will be a separate thing.
I liked the EDF route but was getting a bit expensive at over a hundred pounds.
Now the other links are helping as i already have some 80amp esc & spare 4s 5amph batteries & it is just getting down to motor & prop.
Am i right in thinking a 6x4 prop is going to drag the most air in? As the very detailed prop chart has confused me in that it looks like its part imperial & part metric ??.

IE: When i get to 6x4 props i can understand this. Then it goes on to 6x42E-3 starting to get confused.
But i am looking to lift about 9ibs/4klg.
At worst, it could be fitted with 2 motors & blades but would like to get away with one. Thanks

The abbreviations can be confusing, 6x4.2 E-3 translates as 6" diameter, 4.2" pitch, Electric 3 blade.

This thread might be of interest.

**LINK**

Have you any idea what the total mass of the hovercraft will be? I don't think that the thrust will need to exceed the mass of the model but have no idea of the relationship between mass, thrust, air volume etc required for effective hovering.

02/06/2020 13:05:55

You can see the thrust for APC props here:

**LINK**

02/06/2020 12:45:29

If you definitely want a 6" prop and not an edf:

Rev limit for 6" APC E prop is 150000/6=25000rpm

Assuming a 4s Lipo motor KV needed to achieve 25000 rpm is 25000/14.8=1689Kv

So you are probably looking at something like this

**LINK**

or this

**LINK**

Approx 400watt

If you want an EDF then something like this at 2100W may work

**LINK**

Not sure what the comparison of thrust would be like though.

It all depends upon what you want it for and how big a battery you want to use.

Thread: Hobbyking
28/05/2020 13:51:57

Ordered some Lipo batteries from the UK warehouse and they arrived this morning so i guess they are working again.

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