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Delta Foxtrot23/11/2016 12:21:37
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566 forum posts
91 photos

Gary,

I also invested in the magnetic blocks at the LMA show at Cosford last year. I was wondering how they coped when you attached the leading edge sheeting for the lower surface of the wing during your build. Is there enough force to firmly keep the spar clamped down as your raise the sheet up to the ribs for gluing, or did you pin it down.

regards

dave

Gary Vinten 123/11/2016 12:23:04
522 forum posts
326 photos
1 articles

Posted by Bob Cotsford on 23/11/2016 10:49:06:

No Peter, what Gary wants is a piped .90 ducted fan motor turning a 12*12 devil

NOW there is a thought BOB do you have one !!!!!

Gary Vinten 123/11/2016 12:29:26
522 forum posts
326 photos
1 articles
Posted by Delta Foxtrot on 23/11/2016 12:21:37:

Gary,

I also invested in the magnetic blocks at the LMA show at Cosford last year. I was wondering how they coped when you attached the leading edge sheeting for the lower surface of the wing during your build. Is there enough force to firmly keep the spar clamped down as your raise the sheet up to the ribs for gluing, or did you pin it down.

regards

dave

Hi Dave

Yes there is I put the blocks up to the trailing edge the then pushed the blocks onto the sheet and put a weight on the structure to hold it down while it dried . The best thing I have in my tool box for years . I have built the whole model with these no more clunky slec building jugs and a lot less pins

Gary

Gary Vinten 123/11/2016 12:36:42
522 forum posts
326 photos
1 articles
Posted by MattyB on 22/11/2016 23:56:26:

I would need to work out the numbers on ecalc to be sure which I can't do on my phone, but I still wonder how you're getting to 1700W on a 200Kv motor, 6S pack and a 17x10 prop. Are you sure it is not a pitchier prop?

I think you are going to be disappointed with the speed if your prop really does have a 10" pitch. On a fresh pack the max theoretical pitch speed is only ~45 mph; that's a thrust optimised setup more for a Cub or 3D model than a rocket ship! According to Overlander that motor can run an 18x10 on a 10S(!) pack, so a 17x10 is way under propped on 6S. If you are after speed a square or over-square prop would be a good bet; a 16x16 might be in the right ballpark. Even so I do wonder if your Kv is just too low for serious speed on 6S whatever prop you run.

Edited By MattyB on 23/11/2016 00:14:07

Hi Matty

I dont think there is a listing for the overlander motor on ecalc

but iam sure I will get very near to what I want from this motorface 23

Gary

Gary Vinten 123/11/2016 12:38:28
522 forum posts
326 photos
1 articles
Posted by Peter Miller on 23/11/2016 08:27:03:

Nice one Gary. Should be popular.

As for power, fit a .52 FS. Simples.

Thanks Peter

Good to here from you !! hope your well ?

Delta Foxtrot23/11/2016 12:52:22
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566 forum posts
91 photos

So I guess you had the top and bottom spars glued in place and were using the blocks to hold the trailing edge in position and using the weight to keep the lower spar on the plan? Sounds like a good plan.

I was wondering about attaching something to the front face of the blocks to fit snuggly on top of the spars. Scrap 1/4 balsa fitted using double sided tape or ideally an adjustable feature for different size spars, but your idea sounds nice and simple, I will give it a go.

Posted by Gary Vinten 1 on 23/11/2016 12:29:26:

Posted by Delta Foxtrot on 23/11/2016 12:21:37:

Gary,

I also invested in the magnetic blocks at the LMA show at Cosford last year. I was wondering how they coped when you attached the leading edge sheeting for the lower surface of the wing during your build. Is there enough force to firmly keep the spar clamped down as your raise the sheet up to the ribs for gluing, or did you pin it down.

regards

dave

Hi Dave

Yes there is I put the blocks up to the trailing edge the then pushed the blocks onto the sheet and put a weight on the structure to hold it down while it dried . The best thing I have in my tool box for years . I have built the whole model with these no more clunky slec building jugs and a lot less pins

Gary

Gary Vinten 123/11/2016 19:15:49
522 forum posts
326 photos
1 articles
Posted by Delta Foxtrot on 23/11/2016 12:52:22:

So I guess you had the top and bottom spars glued in place and were using the blocks to hold the trailing edge in position and using the weight to keep the lower spar on the plan? Sounds like a good plan.

I was wondering about attaching something to the front face of the blocks to fit snuggly on top of the spars. Scrap 1/4 balsa fitted using double sided tape or ideally an adjustable feature for different size spars, but your idea sounds nice and simple, I will give it a go.

Posted by Gary Vinten 1 on 23/11/2016 12:29:26:

Posted by Delta Foxtrot on 23/11/2016 12:21:37:

Gary,

I also invested in the magnetic blocks at the LMA show at Cosford last year. I was wondering how they coped when you attached the leading edge sheeting for the lower surface of the wing during your build. Is there enough force to firmly keep the spar clamped down as your raise the sheet up to the ribs for gluing, or did you pin it down.

regards

dave

Hi Dave

Yes there is I put the blocks up to the trailing edge the then pushed the blocks onto the sheet and put a weight on the structure to hold it down while it dried . The best thing I have in my tool box for years . I have built the whole model with these no more clunky slec building jugs and a lot less pins

Gary

I got 20 blocks when I got mine so my whole model was made using them all

MattyB24/11/2016 00:08:58
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1908 forum posts
29 photos
Posted by Gary Vinten 1 on 23/11/2016 12:36:42:
Posted by MattyB on 22/11/2016 23:56:26:

I would need to work out the numbers on ecalc to be sure which I can't do on my phone, but I still wonder how you're getting to 1700W on a 200Kv motor, 6S pack and a 17x10 prop. Are you sure it is not a pitchier prop?

I think you are going to be disappointed with the speed if your prop really does have a 10" pitch. On a fresh pack the max theoretical pitch speed is only ~45 mph; that's a thrust optimised setup more for a Cub or 3D model than a rocket ship! According to Overlander that motor can run an 18x10 on a 10S(!) pack, so a 17x10 is way under propped on 6S. If you are after speed a square or over-square prop would be a good bet; a 16x16 might be in the right ballpark. Even so I do wonder if your Kv is just too low for serious speed on 6S whatever prop you run.

Edited By MattyB on 23/11/2016 00:14:07

Hi Matty

I dont think there is a listing for the overlander motor on ecalc

but iam sure I will get very near to what I want from this motorface 23

Gary

ECalc used to allow custom motors in the free version, but looks like they removed that now. The only other free e-calculator I found gave a ridiculous result (max wattage of only about 300 on your setup), so unless I pay for eCalc I guess the theoretical max wattage value will remain a mystery.

Not so the pitch speed though - 200kv on a 6s pack is a max rpm of ~4800, so on a 10" prop you have a max pitch speed of 45mph. Given drag losses you are probably looking at a max airspeed of only 40mph. I wish you luck, but suspect it's going to be like driving on the motorway in first gear on that prop...

Edited By MattyB on 24/11/2016 00:11:51

Gary Vinten 114/12/2016 19:53:09
522 forum posts
326 photos
1 articles

Just a small update on the RIZLA+

20161214_194001.jpgSome riveting to do on the cowl but not far from the finish line yes20161214_193953.jpg

Gary Vinten 106/01/2017 22:30:38
522 forum posts
326 photos
1 articles

Small update on the rizla +

rizla2.jpgrizla.jpg

Delta Foxtrot06/01/2017 23:00:32
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566 forum posts
91 photos
Looking good Gary.
Gary Vinten 119/01/2017 19:37:10
522 forum posts
326 photos
1 articles

OK folks the finish line in site now

20170119_155514.jpg20170119_155443.jpg20170119_155452.jpg

Denis Watkins19/01/2017 21:48:38
3599 forum posts
166 photos

Wow Gary wow. That is a beauty.

Very inspiring

Clean your lens too buddy, that flair in your photos is from a sheen making your lens dirty

MattyB20/01/2017 10:42:07
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1908 forum posts
29 photos

Looks nice. I am intrigued to see how it performs on that very low Kv motor...

Bob Cotsford20/01/2017 10:54:12
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7788 forum posts
432 photos
Posted by MattyB on 20/01/2017 10:42:07:

Looks nice. I am intrigued to see how it performs on that very low Kv motor...

me too! My Curare has a 430kv motor on 6S and happily runs 12*12 or 12*10 props for 6/8 minutes from 4000 mAhr packs and I wouldn't class that as exceptionally fast.

Gary Vinten 120/01/2017 14:50:29
522 forum posts
326 photos
1 articles

Hi All

I now will run the motor on a 8s pack and the prop is 18x16 apc this should give me what I need I ill run some test over the weekend and set out some specs

MattyB20/01/2017 15:36:07
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1908 forum posts
29 photos
Posted by Gary Vinten 1 on 20/01/2017 14:50:29:

Hi All

I now will run the motor on a 8s pack and the prop is 18x16 apc this should give me what I need I ill run some test over the weekend and set out some specs

That sounds more like it - your pitch speed is in the 100mph ballpark on a 16" pitch, 200Kv and 8S. Just be careful not to go too far the other way and burn out your ESC, as you are operating a lot closer to the limits with that setup; maybe try a 17x16" (if such a thing exists) for starters?

 

Edited By MattyB on 20/01/2017 15:37:37

Gary Vinten 120/01/2017 15:43:24
522 forum posts
326 photos
1 articles

Hi MattyB

I have phoned overlander and they say with that setup it should stay in the max amp range of the motor

17x16 prop are around but ill put a watt meter over this setup and see how it goes wink

MattyB20/01/2017 16:54:20
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1908 forum posts
29 photos

It is the ESC I would be more worried about than the motor based on the stats, but if you throttle up slowly whilst monitoring the amps you should be fine.

Edited By MattyB on 20/01/2017 16:58:20

Gary Vinten 126/01/2017 22:07:51
522 forum posts
326 photos
1 articles

Specs for the RIZLA +

Wingspan 59"

Nose to tail 57"

AUW including 2x 4s 4500 lipos 7.9ib

Wing loading 24oz/sq ft

ESC 80amp with built in bec

Watts approx. 1700

All metal gear servos

Tarannis transmitter all telemetry setup

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