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› Raptor 30 V1 Box conversion
01-19-2010 07:35 PM  8 years agoPost 1
liljalepeno

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Dublin, Ireland

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Hi folks,

I have just aquired a TP Packs box conversion for one of my Raptor V1.
(thanks to a very genuie seller on RR !)
It is currently stretched with a 50 boom but runs 550 blades.
I did this so that I could run 600's when it goes in a 50 fuselage later this year.

My question to the forum is, what spec motor should I be looking for if I want to run 6S Lipo packs?

My figures are coming out at around 1100kv based on the fixed gearing and the fact that the box uses a 2:1 reduction gear ratio.

I'd be very greatful for some expert advice !

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01-19-2010 08:01 PM  8 years agoPost 2
Jag72

rrProfessor

South of Boston

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the "Box"
The gear reduction boxes were designed back in the day when there wasn't a huge selection of motor KV choices....

I would ditch that box setup if I were you and go with a direct drive setup.

the box is just another source of weight and potential failure.

BUT...that's just my $.02

I would say to shoot for 1900-2000 rpms though...it's easy to figure out though...

if you go with 1100kv you'll end up with NO headspeed...

I'm assuming you have a 93 or 95t main gear?

pinion is 9 or 10t?

if you have an 1100KV at 6s with a 9th on a 93t main...you'll be looking at like 1000rpm's

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01-20-2010 01:45 AM  8 years agoPost 3
Chuck Bole

rrElite Veteran

Tulsa Ok. U.S.A.

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The Box..
Brings back some memories..

I used a Neu 1515 2y on mine.. 1100 Kv on 10s2p 4200? Tp battery.
using the stock R30 gearing, it was either 85T Main and 10T pinion or 86T Main and 9T pinion.. with the 2:1 ratio on the box it was either 19.1:1 final ratio or 17:1 ratio. Using MrMel's headspeed calc..
86TM 9T pinion:
Voltage for this calculation (avg):3,552/cell with a total of 21,312
Nominal voltage: Spoolup RPM 100% throttle no governor (22,2v): 1285
Avg RPM you will see with 100% throttle and no governor: 1197

Max normal bogging applied you will see RPM at: 1049
(this number should be the minimum if your motor & battery is up for the challenge)

Spoolup with Governor @ 65%: 1078
Spoolup with Governor @ 75%: 1141
Spoolup with Governor @ 85%: 1204

or with
85TM and 10T pinion.
Voltage for this calculation (avg):3,552/cell with a total of 21,312
Nominal voltage: Spoolup RPM 100% throttle no governor (22,2v): 1436
Avg RPM you will see with 100% throttle and no governor: 1337

Max normal bogging applied you will see RPM at: 1172
(this number should be the minimum if your motor & battery is up for the challenge)

Spoolup with Governor @ 65%: 1204
Spoolup with Governor @ 75%: 1275
Spoolup with Governor @ 85%: 1346
Probly want to look for a higher Kv motor depending on what headspeed you want to get.. Mabey this..http://www.espritmodel.com/index.as...ROD&ProdID=4639

Here is a link to MrMel's HS calc..
http://heli.dacsa.net/CalculatorV2/Default.aspx

chuck

Team Synergy Field Representative / Thunder Power

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01-20-2010 01:54 PM  8 years agoPost 4
liljalepeno

rrNovice

Dublin, Ireland

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Thanks for the advice guys !

I am keen to use the Box set up as it keeps the raptor as close to original as possible. I have a TT MD530 body that it is going into shortly, so I want an easy fit.

Given that this is going to be a scale bird, I want a head speed around 1500-1800 max so using MrMel's HS calc, this indicates a motor with 1700 - 2000 KV is the way to go.

I can't get over the price of the Neu motors, obviousley quality but they are a bit beyond the budget I have set for this project.
So looks like I will have to look for a similar spec, lower priced option.

I believe that the Align Trex 600 motor is in this KV range, could that be a option here?

Definatley less expensive but is it up to the job, I am sure the raptor weighs more than thre Trex 600.......

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01-21-2010 12:46 PM  8 years agoPost 5
liljalepeno

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Dublin, Ireland

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Ok so I have done quite a bit of searching on this and I think I understand the math involved, kind of

Jag, thanks for the advice on headspeed you were on the money based on the gearing.

cgbole, thanks for the link to the calculator, makes all the stats and specs and ratios etc. so much more meaningful !

That being said, I still need your advice and guidance please?

Main Gear 85
Pinion 9/10 (have both)
Box 2:1
600 blades/boom

It seems that most people are using motors of 650-800Kv with a direct drive setup on 6S.
With the "box", I should be using double. So thats 1300-1600KV.

By my calculations, this would give me a Headspeed of 1358-1671.
(That factors in coservative losses for motor efficency of 80%)
This seems about right for scale flying.
I got similar numbers from MrMel's HS calc so think I am in thr right ballpark.......famous last words !

Ok so down to motor choice. I have $100-150 to spend.
My choices appear to be:

Scorpion HK4020 1390KV (may need to upgrade bearings to ceramic)
Scorpion HK3026-1600kv (may need to upgrade bearings to ceramic)
Align BL600XL - 1620KV
Align BL600L - 1650KV
Kontronic Tango 45-13 - 1300KV
CENTURY OUTRUNNER 600A PLUS - 1100KV

What do you guys thinks of my calculations and what motor would you choose ?

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01-21-2010 01:34 PM  8 years agoPost 6
Chuck Bole

rrElite Veteran

Tulsa Ok. U.S.A.

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With the Rappys fixed gearing,(non-adjustable mesh) if you change the pinion you have to change the main gear as well.. so you will have to run the 85T with the 10T, or 86T with the 9T. If you would like to try it i have a Align motor 600L i'll send your way. Just PM me a address..
chuck

Team Synergy Field Representative / Thunder Power

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01-21-2010 05:31 PM  8 years agoPost 7
scott s.

rrElite Veteran

Orange, Ca.

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Factory Electric
Why not just buy their factory electric, it`s easier.

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01-21-2010 06:13 PM  8 years agoPost 8
liljalepeno

rrNovice

Dublin, Ireland

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Hi Scott s.
Yeah true it would definatley be easier but I really love the way my bird fly's right now and it's going into a scale body shortly.
If I use the box conversion it means I don't have to strip the heli and re-build. I'm also learning so much through this process so that is a huge bonus !

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01-22-2010 09:33 PM  8 years agoPost 9
liljalepeno

rrNovice

Dublin, Ireland

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Chuck, thanks for the offer, really decent of you but I think I should be sorted for a motor now. Jag has sold me a Hacker that he used to use in his Box Logo. So should be a perfect fit. I'll post pics and some flying once it get's going. I think I'll be the only person to post a Box powered Rappy on youtube, I can't find a single vid of anyone using one !

I'm on to ESC's now as I thought I had something up to the job but on double chekcing the specs, I think I could be pushing it to far.
But that's for another day !

Thanks again guys, I'm really looking forward to completing this conversion

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