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Acrowot xl

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Glenn Stevenson19/09/2020 12:38:34
58 forum posts
3 photos

Hi, Im putting an acrowot xl together but instead of a petrol engine Ive bought a Laser 180.

Just wondered if anyone else has tried this and has any pics of the engine install,

Not sure how far off the bulkhead the engine needs to go to get the balance good.

Thanks

Glenn

Robert Welford19/09/2020 13:41:08
225 forum posts
4 photos

Hi Glenn,

It will be a great combination. I built one during lock-down, but installed a 3W 28i petrol. I considered using my Laser 180 - the installation of the Laser would have been easier.

I would plan the engine installation to get the prop driver at the specified distance from firewall and worry about the CofG later. It won't be far off - install the batteries accordingly.

I installed 2 low profile Savox servos in the tail to drive the elevators. The CofG came out just right for my style of flying without the need for any lead. It's probably a little behind the recommended position.

Robert

Glenn Stevenson19/09/2020 14:40:45
58 forum posts
3 photos

Robert

The manual doesnt state the distance from firewall. where did you find the measurement?

Cheers

Glenn

Anthony Scott 219/09/2020 15:31:48
108 forum posts
9 photos

Just measure the depth of the cowl & make an allowance for securing it!

Richard Wills 219/09/2020 17:05:23
avatar
258 forum posts
7 photos

175mm

Robert Welford19/09/2020 17:59:01
225 forum posts
4 photos
Posted by Glenn Stevenson on 19/09/2020 14:40:45:

Robert

The manual doesnt state the distance from firewall. where did you find the measurement?

Cheers

Glenn

The Acro Wot XL manual does state the distance as Richard stated 175mm.

STEP 55
Most petrol engines will require the use of stand-offs to position the engine
correctly. The distance from the front of the engine former to the rear of the
spinner should be around 175mm. With the correct length stand-offs to hand
use one of them, complete with threaded insert, to draw the captive nut fully
forward into place in the former, making sure that a large washer is fitted under
the end of the stand-off. Repeat for the three remaining captive nuts.

Edited By Robert Welford on 19/09/2020 18:20:01

Tim Flyer19/09/2020 18:54:03
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1336 forum posts
239 photos

Tried to put a link of my public album but I’m afraid this site isn’t easy for linking albums 🙄. Anyway a few of us have use Laser 180s in Acrowot XLs and it is a great combo ! 

Edited By Tim Flyer on 19/09/2020 19:01:52

Tim Flyer19/09/2020 19:03:58
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1336 forum posts
239 photos

Here is the engine cowl cut out. I laminated a square block of plywood to act as a stand-off for the engine mount . That’s much stronger than using aluminium posts. 7a6ccdd4-1752-4ba0-9636-183cc1e95ffb.jpeg

Edited By Tim Flyer on 19/09/2020 19:06:32

Edited By Tim Flyer on 19/09/2020 19:12:09

Edited By Tim Flyer on 19/09/2020 19:13:15

Robert Welford19/09/2020 19:06:20
225 forum posts
4 photos

Would an inverted engine installation work, or does it make the tank position untenable?

I have installed my 3W 28i inverted.

Tim Flyer19/09/2020 19:10:52
avatar
1336 forum posts
239 photos

Inverted would not work as tank too low. You would also expose a lot of engine outside the cowl and make a vulnerable “ground rake” with any nose over. I have an inverted Laser 200v in a WWXL but the cylinders are shorter being a twin (2x100). To fit the 200 I. I had to split the cowl in half

Glenn Stevenson19/09/2020 22:15:06
58 forum posts
3 photos

Thanks, I missed the step in the manual, Didyou have to put weight at the back Tim?

Glenn

Tim Flyer24/09/2020 14:11:32
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1336 forum posts
239 photos

Hi Glenn no I did not need any weight at the back as I installed two tail servos.

Nick A29/09/2020 20:55:16
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2 forum posts
1 photos

I have installed the Laser 180 in my Acrowot XL using 18x8 prop. Great funsmile0.jpg

Paul Marsh01/10/2020 09:44:41
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4103 forum posts
1234 photos
Posted by Tim Flyer on 24/09/2020 14:11:32:

Hi Glenn no I did not need any weight at the back as I installed two tail servos.

As I did with mine. With a heavy engine, this is good, anyway, both in safety and better control response = no slop.

Gary Spicer 101/10/2020 10:36:07
48 forum posts
3 photos

Nick, are the mounts you have mounted your Laser 180 with the Radio Active RAA1520?

Gary

Nick A01/10/2020 11:04:11
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2 forum posts
1 photos

Hi Gary, yes the mounts are RAA1520, in addition I have used a beech block as a spacer.

Nick

Gary Spicer 101/10/2020 11:55:42
48 forum posts
3 photos

Thanks Nick, I have a Laser 155 to power the slightly smaller CF Xtra Wot I am building, so those mounts will do nicely.

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