Glenn Stevenson Posted September 19, 2020 Share Posted September 19, 2020 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 Quote Link to comment Share on other sites More sharing options...
Robert Welford Posted September 19, 2020 Share Posted September 19, 2020 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 Quote Link to comment Share on other sites More sharing options...
Glenn Stevenson Posted September 19, 2020 Author Share Posted September 19, 2020 Robert The manual doesnt state the distance from firewall. where did you find the measurement? Cheers Glenn Quote Link to comment Share on other sites More sharing options...
Anthony Scott 2 Posted September 19, 2020 Share Posted September 19, 2020 Just measure the depth of the cowl & make an allowance for securing it! Quote Link to comment Share on other sites More sharing options...
Richard Wills 2 Posted September 19, 2020 Share Posted September 19, 2020 175mm Quote Link to comment Share on other sites More sharing options...
Robert Welford Posted September 19, 2020 Share Posted September 19, 2020 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 Quote Link to comment Share on other sites More sharing options...
Tim Flyer Posted September 19, 2020 Share Posted September 19, 2020 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 Quote Link to comment Share on other sites More sharing options...
Tim Flyer Posted September 19, 2020 Share Posted September 19, 2020 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. 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 Quote Link to comment Share on other sites More sharing options...
Robert Welford Posted September 19, 2020 Share Posted September 19, 2020 Would an inverted engine installation work, or does it make the tank position untenable? I have installed my 3W 28i inverted. Quote Link to comment Share on other sites More sharing options...
Tim Flyer Posted September 19, 2020 Share Posted September 19, 2020 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 Quote Link to comment Share on other sites More sharing options...
Glenn Stevenson Posted September 19, 2020 Author Share Posted September 19, 2020 Thanks, I missed the step in the manual, Didyou have to put weight at the back Tim? Glenn Quote Link to comment Share on other sites More sharing options...
Tim Flyer Posted September 24, 2020 Share Posted September 24, 2020 Hi Glenn no I did not need any weight at the back as I installed two tail servos. Quote Link to comment Share on other sites More sharing options...
Nick A Posted September 29, 2020 Share Posted September 29, 2020 I have installed the Laser 180 in my Acrowot XL using 18x8 prop. Great fun Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted October 1, 2020 Share Posted October 1, 2020 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. Quote Link to comment Share on other sites More sharing options...
Gary Spicer 1 Posted October 1, 2020 Share Posted October 1, 2020 Nick, are the mounts you have mounted your Laser 180 with the Radio Active RAA1520? Gary Quote Link to comment Share on other sites More sharing options...
Nick A Posted October 1, 2020 Share Posted October 1, 2020 Hi Gary, yes the mounts are RAA1520, in addition I have used a beech block as a spacer. Nick Quote Link to comment Share on other sites More sharing options...
Gary Spicer 1 Posted October 1, 2020 Share Posted October 1, 2020 Thanks Nick, I have a Laser 155 to power the slightly smaller CF Xtra Wot I am building, so those mounts will do nicely. Quote Link to comment Share on other sites More sharing options...
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