Terry Walters Posted May 30, 2011 Share Posted May 30, 2011 Just a quick and rough adding up of all the parts of my ongoing WOT 4 assembly - including a 2820 motor and a 3000mah 3S Lipo comes to approx 1.8kg (nearly 4lbs!!) That's without trying to balance it at the COG. Nothing added that shouldn't be there! Worrying? Yep it is isn't it!! Have no idea yet how it will balance so that could be even heavier! Will plod but will it fly like the foamie - not a chance! TW Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted May 31, 2011 Share Posted May 31, 2011 A friend has one (balsa electric version) and he commented on the weight of the thing when I was chatting the other day. I don't think he's flown it yet. I've just added it to the review section so folks can leave a review when they're ready. Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted May 31, 2011 Share Posted May 31, 2011 Posted by Steve Hargreaves on 30/05/2011 09:29:56: Re: Davids comments on the Acrowot......seems my LMS is "in the know" too... See here Seems to be a foam version though.....I was hoping for a balsa ARTF like the Wot4 ARTFAh well I might have to get one of the ARTB versions...... I'm not in the 'know' on this one Steve but it seems a pretty logical and commercial step to introduce all the Foss stuff as ARTF. Quote Link to comment Share on other sites More sharing options...
Kevin J Lloyd Posted May 31, 2011 Share Posted May 31, 2011 My mistake its not over 1kg of lead but just over 200 grams but its still a lot of lead !Edited By Kevin J Lloyd on 31/05/2011 08:27:27 Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted May 31, 2011 Share Posted May 31, 2011 Recommended noseweight for a WOT4Edited By Martin Harris on 31/05/2011 09:13:23 Quote Link to comment Share on other sites More sharing options...
Kevin J Lloyd Posted May 31, 2011 Share Posted May 31, 2011 Having just spoken to Customer Service at Ripmax a few minutes ago I have been told and quote "The manual has a misprint of the recommended C of G for the Wot 4-E (Balsa Version) which is 90mm from the leading edge and not 70mm and will require approximately 90grams of lead to balance it", with this I will take it out to my local flying club today and report back later with the results. Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted May 31, 2011 Share Posted May 31, 2011 Martin the best thing you can do with that is one of the following: 1. Donate it to a museum 2. Melt it down and use it for stick on weights. 3. Keep it safe and when your grandchildren ask " Grandad what is an IC engine?" you will be able to show them. 4. Use it as a holding down weight on your first leccy build - it will happen! Made me laugh tho'!Kevin - well done - do we believe them? Why does the manual refer to -"may require weight" Hmmmmm!? Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted May 31, 2011 Share Posted May 31, 2011 Terry I have a much better idea ! Send the "nose weight" to me Actually I have my version of a Wot4 on the drawing board based on info from forumites and photos that I started sometime ago & that " nose weight" would be better than my SC 52 .Edited By Myron Beaumont on 31/05/2011 10:08:21 Quote Link to comment Share on other sites More sharing options...
David Davis Posted May 31, 2011 Share Posted May 31, 2011 Why not try one of those really unusual Almost Ready to Glue versions? They're really great! You can make sure that all of the components are properly glued together and you get to choose your own colour scheme! Chris Foss'll sell you one! Quote Link to comment Share on other sites More sharing options...
Allan Bowker Posted May 31, 2011 Share Posted May 31, 2011 On paper the WOT4-E sounded better than my Foam-E, however after reading this thread, it brings back too many memories of my own dealings with Ripmax and their v1 model releases. I will stick to my Foam-E and my MKII IC WOT's Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted May 31, 2011 Share Posted May 31, 2011 Posted by Kevin J Lloyd on 31/05/2011 08:27:07:My mistake its not over 1kg of lead but just over 200 grams but its still a lot of lead !Edited By Kevin J Lloyd on 31/05/2011 08:27:27 Er, thats a lot less than kilogram though. Quote Link to comment Share on other sites More sharing options...
Simon B Posted May 31, 2011 Share Posted May 31, 2011 I think it's unbelievable that Ripmax are shipping it and advising it needs lead in the nose. I can think of few models where the manafacturer recommends that much dead weight. I think i'll be avoiding buying one of these... Quote Link to comment Share on other sites More sharing options...
Kevin J Lloyd Posted May 31, 2011 Share Posted May 31, 2011 Well I have just got back from my local club with the Wot 4-E intact, after initial trimming it coped well with the wind at 15mph (gusting 20mph) although it tended to drfit a little in the gusts but overall performance I am quite pleased with, getting it to land was a little tricky as just when I thought it was going to touch the wind took it up a few feet and it took me several attempts to get it to land, the weather in the NW looks to be calmer on Friday so will definately be giving it another go. Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted May 31, 2011 Share Posted May 31, 2011 Well done Kevin! Any sign of the COG being too far back? Do you think that 90mm is right.. Is there hope for us after all? TW Quote Link to comment Share on other sites More sharing options...
NigelH Posted May 31, 2011 Author Share Posted May 31, 2011 Given the windy conditions it seems like it actually went pretty well. In fact, lighter models would have been struggling in that wind Quote Link to comment Share on other sites More sharing options...
Kevin J Lloyd Posted May 31, 2011 Share Posted May 31, 2011 I didn't want to mention it before but I visited the Aircraft Proving Ground website which can be found at http://www.geistware.com/rcmodeling/index.htm , although its an American site it provides a lot of usefull information for us RC modellers, one particular page is a C of G calculator and can be found at http://www.geistware.com/rcmodeling/cg_super_calc.htm , I inputted the required measurements of the Wot 4-E and it gave me a C of G of 82mm, so I guess Ripmax's 90mm was far off but it does seen to fly ok at 90mm, when I next have a bit more time to play with I will alter the C of G to 82mm and of course add a bit more lead and see how she performs. Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted June 9, 2011 Share Posted June 9, 2011 Well - just got back from a short break and got on with my WOT 4 E Mk2 balsa. Looks great! But..............the AUW with a 3000 mah lipo is just under 4lbs (when the 'required' 90gms of weight is added) and I make the wing loading about 19oz per square foot!! The ARTF is built as per the instructions, This cannot be anywhere near the intention when this ARTF was conceived. It will fly like a brick unless it can defy the laws of aeronautics. Even if the revised balance point suggested by Ripmax is correct the model is still fundamentally flawed in its specifications and probably dangerous (especially in my hands!) If my wing loading calculation is right then this puts the WOT4 way way out of line with its design use - it has the wing loading of a high end racer at best and almost double what it should be for a sports aero. With the suggested power unit it is difficult to see how it can perform as per it's stated specification. I really don't know if I want to fly it and wouldn't suggest anyone rushes out to buy one until it becomes a 'Mk3' and has undergone serious lightening surgical work. It is built like a an IC model than an electric version. TW Quote Link to comment Share on other sites More sharing options...
Pete B Posted June 9, 2011 Share Posted June 9, 2011 That's it - I'm dusting off my NATO helmet for the next session with Terry!!! Pete Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted June 9, 2011 Share Posted June 9, 2011 Just pm'd you Pete. TW Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted July 5, 2011 Share Posted July 5, 2011 Well - just has a gorgeous blue sky day at my club here in France with Pete B who has maidened 4 planes for me today including my Wot4 Mk2 Balsa! It weighed in at 4lbs 2 oz with a 3S 2300 Lipo - whew!!! See pic! But what a surprise - it turned out to be quite a pussycat after all! After PB had settled it down for me I was able to get 2 lipos worth of flying and only broke a prop!! I really thought it would be more like a lead sled and am still supplied how much of a floater it was! Here's the proof:- TW Quote Link to comment Share on other sites More sharing options...
Ben B Posted July 5, 2011 Share Posted July 5, 2011 Wow, that's quite a lot of church roof! Tempting to put a bigger flight pack in instead. Still, if it flies.... Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted July 5, 2011 Share Posted July 5, 2011 Posted by Ben B on 05/07/2011 19:32:05:Wow, that's quite a lot of church roof! Tempting to put a bigger flight pack in instead. Still, if it flies.... I agree Ben but I couldn't get a larger pack in! Got a 60amp ESC and the 2300 lipo only just fits TW Quote Link to comment Share on other sites More sharing options...
Kevin J Lloyd Posted July 5, 2011 Share Posted July 5, 2011 My Wot4-E has completed almost 4 hours of flying most of which I have enjoyed but on Monday 4 July it met its demise just after take off at around 6 to 8 feet it suddenly went into a right hand inverted roll and crashed breaking its back, upon closer examination to find out the cause of this I found that one of the metal clevis's at the rudder had parted company with the pin which was still stuck in the nylon arm that attaches to rudder, I think I may be able to get away with a repair but I will reinforce it with fiber glass sheet on the inside. Quote Link to comment Share on other sites More sharing options...
Terry Walters Posted July 6, 2011 Share Posted July 6, 2011 Oh Kevin! Really sorry - I gave my a good check over yesterday before flying especially as I had to alter both clevises to reset the rudder when we put it on my mates tx for the maiden.Still cant get over how it flew on such a short span wing with so much 'cargo' on board! Keep us posted with the rebuild - more weight aft of the COG you don't really need. TW Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted July 6, 2011 Share Posted July 6, 2011 19 oz/sq.ft isn't really that high for an aerobatic model you know. My Eros must be around 18oz/sq.ft and that's a big floaty thing despite it's 7 1/2lb all up weight. A little weight can be an advantage when you want to land on a blustery day. Quote Link to comment Share on other sites More sharing options...
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