John Timmis
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Everything posted by John Timmis
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Hi folks, Well, changing the prop to a 12x6 has reduced the watts to a more reasonable figure. Last Sat the weather was perfect for a first flight, batteries all charged, so all set for a 'Will it or won't it moment?'. What could possibly go wrong? So everything set to go, all psyched up, do a range check.................. NO AILERONS. The plug on the new aileron servo had disintegrated. Ahhhhhhhhhhh Don't know if it was crushed when the wing was put on..... can't think of anything else. Anyway fingers crossed for tomorrow. Cheers John
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Danny, Chris, Thanks for that, I'll give it a try. I also have some 4s 3200 mAh batteries I could try. Depends how they fit & the cg. Cheers John
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That looks great to me. Cheers John
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Hi folks, This is where we are today. Obviously there is still lots that needs to be done but it's in a state where it can be test flown. A few facts & figures before the first fright. The weight has finished up at 7lb 8oz. The build, as far as I can remember because most of it was done years ago, is just as drawn on the plan. I probably changed the undercarriage fixing but no extra washout was built in. The elecric conversion has clearly increased the weight compared to the original Merco 61. However, the cg is spot on with no extra ballast. Servos are all standard size Futaba. The power train components I bought at the Cosford show. The intention was to buy something similar to what was suggested in Danny's earlier post. In the event, having been advised that nobody ever asked for 5s batteries these days, I bought a 6s , 4500 mAh , 30C Dynamic battery. To go with this there was a 70amp speed controller & a 650kv motor rated at 1150w. Also a 14x7 prop. This is clearely much more than is needed but there is always the throttle stick. Having just run this setup through the watt meter, I saw 1.5 kw at full throttle. HELP. I'm at the bottom of the learning curve regarding larger electric models. Any suggestions please. Cheers John.
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Hi folks, I've not posted for a couple of weeks. It's not that I've done nothing but rather that there isn't much to show for it. Everything seems to take twice as long on this model. Before the rudder hinges could be glued the fuselage tail fairing had to be made, fixed in place & covered. That took a while. Then a number of small things to finish off. The CG has been checked, batttery bay finished , servos connected & radio installed. Although still far from finished it is completed to a state where it can be test flown. Just waiting for a suitable day & we can have the first fright. According to my kitchen scales the AUW is 7ld 8oz. Does that sound reasonable? Since I returned to rc about 6yrs ago Ihave only flown elecric models. This is the largest & heaviest so far. Also the first with flaps. Any advice re flaps would be welcome, they are on a switch & are either up or down. Cheers John.
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Hi Danny I know just what you mean. Dennis certainly gave us somethings to think about. The plans are incredibly vague in this area & also,as you say, inaccurate too. The first time I made the fairings I ended up hacking the whole lot off. (I was pretty hacked off myself). The fairings are such a prominent feature they do need to look right. I came back to it after about 3 weeks & had another go, but the whole lot almost went into the bin at this stage. Some sections on the plan would have been a help. Anyway, I think the second attempt was better but I'm still not sure if they are right. It took a lot of eyeballing & comparing photos. Keep up the good work, it's very inspiring." Nil illigitimi carborundum', as the Romans said. Cheers John
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Hi everyone, Might be able to answer the washout question soon. My no 1 chippie, athough far from finished, should be in a flyable state in a week or two. The model was built as per plan, as far as I remember, because 30yrs ago I knew no better. I'll give some weight & power figures before the first fright. Cheers John
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Hi folks, That went well. We have elevators. Should soon have a flyable model Cheers John
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Hi folks, After a break last week, when grandfather duties were carried out , things are moving again. The solartexing is finished & so this afternoon I was able to finally glue the elevator in place. The photo shows a dry run to check the setup. Cling film with a strip of selotape each side is used to keep the epoxy away from the hinges.Rubber bands hold it all together & folds of card ensure there is clearance. The glue is setting now. Will know tonight if it worked ok. Cheers john. .
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Hi Thanks for the comments. It was a great project & good to be involved. If you havn't already done so, visit, '( hydraulicsonline.com). Near the bottom of the home page you will find a link to the whole project story & also a link to the 'heritagecconcorde' site which is packed with more Concord stuff. Cheers John.
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Hi Thanks for the comments. It was a great project & good to be involved. If you havn't already done so, visit, '( hydraulicsonline.com). Near the bottom of the home page you will find a link to the whole project story & also a link to the 'heritagecconcorde' site which is packed with more Concord stuff. Cheers John.
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Thanks, Here are some of the team that made it all happen. It was a great day out & I actually got to sit in the captains seat. I was quite suprised to see just how cramped it is up there in the pointy end. To get into the pilots seat you first have to step over the flight engineers seat, then over the central panel with all the throttles & engine instruments. Once you are in you are completely surrounded by panels of instruments & switches. All the instruments & lighting have recently been brought back to life so it's an impressive sight. As we left the hanger we heard the unmistakable sound of a Merlin. We were treated to an aerobatic display by a Spitfire in the blue Duxford sky. Perfect ending. Apparently the TV cameras were there this morning, so keep an eye on the small screen tonight & you might see a bit more, especially if you are in the East Anglia region. Cheers John.
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Fans of Concorde (& that must be all of us) will be pleased to know that Duxford's Concorde is now once again able to demonstrate ,to the public, one of its many innovative features. It is now the only Concorde in UK able to droop & raise its nose & operate the cockpit visor. Project Salute was announced today by David Cahill At Duxford. Concorde Heritage Group carried out the actual work on Concorde to enable this to happen. About 18 months ago HYDRAULICS on LINE, the company run by my son in law & daughter (Mark & Helen Tonks), was approached by Concorde Heritage to see if they could help with the project. They were delighted to help by providing bespoke equipment & design help & expertise. The results of the collaboration can be seen from today. I was privileged to see see Concorde in action 3 weeks ago when I went to Duxford with Mark to meet some of the team at one of their training days. It was a fascinating day out . This Concorde was the second pre production aircraft. The nose of the aircraft had not been moved since its last landing at Duxford 30 yrs ago. I feel very proud of our family involvement in the project. Please visit hydraulicson line .com for more details of the project, how it was carried put & a link to the Concord heriage site. John
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Hi Danny, This looks very interesting. I was wondering if you had a method to make nice sharp trailing edges. I've just finished solartexing my wings so next job is to assemble the ailerons & flaps to the wing. Do you have a source of small nylock nuts or do we use a thread locking glue on the hinges? I was abit concerned when covering the flaps & ailerons about their lack of torsional rigidity. They seem ok now they are covered but it would have been easy to warp. I expect Dennis used doped tissue on the original model. Cheers John.
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Hi I'm not sure how the Barnstormer was done. Perhaps a pair of 60 degree aileron bell cranks would give some differential. Just a thought. Cheers John.
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Hi folks Danny, here are the photos of the aileron linkage. Hope they make things clear. It seems to work ok. Your wing is looking great. Cheers John.
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