Tony Nijhuis
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Posts posted by Tony Nijhuis
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The modified single fan version......
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So Roy, the answer is both!!!!......after the success of the twin fan version, i modified the single fan version and flew this yesterday and it went great.....
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Hi Alan,
Happy new year to one and all....
Test flew this one at Headcorn as I needed the launching arm of Andy Boxall.....Have just retested the smaller single fan version with tailerons and a reduced thrust pipe diameter at the outlet and....SUCCESS
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So the single fan version wasnt a success in terms of speed and performance but it was such a stable and lovely model to fly......sooooo stable. So I decided to increase the size by 30% and fit a second 50mm edf fan (side by side)....and SUCCESS!!!
Decide to make this one with built up wing and use Tailerons for simplicity. So two 3S FMS fans and operating from a single 4S 4000mah 30C lipo... AUW at the moment 2 1/4 lbs. Easy to hand launch too
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So the new twin fan TSR2 has been finally tested......
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I’m sure Kev will organise another flyin next year👍
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Great to know the mini jets are being considered for this years mass build......now i have to give a little credit to David Ashby on this one as two years ago, he did come up with the mini jet idea.....and the rest is history....so thanks David
Also think the idea of making your own choice is a great idea as it will swell the number of interested parties. The great thing about the mass build it will hopefully share the amazing aeromodelling tallent of you guys with newbies and hopefully push the boundaries of the design concept. I do hope that participates will 'do there own thing' with the new EDF power units coming along.
So at the moment you have 6 models to choose from and all of them use the same setup in terms of EDF and battery so there is no losers or winners when it comes to cost or performance.
There will be a couple more next year (EE Lightning & BAC Hawk) so hopefully there will be enough to choose from....
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Good Job Steve & Dave.......
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Steve,
I found all the small sticker on ebay...they come as a sheet....and yes the reg is from the Vulcan......could be bothered to cut a set of bespoke reg numbers...lol
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The build article will be done nearer the time of publication in the RCME.....the Build photos you can download from the web site are far far more helpful
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No Andy.....its planned for next year anyway........I unfortunately crashed it a couple of weeks ago....my fault... doing a farmborough pass flat out at zero feet and caught a wing tip.....considering the speed, i was surprised how little damage there was
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Hi Marc, I wouldn't have suggested 3S if it wasn't sufficient!....adding a 4S fan will obviously improving things
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Thanks Keith....model is almost constructed.....so i'll soon let you know if the wing i have design works!
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Thanks Keith.....most interesting
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Ok so put the wings on, cut a 40 x 40 hole and go and fly it.......
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Colin
Try putting the nose of the model on the kitchen scales.....switch them on and they will zero with the weight of the model on them....then give it WOT with just lateraily supporting the model
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Colin,
I find it unexplainable why this model dose not fly.....If you telling us you measure the thrust of the model at worst being 350g which is 14oz, against an AUW of 21oz you have a 67% thrust to weight ratio which is ample......My sabre flew on a 50% thrust to weight ratio using the cheap AEO fan!
I can only suggest the 40mm x 40mm cheat opening in the underside. Also check your speed controller is giving max output....it is a 40amp controller i assume?
All the latest designs i have produced use the FMS50mm 3s fan and the AUW range from 22oz to 26oz!!!
one last and curious point, did you know you used the Mig canopy on your Sabre!!!!
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Learjet!......not on my list.....
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keep an eye out on our web site Michel.....the release date is early September so not long now... We are having to modify some of our standard electric retracts from Lander, which has not been easy but it now done
100m strip is fine, some of the early testing was done on a much smaller strip
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Colin,
Firstly the 600g is a guideline as to a 'manufactures stated thrust' which is always in 'open field testing' on a test rig. When buying a fan, you only have the manufactures stated thrust to 'BUY' to!. Im saying that a fan unit with a manufactures stated thrust of 600g, in a model such as the Sabre, will fly it very well indeed. It would be ridiculous to expect modeller to test the thrust of an EDF in there own model and then compare that to a specification....
I know from 'open field' test on a rig the FMS 50mm fan on 3S (11.1V) you will get around 620g or thereabouts. However, put this into model and that figure WILL be reduced due to air flow resistance both in front of the fan and losses after the fan....You could easily lose 50% of your thrust but the model will still fly....why???? because i used a rubbish AEO fan in the test Sabre, that could only muster 380g in free air (and probably 150g once in the model) and that still flew!!!
So if your getting 350g in the model, tested......it will go like a rocket!!!!!!!!!!!!!!!!!!!
Having now developed a further six more jets, the secret is a cheat hole (40mm x 40mm or equiv. CSA) in the under side of the fuselage just 15mm or so in front of the fan and this will UNLOCK the performance of fan. The Sabre side scoops would then be redundant.....
30C Lipos are fine....1800 to 2200mah...perfect......anything more may add thrust but this will be offset against the weight increase.......
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The A10 will be some time off and will be two size....a 44" span for 2x50mm fans...hand launch and 55" span for 2x70mm with retracts....both using the FMS 4S fans
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It was sooo easy to design, i couldnt not do it.......here's another just designed
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Well there has been 8 mini jets to date, 2 in last years RCME special, 1 in the next issue of RCME and 5 more to come over the next year in RCM&E......so is that the end...?????.....well not quite......
Here's the final offering and yet another indulgence for me....the TSR2 on a single 50mm EDF...wings are a little stretched buy hey, let see what happens
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Glad you got there in the end Marc.....the little FMS fans don't disappoint
New EDF Mini Jets- Hawk & Lightning
in Tony Nijhuis plan builders
Posted
Well it took 6 months to rebuild (not because i'm slow
) but retested the EE Lightning yesterday having removed the complicated Aileron control and reverting to tailerons......a much easier servo installation and simple to set up......the results were it still had great althourity but the full roll was much slower.....mind you that's no bad thing as the aileron version was a little too rapid on the roll.....