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Ripmax Bolero

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John Roberts 1622/11/2017 12:56:21
15 forum posts
1 photos

Steve that sounds a little more encouraging could be the forward CofG is airing on the manufacturers safe and cautious side for first flights. 140mm would be more achievable with much less lead upfront.

Great too hear or see the final product Steve, eg engine size weight and many balancing you needed.

Denis mine has just the one rear mounted elevator servo 55g with the shorter and more positive action push rods.

I did think of fitting a closed loop elevator system to lighten the the tail end. This is still an option just figuring out how to fit it in, the servo bay is a bit tight width wise, without some major rejigging of the existing plates and formers. Must admit I didn’t realise there were different versions out there, unless it’s what others have done themselves to improve.

Just wish the manufacturers had been a little more detailed and descriptive in here manual regarding the IC version of what looks like a great plane, and responded to email help requests.

Every line tells a story, thanks chaps......

Steve Dunne25/11/2017 08:58:24
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168 forum posts
94 photos

Maiden yesterday - hardly any trim needed from take-off! Five excellent flights on a very cold day.

The model weighs 2956 grams (6lb 10oz) with no ballast other than a dastardly pilot (I don't like empty cockpits!). The LiFe battery is stored underneath the fuel tank, everything else positioned as supplied. This gave a cg at 135mm, which seemed perfect in the flight tests. Thanks to Phil for his Bolero experience on this!

The engine is a Saito FS82b, with an APC 14x6 prop. Flies vertically out of sight - all the power it needs.

Presumably due to the thick wing, the model slows up rapidly when power is cut - surprised me on the first few touch & goes, but this makes power-on landings a breeze. Knife-edge flight needed a rudder mix of 8% down elevator, and my first (not very good) tries at prop-hanging indicated no detrimental tendencies. All the staggers were pilot-induced disgust.

This looks like becoming a regular go-to model.

Steve.

John Roberts 1626/11/2017 15:37:51
15 forum posts
1 photos

Steve, thats brilliant news.

Where did you have your elevator servo mounted in the end ? was it tail end or up front ?

Thats quite a rearward CofG, 15mm behind the max recommended rear position.

Guess your club colleagues have the experience with this to model to advise though.

Going to shave some lead of mine now.......push that CofG back a bit at least to the 120- 130 point possibly more.

Thanks for the update, really appreciated.

Steve Dunne26/11/2017 16:17:07
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168 forum posts
94 photos

Hi John,

The elevator was at the back - as per design.

The CG is not as rearward as you think - I always do a calculation from Gordon Whitehead's 1980 book "RC Scale Aircraft", which has several formulae to help scale modellers determine where is a safe, conservative cg for scale designs. The formula gave 125mm for the Bolero, so 135mm to make it more aerobatic was a fair guess. In the air, inverted flight needed just a smidge of push-elevator for level flight...

As I said before, mine is the third Bolero to fly recently at the club, and I suspect that there will be more smiley.

Steve.

Steve Dunne08/02/2018 11:14:09
avatar
168 forum posts
94 photos

As forecast, we are now up to five Boleros, two electric and three glow (all Saito 82).

The plane gets better every time I fly it!

One note - it could do with a bigger tank for the Saito engines...

Steve.

John Roberts 1624/05/2018 14:42:23
15 forum posts
1 photos

Next

At last, got a day with a little more faversble weather but not ideal for the maiden. 12 mph winds gusting 16mph....ASP .52 12x6 prop onboard glow engine running quite nice eventuallly, very touchy needle valve adjustments but appears to run nicely with good tick over and pickup.

Still had the 400grams of lead on the engine mount to get it balancing in the recommended area. Rates setup to give the manufacturers recommended throws on alll surfaces with 30% expo. Side force generators were also fitted for the maiden.

Take off into wind quite straight forward took about 10-15m on 3/4 throttle and up she went. Required quite a lot of up trim to maintain flat level flight ( perhaps all the additional lead up front causing it to nose down, something to consider and try correcting later) plane kept wanting to bank and turn right, initially tried correcting with aileron trim and some rudder left trim. Improved s little but did not maintain the same degree of correction through the whole flight envelope..... need to investigate this. Flew several flat ish circuits seemed to be constantly correcting the left and right roll, very touchy, when looping it seemed to peel of to one side after going over the top, thinking something is not aligned right. or could this be the lead again up front? Or the 12mph wind and effect of the Side force generators?)

First landing, throttle back to idle, head into wind, killed the speed now it really was twitching around left and right vertually on the stall, even with the 12mph headwind. Not a very pleasant experience but down safely.

Second flight was pretty much the same as the first very difficult to keep straight, flat or level and far too twitchy for comfort. Pity Ripmax never replied to my questions about the balance point could have ended up with a better review.

Next flights. Remove the lead in increments, bit wary of doing it too much as the CofG will move back possibly compounding the already unstable twitchy flight characteristics. I need to check again all the flying surfaces the way it screws out of loops and turns / rolls left or right depending on the air speed.

Conclusion so far, the plane looks good, but needs some investigation and tweaking to fly on the rails.

For myself not particularly impressed, doesn’t compare to some other more stabile flying of other similar ilk models. Can understand why there is so little information about it anywhere on web now.

Denis Watkins24/05/2018 15:04:04
4529 forum posts
122 photos
Posted by John Roberts 16 on 24/05/2018 14:42:23:

Next

At last, got a day with a little more faversble weather but not ideal for the maiden. 12 mph winds gusting 16mph....ASP .52 12x6 prop onboard glow engine running quite nice eventuallly, very touchy needle valve adjustments but appears to run nicely with good tick over and pickup.

Touchy needle valve John

Check for tightness every single bolt on a new motor, and that the carb is down on the O ring.

The backplate too. Then tune with the onboard glow switched Off

John Roberts 1625/05/2018 18:04:20
15 forum posts
1 photos

Hi Denis,

Had read a few reports about some engines vibrating apart in flight along with exhaust bolts falling out and exhaust gaskets failing. All my bolts are now thread locked, the carb tube and O ring as well as the high speed needle thread has gasket sealer on also the exhaust gasket removed and sealed with high temp gasket sealer. Found my ASP .52 with 12x5 prop 10% nitro is running quite well now throttles up well and nice low smooth tick over. Only had 5 tanks through it though.

Have removed 50% of the lead from the front end of the Bolero, there’s still an additional 100grams up front and the CofG now just behind the recommended.

Increased Expo to 40% on all flying surfaces and removed the winglets for now, as I’m not sure if when I flew it on the windy maiden day they were impacting on the lateral stability, so going to try without them hopefully on less windy day.

Not giving up yet, will persevere.

John Roberts 1622/10/2018 20:45:39
15 forum posts
1 photos

Success..... at last..... converted to the manufacturers electric specs, wow what difference. Picked up the courage to go for it regardless of the additional weight up front to balance.

WoW what a difference straight level controllable a real delight to fly....happy days.

Flight not to aerobatic more to get the feel of it. Looks really promising. Happy days. Thanks for all the advice guys appreciated. Video below of the test flight with comments.

**LINK**

John Roberts 1624/09/2019 16:01:52
15 forum posts
1 photos

Sunday 22 Sept update on my electric converted Bolero. My first ever Club aerobatic competition, nice and simple, fly the clubman aerobatic schedule as accurately as possible. Guess what ? I won it with the Bolero.....Testament to how good this plane is.

I'm not the best pilot in the club, far from, some are far more experienced and better than myself. However the breezy 12 -16mph wind basically forced me to try the Bolero, rather than one of my other sports type planes.

The Bolero was an absolute dream, easy take off, gradual climb, take off circuit completed into the 2x inside loops, nice and big equal size, then the Immelmann no problem, tons of power great roll out, then the downwind outside loop, completed easily but could haver been more round... Split S again easy for the Bolero then the Cuban 8, no problems here, just getting pushed off line by the wind. next stall turn straight up, back off the power boot full of rudder, nice and straight on the down. Slow roll next , I had practiced this on the simulator using the rudder and elevator to keep level during the roll, the Bolero actually did it so easily gaining full marks on that one. The 1/2 square loop and roll out at the top again no problems, the 2 x spins I miss timed slightly so didn't look as elegant as it should, my fault. The landing circuit and landing into wind was a so graceful and slow fantastic.

Overall I was thoroughly impressed with how this Bolero flies, it goes where you put it, its a good sized plane, easy to see and so stable. Its down to how you fly, your rates and expo settings, om sure it will do the book, I'm not a 3D pilot, perhaps one day with more practice, (much more practice) I'm sure the Bolero is capable of meeting most pilots needs.

So glad I got one now, all my initial worries and concerns over the CofG and extra weight were miss founded.

I now want another, as a back up, but it doesn't appear to be available anywhere.........!!!!!!!!!!

Many UK shops and outlets are advertising it, but always showing Out of stock....!!!!!.

Have Ripmax stopped making it ? Has it become one of those flash in the pan Discontinued model....???

I sincerely hope not ! If any of you know what's happening regarding Bolero stocks I would definitely appreciate an update. No info anywhere, such a pity as its such a fantastic plane. Huge thumbs up for it, we need more of them now....

John Roberts 1610/07/2020 00:00:30
15 forum posts
1 photos

Bolero coral snake.jpg

At last the new Ripmax Bolero is out.

Coral Snake. Looks exactly the same as the original Bolero just a new colour scheme.

Couldn't resist the temptation had to buy one of these too

If the old Bolero was anything to go by the stocks wont last long.

My local model shop had purchased 6 sold 3 of them in the first day.

A superb plane. Will be going electric with this, using the Quantum 55 II as advertised, really packs a punch, great combo.

Edited By John Roberts 16 on 10/07/2020 00:06:54

Edited By John Roberts 16 on 10/07/2020 00:10:06

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