HoBao Hyper 7.5 RTR reviewed in RRCi - CML Distribution

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ci feature Radio and servos already installed, just add batteries and you are up and running! The main feature of the 7.5 are the beautiful 20 mm threaded shocks… What’s new You have new lightweight aluminium front and rear shock towers. These of course reduce weight, but are in fact most likely stronger than the originals. They have also improved the front top arms, which now feature a slight upward arch improving structural strength. The steering assembly has been changed with the steering plate now replaced with a much smaller bar. This is less likely to bend and removes some clutter from the steering assembly. This system has been lifted from the new Hyper 9 so is certainly a worthy improvement. The servo saver is also new, and the changes make the whole steering assembly feel very smooth with a minimal amount of free play. The huge threaded alloy bodies of the big bore shocks are the most outstanding feature on the 7.5 version. The Hyper 7 has always been popular with those of use that like to bash our models as well as race them so now the Hyper 7.5 has got the shocks to stand up to the abuse you throw at it. These aluminium threaded shocks are extremely good quality and measure in at a rather large 20 mm. If these are not going to sufficiently cushion your landings then I suggest investing in a parachute! If racing is your thing, they will certainly help you get over the increasingly heavily featured ‘air time’ tracks we have here in the UK. You can now attack the jumps more than ever knowing you are more likely to still be in the race after you land. The high downforce rear wing has been taken from the Hyper 8 and has more curves than Kelly Brook; each curve is designed to get the maximum down force from the airflow travelling through it. The bodyshell gets a new brighter paint scheme, so instantly your friends will see you are running the new 7.5 version. I’m glad they lightened it up a little as I always felt the Hyper 7 shell was a little dull. The power plant is the excellent Hyper .21 3-port turbo engine, which provides bags of power and plenty of low-end torque. You won’t need to replace this engine; it really can hold its own with the mid range race engines out there on the market and being a proper .21 capacity it is race legal. Out of the box This model comes ready to run, however you have a few jobs to do before taking it out for a spin. You will need to fit the aerial within its bright coloured tube. Eight AA batteries will be needed for the Futaba built, HoBao branded transmitter and pop four AA batteries in the receiver pack. Better still, you could get a 5-cell 6 V receiver pack as this will give you more power for your servos and make a big difference to steering/braking strength and speed. You have a separate battery holder supplied for the receiver pack, which is designed to hold a flat pack version. You have a couple of cable ties to further secure your batteries. The air filter will need installing as it comes pre-oiled in a sealed bag. This is a nice touch as you get a nice freshly oiled filter to keep the muck out of the engine’s air intake. You will need to fit the …Quality parts will ensure these are a popular choice wing, just a simple job requiring only two screws. Apply any additional decals to the shell you may want, test the radio gear and you are ready to go. I often check new models over as there can sometimes be the odd loose screw etc. but I’m happy to report that my Hyper 7.5 was perfectly built with ample thread lock used throughout. What’s the Hype about For those not over familiar with the Hyper range, here is a run through of the Hyper 7.5. From lifting out of the box the whole model has a quality feel, with nice thick plastic parts made from high quality very durable plastic. The drive train is simple yet proven to be very effective and reliable. You have three conventional 4 bevel diffs, one sitting central with the other two at the front and rear. All diffs are tuneable with the instructions suggesting 5,000 weight oil on the front, 1,000 in the rear and 7,000 in the centre. I would assume the kit comes with this set-up, but there is no way to be certain. The central diff unit housing holds the twin vented brake discs, which can be adjusted to alter the bias to the front or the rear to change the way you enter a corner. Ideally you need more braking to the front or you will create a handbrake effect under strong braking. This is easy to change, although I didn’t need to, as it was fine from the box. The linkages from the servos are nice and straight keeping things nice and efficient. The front and rear ends are both secured to the chassis with metal chassis braces. Both the centre and rear drive is transferred via dog bones, with the front end using CVJ’s to cope with the extra steering duties. The front hubs are made from cast 07/09 WWW.RADIORACECAR.COM 97
HoBao Hyper 7.5 RTR 3-port liner keeps it simple but lacks nothing in terms of power and reliability RIGHT: The superb 3-port Hyper .21 turbo engine provides great drivability and performance throughout the rev range aluminium, nicely made with tight tolerances to reduce slop while improving strength and steering accuracy. The sturdy front and rear suspension has a sway bar fitted, something not always included on entry type models. The 125 cc fuel tank has a built in filter, but also has an external in-line filter fitted so your precious engine only gets to drink the cleanest fuel and not bits of dust or grit that might have found there way into the fuel mixture. HoBao have even included fuel line clips to keep things tidy and away from moving parts. A nice looking Hyper branded tuned pipe is fitted, so your excellent engine gets to sing its heart out and pull every bit of power from the combusted fuel. The front and rear suspension is rock solid, and apart from the front upper arms, unchanged from the previous Hyper 7 model, but why change something that has stood the test of time and taken all sorts of abuse over the years It’s remained hugely popular, because it’s tough! I would have liked to see the radio box access improved perhaps, as the receiver is in a sealed box with four screws holding the lid down, hardly built for a quick access, and you also have to remove the air filter which screws to the top of the box. It’s hardly the end of the world, but frustrating when you are in a rush to change a crystal. One thing you can be certain of with this set-up is that your air filter is going to stay in place, whatever you demand from the buggy. You can see from the action photos, if the air filter had come off here, I would have ruined the engine in minutes. Get the engine running Engine break-in was a pleasure, it truly was. The engine was a little tight, but a few drops of fuel direct to the carb and a slightly loosened glow plug had the engine started in a few pulls of the cord. I held the glow starter in place for 20 seconds as heat got into the engine, then tightened the glow plug and she purred through the whole tank. It takes about 30 minutes per tank and I always idle through a couple more then run the car slowly for a few more tanks just to be sure it is ready to be used to the extent of its abilities. Keep the temps low, keep the shell off and take your time allowing the engine to fully cool between tanks. It won’t be long before you can dial your engine in for speed. The carb settings and idle were just right for getting the engine run-in. Even at these setting you can tell the engine has some grunt. The turbo vein rotates with the crankshaft and ensures a good top end cylinder fill every stroke Thrash test The majority of Hyper 7.5’s will be bought for the odd club race meeting and then spend the rest of the time bring abused over local common land. So rather than track test, I thought I would take the Hyper to its spiritual home. The location has lumps, bumps and jumps, and just about every possible running surface; large grass areas and some sandy patches for a bit of sideways action too. I took it easy while I settled the buggy down and fine tuned the carburettor for full speed runs and my first impressions were good; the kit tyres worked very well, much better than the Hyper 7 tread pattern would have done here, although not as long lasting should you run on tarmac. They got great purchase on the dry sand, chucking plumes into the air. They worked very well on grass, giving controllable steering but 98 WWW.RADIORACECAR.COM 07/09
Page 1: HoBao Hyper 7.5 RTR By COLIN LONG
Page 5: HoBao Hyper 7.5 RTR 125 ml fuel tan

HoBao Hyper 7.5 RTR reviewed in RRCi - CML Distribution

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