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The SP models will disappoint if propellers with less than 10 inch are employed due to their gearedoutputs which halve the output RPM (whilst doubling the torque) over conventional model aeroengines (ie half the RPM = twice the torque = twice the pitch required)We recommend APC propellers (& other glass composite props) finding these to be both efficientand quiet. RCV carry stocks of these in suitable sizes should you have difficulty obtaining the correctpropeller from you local dealer. As an approximate guide, your SP should be fitted with propellersthat rotate between 5000 and 6000 RPM whilst the 58 CD and the 91 CD run most efficientlybetween 9000 and 13000 RPM. Propellers should be employed that load the engines to these speeds.Three and four bladed propellers will need to bereduced in size by approximately one inch ineither pitch or diameter per blade increase. One ofthe great benefits of the SP series engines is thatthey pull large scale like 3 & 4-bladed props.We have extensively tested the SP range on threeand four bladed propellers and can supply suitablesizes or offer suggested fitments.16x10 3-bladed prop on RCV60SPWooden Props – RCV don’t recommend the use of wooden propellers as quality and weight candiffer significantly. In generally wooden props are much lighter than glass composite propellers andso do not give the desired flywheel effect. This can result in increased vibration on the SP seriesengines. Saying this however, many of our customers have used wooden propellers successfully.Zinger Propellers seem to work well with our engines.Starting a the new engineNew engines will be very tight and may on occasion prove reluctant to turn sufficiently briskly withsome less powerful starters. New 15 and 20cc units will need a fairly powerful starter initiallyalthough once broken in, frictional resistance will be greatly reduced which makes starterperformance less demanding. Ensure that your starter leads are sufficiently robust and that yourbattery is capable of delivering the amperage needed to turn the engine at a reasonable speed forstarting. Corroded or very small battery connectors allied to long lightweight leads will almostcertainly cause your engine to rotate too slowly to start.The SP series requires your starter to rotateclockwise, meaning that the leads will be reversedfrom convention due to their geared output shaftswhich reverses the direction of the drive. Finally,some power panels are rather less than capable ofsupplying sufficient current to maintain a goodglow whilst driving a powerful startersimultaneously and for that reason we advocate aseparate glow battery.Starting the SP engine from behind the propdPhoto User Guide Issue 1 – 2005This is an additional support guide and should only be used in conjunction with the RCV user manual provided with the engine
Behind the propeller starting is potentially thesafest method for any model engine operation andwith the SP range this is strongly advised.Study the photographs paying particular attentionto the reversal of the battery leads on your starter.This is necessary due to the gearing which reversesthe propeller direction on these models.If starting from behind the propeller,remember to reverse the leads!!Running InRunning in your new RCV is simple if a few basic rules are followed. These are not RCV rules perse; but rather rules for running in any engine.1 Ensure that your engine is securely mounted, having previously gone over every fixing onthe unit and in particular the carburetor screws & muffler, ensuring that these are tight. Donot overtighten anything, but do ensure that nothing is about to drop off or loosen. Likeany other production engineered product, human error may well throw up the odd fixingthat hasn’t been fully tightened and checking before running is therefore a sensibleprecaution.2 On the CD series do not open up the engine mounting holes. This can weaken the enginecrankcase so is not recommended.3 We strongly advocate familiarisation in a test stand environment, but should you decide tofit your engine directly into the model, this will suffice for the purpose of running in theCD series, providing that you run a few tanks of fuel through on the ground first. Break intimes vary with most engines needing one to three hours of accumulated time beforegiving their best. The SP models tend to need more time than the CD models, particularlythe 120 which has a lot of large components to bed in. During the run-in period vibrationmay be higher so it is best carried out on a test stand.4 All RCV engines are run prior to dispatch, therefore carb settings will be pretty much set.Running your new engine for the first time should be executed in relatively short bursts –say 3 to 5 minutes with a measurable period of cooling between runs. Set the needle richand run the engine initially on about half throttle which will allow things to bed in nicely.After half an hour of accumulated time run the engine for short full power bursts, but stillon a slightly rich setting, gradually increasing the workload of the unit until it feels“snappy” and it will hold peak RPM without sagging. At this juncture you can attend tothe low speed mixture setting. If adjustment is needed it should only require a ¼ turneither way. There is little point in trying to adjust this initially with a tight engine.dPhoto User Guide Issue 1 – 2005This is an additional support guide and should only be used in conjunction with the RCV user manual provided with the engine
Page 2 and 3: Nitromethane (Nitro)Fuel containing
Page 6 and 7: Adjusting the main needleAdjusting
Page 8 and 9: On Board Glow SystemsOn board glow
Page 10 and 11: Mounting your engineThe SP range pr
Page 12 and 13: For those that feel confident enoug

Thank you for purchasing an RCV model engine. The RCV engine ...

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