Great product, good instructions

I was very excited and restless to take delivery of this beauty. However, when it arrived and opened, I found that the box the engine was in had damage and signs of packing failure. The mailing box showed no signs of damage. My hrart sank when I discovered that the tiny, scale sized wingnut that secures the air filter cover eas all bent up. I reported this damage two weeks ago and am still awaiting the final word as to when I will receive this damaged piece. I am hopeful Engines DIY will make good as they say they will. Question remains, when? I will append this review, once I have gotten the damaged part, but until thst time, three starz only. Other than that, it truly is an amazing piece of work to behold.

This is a basic entry-level RC helicopter, good for beginners. The handheld remote is easy to understand after reading the instructions. The helicopter’s design is simple, and it comes with spare rotor blades, which is a nice bonus.

The left stick on the controller controls throttle and collective pitch, while the right stick is for cyclic pitch. However, the right stick doesn’t fully translate to accurate flight control—the helicopter mostly hovers and spins slowly unless the right stick is constantly adjusted. The tail rotor only kicks in during certain maneuvers, which limits directional control.

Overall, it’s a decent starter model for someone new to RC helicopters and works well as a learning tool before investing in more advanced models.

Side note: The rechargeable battery takes about 45 minutes to 1 hour to fully charge. It lasts around 10 minutes at full throttle, or about 15–20 minutes at moderate or idle throttle.

Built the small-scale Trent 900 model jet engine in about 1.5 hours. Instructions were in another language, but I followed the pictures and had no issues. The engine is very durable, runs smoothly, and works even better with a little multipurpose aerosol spray lubricant. Looks and functions very realistically—great model overall.

Side note: The two main bearings are a little stubborn to fit into the FWD and AFT sections. I recommend using any household or garage lubricant to help slide them into place easier.

This is my 2nd purchase of the wood base and fuel tank for the HM-01. High quality and good construction. Highly recommend.

Received this engine several weeks ago and wanted to run the engine several times before writing this review. While the engine looks fantastic and is made from high quality engineered components, it's let down by a number of design issues which means it will never run properly. The cylinders are too large and encased in a big block of aluminium that draws all the heat out of the steam, consequently the boiler is simply too small to run this engine properly. The water level tube on the boiler is made of frosted plastic and impossible to see the water level. The burner is an open cup that you fill with methylated spirits and ignite, it has no handle so once it's burning you can't remove it from the engine if you need to extinguish it in a hurry. The burner flares up from time to time and you can have a 15cm flame shooting out the top of the flue. I actually find the burner to be quite scary to use and consider it to be dangerous! It takes two refills of the burner to get the boiler and the large metal engine warmed up, and a third refill to get the engine running. While the engine then runs smoothly, it doesn't run for long and doesn't have much power.

I feel like this product hasn't been developed properly and none of the design flaws corrected before it was released for sale.

If you're looking for a static display model then this engine does look impressive. However if you're looking for a working model engine then I would suggest looing at something else.

Very nice engine model, easy to build and precisely reflects the real motor. Parts precision is impressive and fit is amazing. Instructions are simple yet comprehensive.
I own now 3 Teching Jets, turobofan, fighter turboshaft and heli turboshaft. All excellent. Hope there will be a turbo prop.

I was looking really forward to the new Retrol - Okmo 185 miniature engine to be released and couldn’t wait to order it from EngineDiy.com! I ordered it and it was at my doorstep in 5 days. It arrived packed very safely in a beautifully decorated box, that shows that Okmo & Retrol are proud of this engine… packed in a ‘bulletproof’ foam core specially designed for the 185 engine that assured its safe arrival - no matter how it was handled during the trip from China to me here jn the USA. To me, it really says a lot when a company puts a lot of time and effort into their presentation and packaging… definitely impressed!

I chose the pulley drive version of the 185 for a couple reasons; the poly version gives the owner the choice to start the engine from the PTO pulley, or the rear starting clutch shaft. The pulley version includes two stainless starting shafts for each starting location.

The 185 arrives completely assembled and ready for fuel and three AA batteries that provide power to the mechanical ignition trigger switch, something that I thought was really cool to see on a model engine. Typically our model engines have a hall effect sensor, or a reed switch to trigger the CDI to fire the spark plug. The 185 uses a mechanical switch to trigger the spark, which is a very reliable design that doesn’t burn out.

For fuel I chose to use Coleman camping fuel, with a very small amount of marvel mystery oil for for the break-in period. I premixed my fuel & Marvel oil at around 60:1 which will give the engine a little additional lubrication while the piston ring seat during break in - run in period.
The engine has a very unique and complex oiling system that utilizes a gear type oil pump to pump oil through the crankshaft, the connecting rod and out the wrist pin to ensure lubrication of the piston. Oil also travels up the copper pipes and drops from the valve cover down to the camshaft and tappets ensuring cam lubrication. The piston has a true oil scraper ring that allows the engine to run very clean and not burn oil. i gotta give Mr. Jin big applause here 👏

I filled the crankcase with 6ml of 4 stroke 10W30 oil, installed 3 AA batteries, filled the tank with fuel and was ready to start.

* since this engine has a mechanical ignition switch, it’s absolutely important to make sure the 3 AA batteries are NEW for proper ignition. I initially used three AA batteries that I thought were new and strong and it caused the engine to be very difficult to start and run erraticly. Installing three brand new batteries made the engine start immediately and run perfectly *

I chose to start my engine using the pulley side starting shaft. Starting the 185 from the pulley side requires the cordless drill to be rotated COUNTERCLOCKWISE, where if you use the other starting shaft which is located at the back of the engine, the drill needs to rotate CLOCKWISE.

During my first run of my 185 I ran the engine at 1/2 throttle, positioned a fan to blow directly into the flywheel air inlet, which helped to keep the engine a little cooler during the running in period. The 185 engine likes a bit of throttle when starting, positioning the throttle lever at right at half throttle and a quick finger over the carb air inlet to choke and the engine starts immediately. Right out of the box. It is a very stable and well running machine. I only had to adjust the high-speed needle to richen the fuel mixture and my engine ran solid through the first tank of fuel.

The exhaust sound on the 185 is fantastic! it has a very powerful bark and all through the RPM range. It sounds amazing! I noticed the engine starts and runs even better after 2 full tanks of fuel, and I was able to slightly lean out the mixture which helps to make the engine more responsive to throttle input and low rpm runs.

I am thrilled with my 185 and looking forward to running a centrifugal water pump from the pulley drive soon. The engine has a lot of useable power can tell by the construction that it’s definitely built to last and perform.

OKMO & Retrol have done a phenomenal job in all aspects of their 185. The complex oiling system alone deserves a lot of recognition because it’s not common on many model engines today.

Mr. Jin the 185’s designer & engineer has really raised the standard with his OKMO Model company and looking forward to what he and Retrol creates in the future!!

The Okmo - Retrol 185 is an absolutely fantastic engine that I am very, very proud to own in my collection!

Got my motor approximately two or three days ago and I assembled it already put it all together and it is very high-quality and I look forward to building more motors!

The engine looks great and all the parts seem pretty good quality. There were some fairly difficult steps when a few parts were difficult to put together but the end product looks nice.

Everything spins freely but the 3V DC motor does not work at all when the power is turned on. Maybe I received a defective motor but I cannot find a customer service number to try calling for a replacement and most likely will need to purchase one separately, which is an unfortunate issue to experience when I spent a lot of money on this item. Initially the motor seems to want to spin but immediately stops.

For any prospective buyers just keep that in mind that this may not work as intended due to a non-working part and an inability to talk with a customer service rep.

I had to wait a bit longer than expected, it got here on the 17th of June and the box was a bit beat up. Everything is working perfectly because it was so well packed.
Thanks enginediy

Engine arrived in germany within 10 days. The engine is beautifully crafted and painted and ran
immediately on lighter fluid and a little two-stroke oil. The cooling pump is quite powerful, so I made
a cover for it to prevent splashing. Unfortunately, I didn't tighten the ground cable screw, so the CDI
module broke twice. It would have been nice if this screw had been included. A battery box is also
required.

Overall, a great engine with a nice sound. The exhaust I 3D-printed reduces the noise by 90%.

Chegou muito rápido no Brasil! Lacrado e muito bem embalado, muito satisfeito com a compra, agilidade da EngineDIY , recomendo a todos e desejo comprar novamente. 100% satisfeito

I loved assembling the beam steam engine kit . Everything went together well . I wish there was a bit more builder assembly rather than some pre-assembled parts but otherwise fantastic.

Hello, First I like to congratulate the desighn and manufacturing departments for there fantastic job. My kit is a work in progress but till now everything is going very well. The pastic parts do need a little adjustment but nothing serious. I added also a photo of my Radial 5 cylinder engine and my V8 engine. The turbofan is my favorite because I also worked on them in real life.
Thank you and hope to see more of this.

Willem

Had some difficulty in certain areas.

When assembled according to the directions the shaft would not rotate...0.020" shims between the combustion chamber assembly and the low pressure turbine assembly solved the problem. The atomizer and illuminated tailpipe assembly gave GREAT visual effect. Not as trouble free as my other 3 EngineDIY kits but well worth the extra effort!

This is very well done, excellent quality, and was fun assembling.

I have read the reviews and noticed that they could not get their H76 running. Mine started very easily after I played around a little with the carburetor. Once you get it set right, it starts every time. I like this engine a lot and it has been a great addition to my collection.

Years ago I saw an original three wheeled autocarriage and fell in love with the engine. Now, several years later, I found this working model of that engine and it is a gorgeous piece of engineering and workmanship. Although I have yet to run this engine, I am admiring its fit and finish, both are first rate and the tolerances are very good with little to no slop in the bearings and shafts. I may replace the Red high tension lead with a more vintage looking cloth covered lead and eliminate the sparkplug boot in favor of a brass clip arrangement. I am going to eliminate one of the batteries in the pack so as to lessen the load on the ignition pack. I really am enamored with this model and am really looking forward to put fuel and oil to use. I am even considering the purchase of a second one in the brass finish so that I can add my own color to the assemblies.

Great replacement hose for my Hit and Miss engines. Good color too.

I have done buisness with Enginediy.com many times, it has always been a pleasure, and there cs has always done right by me. This engine is looking very nice and promesing, I can't wait to put it togheter.

I recently bought a Semto ST-NF2. It's a sensational product, the level of simulation, the fact that it's a real engine, the price not very high. Along with the engine, I bought Semto's official base and ignition kit, which worked perfectly. Everything arrived right, great construction, there was a time that I had to get in touch with Engine Diy support and it was very helpful. To those who are undecided whether or not to buy this engine, I definitely recommend it.

Received the engine today...came quickly and was well wrapped/protected. The model came in 2 pieces...1 the actual fully assembled engine, and the other piece was the assembled base/stand. Once the 2 pieces were connected (via quick disconnect point on the engine pylon and on the stand) the model looked fantastic! When it was plugged in via included USB-C cord, and turned on, the lights were all functional (blue for the cold air bypass, red for the exhaust, and white coming through the stage 1 fan blades) and the throttle and Thrust Reverser selections were smooth and responsive.
All in all, I am very pleased with the engine model and its functions. Will definitely be looking at buying other jet engine models from EngineDIY again.

The engine I received had rubber bushings to hold the rockers on and they kept flying off during running and caused some overheating and led to damage but the ltd I ordered is an absolute champion has been going for 12 days continuesly with only stopping once a day for a minute or less been posting on TikTok https://www.tiktok.com/@playboiser?_t=ZT-8vjk93PkDb4&_r=1