Posts: 21
Joined: 4/11/2006 From: Starkville,
MS, USA Status: offline
After the great success we had with the DL-50's, we decided to try out another of sylvian1975's (Steven) offerings, the HH 100cc twin. This was a collabrative effort between myself and two other club members. We resurrected an old crashed Extra 230. The plane was last flown more than 10 yrs ago and is estimated to be at least 15 yrs old. This plane is very heavily constructed. If the HH could haul this plane with authority, it should be more than enough for any of the current 100cc offerings.
The HH comes with a Walbro carb. Unfortunately, it uses a piece of brass tubing for the fuel rather than a nipple. The fuel line was secured using three pieces of safety wire, so far no problems. The carb has a neat feature for the choke, in addition to the traditional choke arm, there is an additional arm on the other side of the carb. This additional arm engages with the throttle arm and will release when the throttle is increased. The first time we ran the engine, it kicked over choked, I blipped the trottle which unchoked the carb and the engine remained running. The throttle arm is set at an odd angle, it wants to be pulled 45 deg up and back from the engine. We flipped the carb and were able to obtain a satisfactory throttle linkage with ball links and heavy duty nyrod.
The HH uses an anodized case with cast heads. There were several nicks on the case, and the heads were worse. The engine case has 4 legs to which a mounting plate is attached. I like this design, as the plate will be the first thing to bend or break as well as be the easiest to replace. If you buy one of these engines, pay attention and mark how the prop washer lines up with the engine. Ours lined up with the 6 mounting bolts only one way. The supplied prop bolts were not long enough to pass through the hub of our MSC prob. We replaced these we the longer ones, they are the same as the DL50. The HH uses a RCxcel ignition, and because both cylinders fire at the same time it does not matter which ignition wire goes to which cylinder.
Flight Report:
Prop used: MSC 27-10 Fuel: 30:1 petroleum
We were plagued with interference problems and could not get a good range check. We relocated the antenna. No dice. We tried adding a grounding wire as we have on the DLs. No Dice. Finally, out of desperation, we twisted the two ignition wires (from the ignition box to plugs, see pic) three times. Instantly all our problems went away. Unfortunately, this ate up most of the day and we only had time to rough tune the engine. However, during all the starting and stopping involved with establishing a solid range check, the HH proved itself to be a reliable engine. Usually, 3 flips with it choked, and 3 unchoked would have the running. We established a reliable idle of ~1610 rpm with a max of 5330 rpm, transition was decent. Keep in mind this is a very rough tune. We anticipate more performance when we have time to fine tune the engine. We had the engine a bit rich, as it did not peak on the takeoff roll and then picked up once the prop unloaded. A pull to a vertical line confirmed that the engine makes PLENTY of power, the 230 went up and showed no signs of stopping. The plane was put into a spin, but the idle was a bit too low and the engine died. The plane shorted the runway by ~10 feet. This is a resilient engine, hardly any damage. The twin pipes are bent a little bit, as is the mounting plate. Amazingly, the prop was unbroken. We should have it back in the air by midweek and will continue tuning and testing. Results will be posted.
Conclusion:
There are a few imperfections, but are easily overlooked. Performance has been fantastic and promises to improve. Overall, we're impressed; and at roughly half the cost of other 100cc engines, it can't be beat.
Posts: 382
Joined: 10/14/2004 From: Champaign,
IL, USA Status: offline
I am going to add that those rpm numbers were with 30% humidity, 330ft asl, 100+ degrees, with lawn boy ashless. Hopefully we will have it back in the air in a few days, and I can get my chance at the sticks.
Thanks to DoctorWack for taking the time to write the review!
Posts: 158
Joined: 3/24/2003 From: Toms River N.J., NJ, USA Status: online
Sinergy is right, Go to a 27x8 and the engine will wake up. Later you can run the 27x10. We are getting over 6000 with a 27x8 Zoar with a engine with about 3 tanks run through it, and still not leaned out to the max. Our up lines are very good, it pulls like a mule on the verticle. So far we are pleased with the performance of this new version 100 twin. But to soon to start Bragging, better to to humble at this point then to eat crow later. Keep up the good work and keep us informed with your progress.
Posts: 3104
Joined: 5/22/2005 From: Bear,
DE, USA Status: offline
quote:
ORIGINAL: STEVESRCWORLD
do you guy's think that a 26x10 could be used for break-in with no problems?
Judging by the numbers you need a 26x10 or 28x8 to break this in... you dont want an engine of this time spinning low 5ks for break in. Try something a bit narrower than an MSC too.. thats a big paddle to be spinning for breakin.
Posts: 6
Joined: 8/16/2007 From: jackson, TN, USA Status: offline
I own the "new" model lspro100 it is definetly strong and pulls my 1/3 Matt Chapman Cap vertical with authority! However, I can't keep the mufflers on....have lost 2 even though I used red "heat tolerant" locktite on the second set. I have just recieved a new set from Alfonso and am trying to figure out how to SECURE the mufflers. Any suggestions? By the way I am taching 6000 using a 26-8 Zinger prop. engine starts and runs reliably has 2 ten minute flights not "fine tuned" yet running on32:1 oil . I'm looking forward to pushing this engine to its limits. Kevin
Posts: 3104
Joined: 5/22/2005 From: Bear,
DE, USA Status: offline
safety wire them so they cant come out...
6000 on a Zinger?? do yourself a favor and throw that prop out and get a real prop on there Your plane will thank you! Try a Vess 26A or a Xoar 26x10, NX 26x10 Menz 26x10
Posts: 382
Joined: 10/14/2004 From: Champaign,
IL, USA Status: offline
Keep in mind that the temps are well over 100deg, we are running a MSC prop, and it has about 1/5 gal through the engine. Should get some more numbers today.
Posts: 205
Joined: 9/27/2004 From: PAGELAND,
SC, USA Status: offline
ACTUALLY I HAVE A 3W 80 XI THAT WAS $600.00 AND IT TURNS THE SAME PROP AT 6400. I AM INTERESTED IN THIS ENGINE MYSELF BUT I DON'T WANT TO BUY A 100 THAT IS WEAKER THAN A 80CC JUST SO I CAN SAY I HAVE A 100 TWIN. I HOPE THE NUMBERS PICK UP ON IT. I WOULD PURCHASE ONE IF IT TURNS A 27X10 AT 6000 CONSITENTLY. I KNOW THE OTHER 100'S TURN 27X10'S AT 6200-6300. KEEP US INFORMED ON YOUR NUMBERS AND HOW IT RUNS. I ALSO WANT TO KNOW IF THE TUNING CHANGES WHEN YOU FLY INVERTED?
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> HH100T 100cc twin Review 
HH100T 100cc twin Review - 
Your plane will thank you! Try a Vess 26A or a Xoar 26x10, NX 26x10 Menz 26x10
