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Old 12-05-2012, 02:13 PM
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Originally Posted by TimBle View Post
Yeah and its also the most fickle market where if an engine is 50rpm shy of what the manufacturer promised, its Forum time
Yup, it's too bad people measure performance based on RPM's most of the time. If you fly full throttle all the time great, otherwise RPM's really don't tell you much about performance.
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Old 12-05-2012, 06:25 PM
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older than dirt,
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Originally Posted by Monster Energy View Post
Comparing a 60cc engine to a 289cc drone engine back to a quadra engine was funny. Thanks for the laugh. Hahaa.
HA HA HA HA..The post was trying to show that a single bolt hub is better, not comparing any engine, new or old, to modern(?) engines..Single bolt hubs keep props on the engine,multiple bolts do not, whatever the cc size is....
You might try reading the intent of the post, it's not that hard
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Old 12-05-2012, 06:39 PM
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HA HA HA HA..The post was trying to show that a single bolt hub is better, not comparing any engine, new or old, to modern(?) engines..Single bolt hubs keep props on the engine,multiple bolts do not, whatever the cc size is....
You might try reading the intent of the post, it's not that hard
Don't get me wrong, your Probly right. I have never shears bolts off any of my engines. But not too many people buy these engines to do what you guys do to them. It cracks me up how you always have something to say about these engines. The 4 bolts on these 60cc engines are perfectly safe. Never had a problem with mine. If you do, learn how to drill a prop, lol.
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Old 12-05-2012, 07:08 PM
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I like single bolt hubs because they are no fuss to fit a prop from new without the need to drill and you can experiment with different props without making them useless to any other engine that has a dif bolt config. What doesnt work on one engine can be used for a different one. Shearing multi bolt hubs has never been a problem for me but they do make prop choice selection more critical unless you have money to burn on expensive testing and are Ok with having a shelf full of not so good props you wouldnt prefer to use in future on that engine but cant face throwing away.
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Old 12-05-2012, 07:32 PM
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+2 single bolts should be standard
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Old 12-05-2012, 07:59 PM
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I liked seeing the solidworks drawings of these engines. very cool.
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Old 12-05-2012, 08:07 PM
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I like single bolt hubs because they are no fuss to fit a prop from new without the need to drill and you can experiment with different props without making them useless to any other engine that has a dif bolt config. What doesnt work on one engine can be used for a different one. Shearing multi bolt hubs has never been a problem for me but they do make prop choice selection more critical unless you have money to burn on expensive testing and are Ok with having a shelf full of not so good props you wouldnt prefer to use in future on that engine but cant face throwing away.
That's a good point. I can see how that would help save some cash in the long run. I would hope the gp61 will be the same bolt pattern as most 50-60cc engines. Keep it all universal.
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Old 12-05-2012, 08:39 PM
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Its the same as the dle and da..
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Old 12-05-2012, 09:00 PM
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Smart move GP
When you own a few engines and one is an MLD as I do its bastard of a bolt pattern. Nothing comes close so your farked if you picked the wrong prop. Only way I get around it is by buying a wooden prop first and if it proves good buy a carbon next and use the wood as a spare
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Old 12-05-2012, 10:11 PM
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Its the same as the dle and da..
Sweet!! I am excited to see how hard the 61 can swing a 24a and a 24b. At my elevation, we are using a 24a swinging about 6950 rpm. Roughly 4000 ft above the sea. I am impressed with the 88 and 176. Especially the evo. Watching the 37.5 % Yak launch out of a hover like a 100cc is incredible.
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Old 12-06-2012, 12:00 AM
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actuallu Antique is right, single bolt prop hub is much safer. All the props inertia is handled by the interference of the prop against the hub. Any slip just tightens the nut up.
In a mult bolt arrangement, any slip results in the bolts being placed in bending and you can use long column theory to work out if they can fail or not. The threads are also laced under stress will can result in micro cracking so they may not fail on the flight or the next flight but they will eventually. Everytime the you have a prop strike that breaks a prop, you place the prop hub under stress its not designed to cope with. A single bolt prop hub is better at coping with this
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Old 12-06-2012, 12:25 AM
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I am very appreciate everyone here in this thread give me such great suggestion!!!
But the 61 crankshaft was made and it's too late if want to change single bolt!
I will build single bolt hub in my next project maybe GP-35
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Old 12-06-2012, 01:19 AM
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It is your design and your choice. Believe me, if someone wants one of your engines, the bolt pattern is not going to spoil the sale. Great work Fergus, I can't wait for my 123!!
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Old 12-06-2012, 01:31 AM
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It is your design and your choice. Believe me, if someone wants one of your engines, the bolt pattern is not going to spoil the sale. Great work Fergus, I can't wait for my 123!!
Exactly......But I really want to know what people think about it and I will analyze the advantage/shortage than make a choose
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Old 12-06-2012, 05:49 AM
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hmmmmm GP 35, now my ears are wide open!!

Fergus, no worries on the GP61 prop hub, whats done is done , it won;t hurt sales but it would be great if an aftermarket prop hub could be available once the dust settles on all the engines you're releasing. SIngle prop hub is a better engineering solution in this capacity class but having 4 bolts won't slow sales I'm sure
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