Envelope-to: craig@dapaero.com
Delivery-date: Thu, 04 Aug 2022 22:07:21 -0500
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From: DAP AERO <craig@dapaero.com>
Mime-Version: 1.0 (1.0)
Subject: Re: arm offset
Message-Id: <40B4C290-AF63-4447-B33C-AD5D424E67A4@dapaero.com>
References: <fbfd44f6-7b19-44bf-c485-b2415909db7d@nctv.com>
In-Reply-To: <fbfd44f6-7b19-44bf-c485-b2415909db7d@nctv.com>
To: Curtis Andrews <andrewscc@nctv.com>
Date: Thu, 4 Aug 2022 20:07:19 -0700

The +/- extremes can be made even by adjusting the push rod

I need dimensions of your drive gear

I was hoping that by stopping the video the reason for the little arm would b=
e more obvious=20

> On Aug 4, 2022, at 8:00 PM, Curtis Andrews <andrewscc@nctv.com> wrote:
>=20
> =EF=BB=BFit appears from the model that the rocker arm is steeper at the b=
ottom of the stroke, which is not right, as the stroke must match above and b=
elow center line.
>=20
> If you connect the rod to the rocker arm at the arm with no offset, is the=
 movement equal?  IF not, then that must be the reason for the offset.
>=20
>=20
> if the crank was directly under the connection on the rocker arm, then it w=
ould be equal, since my crank is only half of the horizontal distance from t=
he rocker pivot, one would think i would need less of the leg on the offset.=

>=20
>=20
>> On 8/3/22 8:35 pm, DAP AERO wrote:
>> Will draw tomorrow to try and catch up
>>=20
>>>> On Aug 3, 2022, at 7:59 PM, Curtis Andrews <andrewscc@nctv.com> wrote:
>>>=20
>>> =EF=BB=BFQuestion, where is best location for connecting rod to connect t=
o pump bar?
>>>=20
>>> attached are two original documents
>>>=20
>>> I have scaled 10" horizontal and 4" vertically
>>>=20
>>> found drawings of 9"Hor and 5 Vert  and  8" Hor and 7 vert
>>>=20
>>> but using chain and sprocket and not gears, the relationship between cra=
nk and bar  is not the same as the originals.
>>>=20
>>> people are 1.5" taller, but fatter, and we are not going miles so needs t=
o be easier for short distances.    120 years ago, four men could produce .6=
 HP  today, four men can produce .4 HP  so needs to be 1/3 eaisier.
>>>=20
>>>=20
>>> building generally a Sheffield #2 car but 16" wheels. 12" stroke was sta=
ndard, but i can shorten if better.
>>>=20
>>> --=20
>>> Thank You
>>>=20
>>> Curtis Andrews
>>> 1336 E Oak St
>>> Othello WA. 99344
>>> andrewscc@aol.com
>>> 509 346 8108
>=20
> --=20
> Thank You
>=20
> Curtis Andrews
> 1336 E Oak St
> Othello WA. 99344
> andrewscc@aol.com
> 509 346 8108
>=20